Lunar Reconnaissance OrbiterCosmic Ray Telescope for the Effects of Radiation

CRaTER Experiment Data Recordand Archive Volume

Software Interface Specification

Document 32–01211Revision 01

April 6, 2007

Prepared by

Peter G. FordMIT Kavli Institute

Cambridge, MA 02139, USA

Steven P. JoyUniversity of California

Los Angeles, CA 90095-1567, USA

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Lunar Reconnaissance OrbiterCosmic Ray Telescope for the Effects of Radiation

CRaTER Experiment Data Recordand Archive Volume

Software Interface Specification

Release 01April 6, 2007

Approved:

Harlan Spence DateCRaTER Principal Investigator

Stan Scott DateLRO Data Engineer

Raymond Walker DatePDS PPI Node Manager

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Table of Contents

1 Preface....................................................................................................................................11.1 Distribution list.............................................................................................................11.2 Document change log ...................................................................................................11.3 TBD items....................................................................................................................11.4 Abbreviations ...............................................................................................................21.5 Glossary .......................................................................................................................3

2 Introduction ............................................................................................................................42.1 SIS content overview....................................................................................................42.2 CRaTER scientific overview ........................................................................................42.2.1 Scientific objectives ...............................................................................................................52.2.2 Radiation ................................................................................................................................5

2.3 Product types................................................................................................................62.3.1 Experiment Data Record........................................................................................................7

2.4 Scope of this document.................................................................................................72.5 Applicable Documents .................................................................................................82.6 Audience ......................................................................................................................8

3 Archive volume generation....................................................................................................93.1 Data transfer methods and delivery schedule ................................................................93.2 Data validation ........................................................................................................... 103.3 Data product and archive volume size estimates ......................................................... 103.4 Backups and duplicates .............................................................................................. 113.5 Labeling and identification ......................................................................................... 12

4 Archive volume contents .....................................................................................................134.1 Root directory ............................................................................................................ 134.2 BROWSE directory.................................................................................................... 144.3 CATALOG directory.................................................................................................. 144.4 DATA directory ......................................................................................................... 154.4.1 Contents................................................................................................................................154.4.2 Subdirectory structure ..........................................................................................................154.4.3 Required files .......................................................................................................................154.4.4 The yyyy/yyyyddd subdirectory ....................................................................................16

4.5 DOCUMENT directory .............................................................................................. 164.6 EXTRAS directory ..................................................................................................... 174.7 INDEX directory ........................................................................................................ 174.8 LABEL directory........................................................................................................ 184.9 SOFTWARE directory ............................................................................................... 18

5 Archive volume format........................................................................................................195.1 Disk format ................................................................................................................ 195.2 File formats ................................................................................................................ 195.2.1 Document files .....................................................................................................................195.2.2 Tabular files..........................................................................................................................195.2.3 PDS labels ............................................................................................................................20

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5.2.4 Catalog files..........................................................................................................................215.2.5 Index files.............................................................................................................................215.2.6 EDR data files ......................................................................................................................22

6 Support staff and cognizant persons ....................................................................................25

7 Appendix A. PDS label files................................................................................................267.1 Primary Science Data Label File................................................................................. 267.2 Secondary Science Data Label File............................................................................. 277.3 Housekeeping Data Label File.................................................................................... 287.4 Data record formats .................................................................................................... 297.4.1 LRO 64-byte EDR Binary Header Record..........................................................................297.4.2 CCSDS Primary Record Header..........................................................................................307.4.3 CRaTER EDR Secondary Record Header ..........................................................................317.4.4 CRaTER EDR Primary Science Record..............................................................................337.4.5 CRaTER EDR Secondary Science Record..........................................................................337.4.6 CRaTER EDR Housekeeping Record .................................................................................37

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List of Figures

Figure 1: Duplication and dissemination of CRaTER EDR archive volumes .............................11

Figure 2: Archive volume directory structure ............................................................................13

List of TablesTable 1: Distribution list .............................................................................................................1Table 2: Document change log....................................................................................................1

Table 3: List of TBD items .........................................................................................................1Table 4: Abbreviations and their meaning ...................................................................................2

Table 5: Instrument characteristics ..............................................................................................4Table 6: Product types.................................................................................................................6

Table 7: EDR data products ........................................................................................................7Table 8: Data delivery schedule ..................................................................................................9

Table 9: Data product size and archive volume production rate .................................................10Table 10: Root directory contents..............................................................................................13

Table 11: BROWSE directory contents .....................................................................................14Table 12: CATALOG directory contents...................................................................................14

Table 13: DATA directory contents ..........................................................................................15Table 14: DATA/yyyy/yyyyddd directory contents ...................................................................16

Table 15: DOCUMENT directory contents ...............................................................................16Table 16: INDEX directory contents .........................................................................................17

Table 17: LABEL directory contents.........................................................................................18Table 18: SOFTWARE directory contents ................................................................................18

Table 19: Format of index files .................................................................................................21Table 20: Format of LRO file header records ............................................................................22

Table 21: Format of CRaTER Primary Science Data file records ..............................................22Table 22: Format of CRaTER Secondary Science Data file records...........................................22

Table 23: Format of CRaTER Housekeeping Data file records..................................................23Table 24: Format of CCSDS Primary Header structure .............................................................24

Table 25: Format of CRaTER Secondary Header structure........................................................24Table 26: Archive collection support staff.................................................................................25

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1 PrefaceThis document describes the format and content of the Lunar Reconnaissance Orbiter (LRO)Cosmic Ray Telescope for the Effects of Radiation (CRaTER) Experiment Data Record archive.

1.1 Distribution list

Table 1: Distribution listName Organization Email

Charles Acton JPL/PDS/NAIF Charles.Acton@jpl.nasa.govArlin Bartels GSFC/LRO Arlin.Bartels@nasa.govDavid Bradford BU/CAS bradford@bu.eduRick Foster MIT/MKI rickf@space.mit.eduRobert Goeke MIT/MKI goeke@space.mit.eduNicholas Gross BU/Astro gross@bu.eduSteve Johnson JSC/SRAG asjohnso@ems.jsc.nasa.govSteve Joy UCLA/PDS/PPI sjoy@igpp.ucla.eduJustin Kasper MIT/MKI jck@space.mit.eduWilliam Mayer MIT/MKI wfm@space.mit.eduRichard Saylor GSFC/LRO Richard.Saylor@gsfc.nasa.govStanley R. Scott GSFC/LRO Stanley.R.Scott@nasa.govHarlan Spence BU/Astro spence@bu.eduRay Walker UCLA/PDS/PPI rwalker@igpp.ucla.edu

1.2 Document change log

Table 2: Document change logChange Date Affected portion

Initial draft 03/31/07 All

1.3 TBD itemsTable 3 lists items that are not yet finalized.

Table 3: List of TBD itemsItem Section(s) Page(s)

Names of NAIF-supplied products Table 7, Table 14 7, 16Reference to E&PO plan Section 2.5 8PDS volume set ID and label Section 3.5 12Source of mission catalog file Table 12 14Origin of time counters in LRO file headers Table 20 22

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1.4 Abbreviations

Table 4: Abbreviations and their meaningAbbreviation Meaning

ASCII American Standard Code for Information InterchangeBU Boston UniversityCAS College of Arts and Sciences (BU)CD-ROM Compact Disc – Read-Only MemoryCK C-matrix Kernel (NAIF orientation data)CRaTER Cosmic Ray Telescope for the Effects of Radiation (LRO)CRC Cyclic Redundancy CheckDNA Deoxyribonucleic AcidDVD Digital Versatile DiscDVD-R DVD - Recordable mediaE&PO Educational and Public OutreachEDR Experiment Data RecordFOV Field of ViewFTP File Transfer ProtocolGB Gigabyte(s)GCR Galactic Cosmic RayGSFC Goddard Space Flight CenterHK HousekeepingHTML Hypertext Markup LanguageICD Interface Control DocumentISO International Standards OrganizationJPL Jet Propulsion LaboratoryJSC Johnson Spaceflight CenterLET Lineal Energy TransportLRO Lunar Reconnaissance OrbiterMB Megabyte(s)MIT Massachusetts Institute of TechnologyMKI MIT Kavli Institute for Astrophysics and Space ResearchMOC (Missions Operations Center (GSFC, LRO)NAIF Navigation and Ancillary Information Facility (JPL)NASA National Aeronautical and Space AdministrationNSSDC National Space Science Data CenterODL Object Description LanguagePCK Planetary Cartographic and Physical Constants Kernel (NAIF)PDS Planetary Data SystemPPI Planetary Plasma Interactions Node (PDS)SCET Spacecraft Event TimeSCLK Spacecraft Clock

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Abbreviation Meaning

SIS Software Interface SpecificationSPE Solar Particle EventSPICE Spacecraft, Planet, Instrument, C-matrix, and Events (NAIF data format)SPK SPICE (ephemeris) Kernel (NAIF)SRAG Space Radiation Analysis Group (JSC)TBC To Be ConfirmedTBD To Be DeterminedTEP Tissue Equivalent Plastic

1.5 GlossaryArchive – An archive consists of one or more data sets along with all the documentation and

ancillary information needed to understand and use the data. An archive is a logical constructindependent of the medium on which it is stored.

Archive Volume – A volume is a unit of media on which data products are stored; for example,one DVD-R. An archive volume is a volume containing all or part of an archive; that is, dataproducts plus documentation and ancillary files.

Archive Volume Set – When an archive spans multiple volumes, they are called an archivevolume set. Usually the documentation and some ancillary files are repeated on each volumeof the set, so that a single volume can be used alone.

Catalog Information – High-level descriptive information about a data set (e.g. missiondescription, spacecraft description, instrument description), expressed in Object DescriptionLanguage (ODL), which is suitable for loading into a PDS catalog.

Data Product – A labeled grouping of data resulting from a scientific observation, usuallystored in one file. A product label identifies, describes, and defines the structure of the data.An example of a data product is a planetary image, a spectral table, or a time series table.

Data Set – A data set is an accumulation of data products together with supporting documenta-tion and ancillary files.

Experiment Data Record – An accumulation of raw output data from a science instrument, inchronological order, with duplicate records removed, together with supporting documentationand ancillary files.

Standard Data Product – A data product generated in a predefined way using well-understoodprocedures, processed in “pipeline” fashion. Data products that are generated in a non-stan-dard way are sometimes called special data products.

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2 Introduction

2.1 SIS content overviewThis software interface specification (SIS) describes the format, content, and generation of theCRaTER experiment data record archive volumes. Section 0 describes the procedure for transfer-ring data products to archive media. Section 4 describes the structure of the archive volumes andthe contents of each file. Section 5 describes the file formats used on the archive volumes.Finally, Section 6 lists the individuals responsible for generating the archive volumes.

2.2 CRaTER scientific overviewThe investigation hardware consists of a single, integrated sensor and electronics box with sim-ple electronic and mechanical interfaces to the LRO spacecraft. The CRaTER sensor front-enddesign is based on standard stacked-detector, cosmic ray telescope systems that have been flownfor decades, using detectors developed for other NASA flight programs. The analog electronicsdesign is virtually identical to the robust and flight-proven design of the NASA/POLAR ImagingProton Spectrometer that has been operating flawlessly on orbit since 1996. The digital process-ing unit is a simple and straightforward design also based on similar instruments with excellentspaceflight heritage. No new technology developments or supporting research are required forthe final design, fabrication, and operation of this instrument.

The CRaTER telescope consists of six ion-implanted silicon detectors, mounted on detectorboards, and separated by pieces of tissue-equivalent plastic, hereinafter referred to as TEP. Allsix of the silicon detectors are 2 cm in diameter. Detectors 1, 3, and 5 are 140µm thick; theothers are 1000µm thick. TEP (such as A-150 manufactured by Standard Imaging) simulates softbody tissue (muscle) and has been used for both ground-based as well as space-based (i.e., SpaceStation) experiments.

Table 5: Instrument characteristicsLow LET detectors 9.6 cm2 circular, 1000 microns thick. 0.2 MeV thresholdHigh LET detectors 9.6 cm2 circular, 140 microns thick. 2 MeV thresholdTEP absorber 1 5.4 cm cylinderTEP absorber 2 2.7 cm cylinderZenith FOV 35 degrees, 6-detector coincidenceNadir FOV 75 degrees, for D3D4D5D6 coincidenceGeometry factor 0.1 cm2 sr (D1D2 events)LET range 0.2 - 7 MeV/micron (Si)Incident particle energy range >20 MeV (H)_>87 MeV/nucleon (Fe)

Solid state detectors use semi-conducting crystals (in CRaTER’s case, silicon) with n-type (elec-tron-rich, electron conducting) and p-type (electron-deficient, hole conducting) sectors.When a reversed bias voltage is applied at the p-type side, the unbonded electrons in the semi-conductor are pushed away from the voltage source, while the holes are pulled towards it. Thisleaves a neutral area void of charge and current at the junction of the sectors, called the depletionregion. As incoming radiation (e.g., a solar proton or cosmic ray particle) collides with thedepletion region, electron-hole pairs are formed in the material (where a once bonded electron is

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freed from its atom, leaving a hole). The electron and the hole respond to the applied voltage,and a small current is created. This current can be detected and later analyzed.

A cold environment greatly reduces the transmission of thermal signals. In addition, the solidstate of the semiconducting material makes it easier to detect those signals attributable to freedelectrons.Tissue equivalent plastic (or TEP) is a plastic recipe designed to simulate human tissue. Itincludes hydrogen and nitrogen percentages-by-composition that are similar to that found inhuman skin and muscle. Scientists can use the atomic-level effects that radiation has on the TEPto deduce what sort of similar effects may occur in humans.

2.2.1 Scientific objectivesThe primary goal of CRaTER is to characterize the global lunar radiation environment and itsbiological impacts. This objective is critical if we are to implement a sustained, safe, and afford-able human and robotic program to search for evidence of life, understand the history of the solarsystem, and prepare for future human exploration, a vision established by the Presidential SpaceExploration Policy Directive in 2004.In order to achieve this high-priority objective, the CRaTER investigation team established thefollowing interrelated investigation goals:• Measure and characterize that aspect of the deep space radiation environment, LET spectra of

galactic and solar cosmic rays (particularly above 10 MeV), most critically important to theengineering and modeling communities to assure safe, long-term, human presence in space.

• Develop a novel instrument, steeped in flight heritage, that is simple, compact, and compara-tively low-cost, but with a sufficiently large geometric factor needed to measure LET spectraand its time variation, globally, in the lunar orbit.

• Investigate the effects of shielding by measuring LET spectra behind different amounts andtypes of areal density, including tissue-equivalent plastic.

• Test models of radiation effects and shielding by verifying/validating model predictions ofLET spectra with LRO measurements, using high-quality GCR and SPE spectra availablecontemporaneously on ongoing/planned NASA.

2.2.2 RadiationRadiation has a potential effect on a wide variety of life. Beginning with the ionization of atomsand resulting in eventual cell damage, radiation may impact higher-level biological functions.The most critical damage is that which occurs in the DNA of cells.

At the molecular level, there are four possible effects that radiation may have on humans.The first group of effects has no negative consequences for higher-level biological functions.Either cells remain undamaged by the radiation (in this case, the ionization of materials in thecell may produce chemical reactions which occur normally in the cell) or cells may be damaged,but not irreparably so. Often, even damage to chromosomes may occur with few long-termeffects because the cell is able to detect and repair a limited amount of damage. Even withoutradiation dosage, changes and repairs in cells, including chromosomes, occur constantly in ourbodies.

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The second group of effects is more critical and will most likely have a negative impact onhigher-level biological functions. Cells may be damaged and either begin operating abnormallyor die. If enough damage is done and a cell is unable to completely repair itself, it may performfurther functions abnormally, including reproduction. This usually occurs when cells are exposedto a lower dose of radiation over an extended period of time (or chronic radiation). It is this kindof exposure that may lead to cancer and genetic effects (problems in offspring), depending on thestrength of the dose. With exposure to high-dose, short-term radiation (or acute radiation), dam-age may occur to the point where a cell is unable to perform any further function, includingreproduction, and may even die. On a large enough scale (for example, at the organ level) thiskind of damage is likely to cause radiation sickness. Symptoms of radiation sickness include skinthat seems slightly sunburned, hair loss, fatigue, internal bleeding, fever, nausea, dehydration anddiarrhea, bleeding ulcers, loss of coordination, confusion, coma, convulsions, shock, and more.

2.3 Product typesThe standard product types generated by the CRaTER Science Operations Center are listed inTable 6.

Table 6: Product types

ProductName1

Key/PhysicalParameters

NASALevel

CODMAC Processing Inputs Product

FormatCR_L0_PSCR_L0_SSCR_L0_HK

Raw CRaTER EDR: pulseheights, secondary science,and instrumenthousekeeping

0 2 Raw data from LRO MOC asrecorded on LRO

BinaryCCSDSPackets

CR_L1_PSCR_L1_SSCR_L1_HK

Science data, split intoprimary and secondaryscience, and housekeeping

1 3 Level 0 data with pulseheights in eV & housekeepingin engineering units

ASCII

CR_L2_PSCR_L2_SSCR_L2_HK

LET deposition in silicon.Pulse heights convertedinto energy depositedwithin each detector.

2 3/42 Level 1 data with pulseheights converted to LETenergy and UTC time tagsadded

ASCII

CR_L3_SCI LET spectra in siliconassociated withbackground (GCRs) andspecific SEP events

3 5 Level 2 data accumulated overspecific time intervals

ASCII

CR_L4_SCI Modelled LET spectra intissue

4 5 Level 3 data converted tomodelled LET in tissue

ASCII

The current document only refers to the Experiment Data Record (EDR), which consists of thebinary NASA Level 0 products, as output by the instrument, stored in the spacecraft’s solid-staterecorder, and transmitted to the ground, accompanied by ancillary files supplied by the LROMission Operations Center (MOC). The only changes made to these files by spacecraft amdground processing are as follows: 1 These names are used by the CRaTER SOC. The corresponding PDS names are shown in §7.1-7.3.2 The CR_L2_HK and CR_L2_SS products are CODMAC Level 3, CR_L2_PS is Level 4.

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• Addition of 64-byte file headers to document the processing history• Removal of duplicate data packets• Division of raw housekeeping files into their instrument housekeeping and secondary

science components

Each raw CRaTER data file output from the instrument (MOC-3 and MOC-4 in Table 7) is atime-ordered series of measurements, prefixed by a 64-byte header that is created onboard. EDRproducts are generated for all mission phases during which CRaTER data are acquired.

2.3.1 Experiment Data RecordTable 7 describes the files that are transmitted from the MOC to the CRaTER SOC and areincluded in the CRaTER EDR archive. Two come from the CRaTER instrument, one from otherspacecraft systems, 9 are added by the MOC itself, and 4 by the JPL Navigation Facility (NAIF).

Table 7: EDR data productsID Product Format File Name

MOC-2 SLCK Clock Correlation SPICE LRO_CLKCOR_yyyyddd_Vvv.tcs

MOC-3 Spacecraft Housekeeping Data CCSDS CRAT_SCHK_yyyyddd_nnnnnnn.hk

MOC-4 CRaTER Housekeeping Data CCSDS CRAT_yyyyddd_nnnnnnn.hk

MOC-5 CRaTER Raw Measurement Data CCSDS CRAT_yyyyddd_nnnnnnn.sci

MOC-7 Daily Command Load Report ASCII LROATS_yyyyddd_Vvv.txt

MOC-33 Event Kernel SPICE LRO_EvtKer_yyyyddd_Vvv.txt

MOC-40 Frame Kernels SPICE LRO_FRAMES_yyyyddd_Vvv.txt

MOC-42 Definitive Spacecraft Orientation (CK) SPICE FDF35_yyyyddd_yyyyddd_nnn.xsp

MOC-46 CRaTER Housekeeping Summary ASCII CRAT_yyyyddd_nnnnnnn_hk.meta

MOC-47 CRaTER Raw Measurement Summary ASCII CRAT_yyyyddd_nnnnnnn_sci.meta

FDF-29 Definitive Spacecraft Ephemeris (SPK) SPICE FDF29_yyyyddd_yyyyddd_nnn.xsp

FDF-33 High Precision Lunar Orientation (PCK) SPICE FDF33_yyyyddd_nnn.xsp

NAIF-1 Planetary Ephemeris (SPK) SPICE TBDNAIF-2 Leap Second Kernel (LSK) SPICE TBDNAIF-3 Generic Planetary Constants (PCK) SPICE TBDNAIF-4 High Precision Lunar Orientation (PCK) SPICE TBD

The instrument products are described in detail in Section 4 of this document. The other productsare defined in §4 of 431–ICD–000049 (see §2.5).

2.4 Scope of this documentThe specifications in this SIS apply to all CRaTER Experiment Data Record products submittedfor archive to the Planetary Data System (PDS), for all phases of the LRO mission. Somesections of this document describe parts of the CRaTER archive and archiving process that aremanaged by the PDS archive team. These sections have been provided for completeness ofinformation and are not maintained by the CRaTER team.

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2.5 Applicable DocumentsISO 9660-1988, Information Processing—Volume and File Structure of CD-ROM for

Information Exchange, April 15, 1988.Planetary Science Data Dictionary Document, August 28, 2002, Planetary Data System,

JPL D-7116, Rev. E.Planetary Data System Data Preparation Workbook, February 17, 1995, Version 3.1,

JPL D-7669, Part 1.Planetary Data System Standards Reference, August 1, 2003, Ver. 3.6, JPL D-7669, Part 2.

Lunar Reconnaissance Orbiter Mission Concept of Operations, 431-OPS-000042, 08/12/2005.Lunar Reconnaissance Orbiter Project Data Management and Archive Plan, 431-PLAN-00182.

Detailed Mission Requirements for the Lunar Reconnaissance Orbiter Ground System,431-RQMT-000048, Rev. B, 09/19/2006.

Spacecraft to CRaTER Data Interface Control Document, 431-ICD-000104, Rev. A, 08/11/2006.External Systems Interface Control Document for the Lunar Reconnaissance Orbiter Ground

System, 431-ICD-000049, v1.0, 07/17/2006.Planetary Data System Proposer’s Archiving Guide, JPL D-26359, v.1.0, 06/15/2003.

Planetary Data System Archive Preparation Guide, JPL D-31224, v.1.1, 08/29/2006.CRaTER Science Operations Center Requirements Document, 32-01209, Rev. A, 10/25/2006.

CRaTER Science Team and PDS–PPI Node ICD, 32-01280, Rev. A, 10/27/2006.CRaTER Information Technology Security Plan, 32-01208, Rev. 01, 09/19/2005.

CRaTER Functional Instrument Description and Performance Verification Plan, 32-05002, Rev.01, 06/20/2006.

CRaTER Educational and Public Outreach Plan, TBD.

2.6 AudienceThis document is intended to be useful to those who wish to understand the format and contentof the CRaTER Experiment Data Record submitted to the PDS archive. Such users mighttypically be software engineers, data analysts, or planetary scientists.

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3 Archive volume generationThe CRaTER Experiment Data Record archive collection is produced by the CRaTER ScienceOperations Team in cooperation with the PDS Planetary Plasma Interactions (PPI) Node at theUniversity of California, Los Angeles (UCLA). The archive volume creation process describedin this section sets out the roles and responsibilities of both these groups. The assignment oftasks has been agreed by both parties, and codified in an ICD (32–01280, see §2.5).

Archived data received by the PPI Node from the CRaTER team will be made electronicallyavailable to PDS users as soon as practicable but no later than as laid out in Table 7. Whensufficient data to fill a DVD-R volume have accumulated a new archive volume will be created.

3.1 Data transfer methods and delivery scheduleThe CRaTER team will deliver data to the PPI Node in standard product packages containingthree months of data, also adhering to the schedule set out in Table 8. Each package willcomprise both data and ancillary data files, organized into directory structures consistent with thevolume design described in Section 4, and combined into a deliverable file(s) using file archiveand compression software. When these files are unpacked at the PPI Node in the appropriatelocation, the constituent files will be organized in a directory structure similar to the archivevolume structure.

Table 8: Data delivery scheduleDate Delivery

Start of prime mission+ 6 months

All cruise data; all lunar orbit checkout data; the first 3 months of prime-mission data

Every 3 months Next 3 months of prime-mission data\Data files will be transferred using the Secure File Copy Protocol (SCP). The CRaTER team willsign into a user account on the PPI computer system, transfer the files in binary mode, and theninform the PPI Node via e-mail that an archive delivery has been made. The PPI Node will movethe deliverable files to their appropriate location within the PPI file system, unpack the data, andverify that both the file transfer and unpacking were successful. Once PPI has verified that it hasreceived a valid data delivery it will send a confirmatory e-mail to the CRaTER team to mark thedelivery as “received”.

Following receipt of a data delivery, PPI will organize the data into PDS archive volumestructure within its online data system. PPI will generate all of the required files associated witha PDS archive volume (index file, read-me files, etc.) as part of its routine processing ofincoming CRaTER data. Newly delivered data will be made available publicly through the PPIonline system once accompanying labels and other documentation have been validated. It isanticipated that this validation process will require at least fourteen working days from receipt ofthe data by PPI. The first two data deliveries are expected to require somewhat more time for thePPI Node to process before making the data publicly available.

The LRO prime mission begins at Lunar Orbit Insertion (LOI) and lasts for one year. Table 8formalizes the data delivery schedule for all of the CRaTER cruise and prime mission data.Archiving of products from any extended mission period will be negotiated with the LRO Projectat a later date.

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3.2 Data validationThe CRaTER EDR data archive volume set will include all CRaTER data acquired during theLRO mission. The archive validation procedure described in this section applies to volumesgenerated during both the cruise and prime phases of the mission.

PDS standards recommend that all data included in the formal archive be validated through apeer-review process. This process is designed to ensure that both the data and documentation areof sufficient quality to be useful to future generations of scientists.The CRaTER team will therefore convene a peer-review of the first archive volume that theycreate using data from the nominal LRO mission. This review will determine whether thearchived data are appropriate to meet the stated science objectives of the instrument. The panelwill also review the archive product generation process for robustness and ability to detectdiscrepancies in the end products; documentation will be reviewed for quality and completeness.One of the primary questions addressed during the peer-review process will be: “Can an expertin the use of similar data meet the stated science objectives of the experiment using only the dataand documentation included in this archive?” The peer-review panel may suggest changes to anyof the areas under review if the answer to this question is not affirmative.

As expertise with the instrument and data develops the CRaTER team may decide that changesto the structure or content of its standard data products are warranted. Should these changes beimplemented the new data product and archive volume will be subjected to a full PDS peerreview, and this document will be fully revised to reflect the modified archive. Table 2 lists thehistory of all modifications to the archive structure and contents.Additionally, the CRaTER team may generate and archive special data products that coverspecific observations or data-taking activities. This document does not specify how, when, orunder what schedule, any such special archive products are generated.

3.3 Data product and archive volume size estimatesCRaTER EDR data are organized into files that typically span a single orbit of data acquisition.Files vary in size depending on the telemetry rate and allocation. Table 9 summarizes theexpected sizes of the CRaTER EDR products. The file size estimates are based on the largestfiles that would be created at times of maximum observed radiation flux. It is anticipated thatactual file sizes, and the number of archive volumes required to store them, will be less than thisestimate.

All CRaTER EDR data are organized by the PDS team onto a single archive volume covering atime interval governed by the physical capacity of the archive volume media. The data on thevolume are organized into one-day subdirectories, with an individual volume containing betweenTBD and TBD days of data. It is anticipated that data will be archived on DVD-R media, whichhave a capacity of 4.7 GB. These media will be produced in UDF bridge format with ISOpartitions, in compliance with PDS standards.

Table 9: Data product size and archive volume production rateProduct Production rate (approximate) Days per 4.7 GB

volumeVolumes for 1-year

primary missionEDR up to 75 MB per day 62 6

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Following receipt of CRaTER data by the PPI Node it is expected that fourteen working dayswill be required before the data are made available on PPI web pages. Once sufficient data haveaccumulated a new archive volume will be created by PPI. It is anticipated that two weeks willbe required to produce and validate this new archive volume once the data delivery that fills thevolume has been made available online.

3.4 Backups and duplicatesThe PPI Node keeps three copies of each archive volume. One copy is the primary archivevolume, another is an onsite backup copy, and the final copy is a local, off-site backup copy. Thevolumes sent to the CRaTER team and the PDS Central Node are to be kept by those institutions.Once the archive volumes are fully validated and approved for inclusion in the archive, a copy ofthe data is sent to the National Space Science Data Center (NSSDC) for long-term archive in aNASA-approved deep-storage facility. The PPI Node may maintain additional copies of thearchive volumes, either on or off-site as deemed necessary. Figure 1 illustrates the process ofduplicating and disseminating CRaTER archive volumes.

Figure 1: Duplication and dissemination of CRaTER EDR archive volumes

LROCRaTER

SOC

PDSPlanetary PlasmaInteractions Node

(PPI)

PDSCentral Node

Reviewer

PDSPPI Node

backup copies

PDSPPI Nodeweb pages

NSSDCArchive

Onlinedata

delivery

Physical mediacreation and

deliveryon demand

Users

Validation report

CRaTERarchive

volume (copy4)

CRaTERarchive

volume (copy7)

Archive volume accepted intoarchive (copy 8)

CRaTER archivevolume (copies

5,6)

Archive volumesfor CRaTER team

review (copies1–3)

Standard datadelivery to

PPI

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3.5 Labeling and identificationEach CRaTER data volume bears a unique volume ID using the last two components of thevolume set ID [PDS Standards Reference, 2002]. For each physical medium, the volume set IDis USA_NASA_PDS_xxxxx_nnnn, where nnnn is the sequence number of the individualvolume. Hence the first CRaTER EDR volume has the volume ID xxxxx_0001. The CRaTEREDR data set has the PDS DATA_SET_ID xxxxx.

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4 Archive volume contentsThis section describes the contents of the CRaTER EDR archive collection volumes, includingthe file names, file contents, file types, and the organizations responsible for providing the files.The complete directory structure is shown in Figure 2. All the ancillary files described hereinappear on each CRaTER EDR volume, except where noted.

Figure 2: Archive volume directory structure

4.1 Root directoryThe following files are contained in the (top-level) root directory, and are produced by the PPINode. They are described here for information purposes only. With the exception of thehypertext file and its label, all of these files are required by the PDS volume organizationstandards.

Table 10: Root directory contentsFile Description Responsibility

AAREADME.TXT This file completely describes the volume organization andcontents (PDS label attached)

CRaTER team

AAREADME.HTM HTML version of AAREADME.TXT CRaTER teamAAREADME.LBL A PDS detached label that describes AAREADME.HTM CRaTER teamERRATA.TXT A text file containing a cumulative listing of comments and

updates concerning all CRaTER EDR products on allCRaTER volumes in the volume set published to date

CRaTER team

VOLDESC.CAT A description of the contents of this volume in a PDS formatreadable by both humans and computers

CRaTER team

ROOT

BROWSE

CATALOG

DATA

DOCUMENT

EXTRAS

INDEX

LABEL

yyyy

yyyydddSOFTWARE

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4.2 BROWSE directoryThe BROWSE directory contains daily browse plots of the CRaTER data. The contents of thisdirectory are described in Table 11

Table 11: BROWSE directory contentsFile Description Responsibility

BROINFO.TXT A description of the contents of this directory CRaTER teamyyyyddd.PDF A PDF file containing a plot of the events acquired on day

ddd of year yyyyCRaTER team

yyyyddd.LBL The PDS label for the plot file CRaTER team

4.3 CATALOG directoryThe files in the CATALOG directory provide a top-level understanding of the LRO mission,spacecraft, instruments, and data sets in the form of completed PDS templates. The informationnecessary to create the files is provided by the CRaTER team and formatted into standardtemplate formats by the PPI Node. The files in this directory are coordinated with PDS dataengineers at both the PPI Node and the PDS Central Node.

Table 12: CATALOG directory contentsFile Description Responsibility

CATINFO.TXT A description of the contents of this directory CRaTER teamINSTHOST.CAT A description of the LRO spacecraft LRO ProjectCRAT_INST.CAT PDS instrument catalog description of the CRaTER

instrumentCRaTER team

MISSION.CAT PDS mission catalog description of the LRO mission LRO Project,PPI Node

PERSON.CAT PDS personnel catalog description of CRaTER teammembers and other persons involved with generation ofCRaTER EDR data products

CRaTER team,LRO Project,PPI Node

PROJREF.CAT References mentioned in INSTHOST.CAT andMISSION.CAT

LRO Project,CRaTER team

CRAT_EDR.CAT PDS data set catalog description of the CRaTER raw data CRaTER team,PPI Node

REF.CAT CRaTER-related references mentioned in other CAT files CRaTER team,PPI Node

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4.4 DATA directory

4.4.1 ContentsThe DATA directory contains the actual data products and ancillary information files produced bythe CRaTER team. The EDR dataset is primarily raw science data in the form of CCSDStelemetry packets, organized into correct time sequence, time tagged, and edited to removeobviously bad data.When archived these data are of the highest quality possible. Any residual issues pertaining tothe data are documented in AAREADME.TXT, ERRATA.TXT and CRAT_EDR.CAT. Users arereferred to these files for a detailed description of any outstanding matters associated with thearchived data.

Additional files located in the DATA directory include ancillary information files (engineering,housekeeping) and channelized data files (e.g. spacecraft attitude, status information forCRaTER instrumental subsystems), provided to facilitate data processing and analysis. Time isrepresented in CRaTER EDR files in a number of formats. Appendix B describes the derivationof these different formats.

Table 13: DATA directory contentsFile Description Responsibility

DATAINFO.TXT A description of the contents of this directory CRaTER teamCRATDATA.TXT A file describing aspects of CRaTER EDR data in greater

detailCRaTER team

yyyy Subdirectories containing CRaTER EDR data acquired inyear yyyy.

CRaTER team

4.4.2 Subdirectory structureIn order to manage files in an archive volume more efficiently the DATA directory is divided intosubdirectories. The two levels of division are based on time; data are organized into yearlysubdirectories which are further divided into a number of daily subdirectories. The namingconvention for the yearly directories is yyyy, and for the daily directories it is yyyyddd, whereddd is the three-digit day of year. For example, all data for the year 2009 are contained belowthe directory 2009, with data for January 1 2009 found in the subdirectory 2009/2009001,and so on.

4.4.3 Required filesA PDS label describes each file in the DATA path of an archive volume. Text documentation fileshave attached (internal) PDS labels and data files have detached labels. Detached PDS label fileshave the same root name as the file they describe but have the extension LBL. The format of thedata files for each standard data product is constant throughout the archive volume and isdescribed in FMT files located in the DATA directory (see Section 4.4.1).

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4.4.4 The yyyy/yyyyddd subdirectoryThis directory contains CRaTER data files and their corresponding PDS labels. The data in thesefiles correspond to a time interval of one day, the particular day being identified from both thefile name and the name of the parent directory. Science data extracted from various sources (i.e.types of data packet) are included in Table 14.

Table 14: DATA/yyyy/yyyyddd directory contentsFilename Description

LRO_CLKCOR_yyyyddd_Vvv.tcs SLCK Clock CorrelationCRAT_SCHK_yyyyddd_nnnnnnn.dat Spacecraft Housekeeping DataCRAT_HK_yyyyddd_nnnnnnn.dat CRaTER Housekeeping DataCRAT_PRI_yyyyddd_nnnnnnn.dat CRaTER Primary Science DataCRAT_SEC_yyyyddd_nnnnnnn.dat CRaTER Secondary Science DataLROATS_yyyyddd_Vvv.txt Daily Command Load ReportLRO_EvtKer_yyyyddd_Vvv.txt Event KernelLRO_FRAMES_yyyyddd_Vvv.txt Frame KernelsFDF35_yyyyddd_yyyyddd_nnn.xsp Definitive Spacecraft Orientation (CK)CRAT_yyyyddd_nnnnnnn_hk.meta CRaTER Housekeeping SummaryCRAT_yyyyddd_nnnnnnn_sci.meta CRaTER Raw Measurement SummaryFDF29_yyyyddd_yyyyddd_nnn.xsp Definitive Spacecraft Ephemeris (SPK)FDF33_yyyyddd_nnn.xsp High Precision Lunar Orientation (PCK)TBD Planetary Ephemeris (SPK)TBD Leap Second Kernel (LSK)TBD Generic Planetary Constants (PCK)TBD High Precision Lunar Orientation (PCK)

4.5 DOCUMENT directoryThe DOCUMENT directory contains a range of documentation considered either necessary oruseful for users to understand the archive data set. Documents may be included in multipleforms, for example, ASCII, PDF, MS Word, or HTML. PDS standards require that anydocumentation needed for use of the data be available in an ASCII format. HTML and PostScriptare acceptable ASCII formats in addition to plain text. The following files are contained in theDOCUMENT directory, grouped into the subdirectories shown.

Table 15: DOCUMENT directory contentsFilename Description Responsibility

DOCINFO.TXT A description of the contents of this directory CRaTER teamGAPS_HK.TXT A cumulative listing of the missing Housekeeping

packets up to and including the days for the currentvolume

CRaTER team

GAPS_HK.LBL A PDS detached label for GAPS_HK.TXT CRaTER teamPPI Node

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Filename Description Responsibility

GAPS_PRI.TXT A cumulative listing of the missing Primary Sciencepackets for the days up to and including the days forthe current volume

CRaTER team

GAPS_PRI.LBL A PDS detached label for GAPS_PRI.TXT CRaTER teamGAPS_SEC.TXT A cumulative listing of the missing Secondary Science

packets for the days up to and including the days forthe current volume

CRaTER team

GAPS_SEC.LBL A PDS detached label for GAPS_SEC.TXT CRaTER teamMODE_CHANGES.ASC A cumulative listing of instrument mode changes for

the days up to and including the days for the currentvolume

CRaTER team

MODE_CHANGES.LBL A PDS detached label for MODE_CHANGES CRaTER teamVOLSIS.DOC The archive volume SIS (this document), in MS Word

formatCRaTER team,PPI Node

VOLSIS.HTM The SIS in HTML format CRaTER teamVOLSIS.ASC The SIS in plain ASCII text format CRaTER teamVOLSIS.PDF The SIS in PDF format CRaTER teamVOLSIS.LBL A PDS detached label for the SIS document CRaTER team

4.6 EXTRAS directoryThe EXTRAS directory contains files which facilitate the use of the archive volume but whichare not considered part of the archive itself. Included in this directory are those SPICE kernelsthat were used to process the data files. To process the CRaTER data users are advised to checkwith the NAIF Node for updated kernels that may subsequently be made available.

4.7 INDEX directoryThe following files are contained in the INDEX directory and are produced by the PPI Node.They are described here for information purposes only. The INDEX.TAB file contains a listingof all data products on the archive volume. In addition, there is a cumulative index file(CUMINDEX.TAB) that lists all data products in the CRaTER EDR archive volume set to date.The index and index information (INDXINFO.TXT) files are required by the PDS volumestandards. The manifest tables are added by the PPI Node for completeness and are not requiredfiles. The cumulative index file is also a PDS requirement; however this file may not bereproduced on each data volume if it becomes clear in the early production that the file will growto a substantial fraction of the archive media volume. An online and web-accessible cumulativeindex file will be available at the PPI Node while data volumes are being produced.

Table 16: INDEX directory contentsFile Description Responsibility

INDXINFO.TXT A description of the contents of this directory CRaTER teamCUMINDEX.TAB A table listing all CRaTER data products published so far

in this volume set, including the data on this volumePPI Node

CUMINDEX.LBL A PDS detached label that describes CUMINDEX.TAB PPI Node

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File Description Responsibility

INDEX.TAB A table listing all CRaTER data products on this volume CRaTER teamINDEX.LBL A PDS detached label that describes INDEX.TAB CRaTER team

4.8 LABEL directoryThe LABEL directory contains format files (*.FMT) that describe the contents of binaryCRaTER files in the DATA subdirectories. They are themselves described by a LABINFO.TXTfile.

Table 17: LABEL directory contentsFile Description Responsibility

CCSDSHDR.FMT Bit-level description of CCSDS primary header CRaTER teamCRATHK.FMT Bit-level description of housekeeping records CRaTER teamCRATPRI.FMT Bit-level description of primary science records CRaTER teamCRATSEC.FMT Bit-level description of secondary science records CRaTER teamCRATSECHDR.FMT Bit-level description of CRaTER secondary header CRaTER teamLABINFO.TXT A description of the contents of this directory CRaTER teamLROHDR.FMT Bit-level description of 64-byte CRaTER file headers CRaTER team

4.9 SOFTWARE directoryThe SOFTWARE directory contains software used to display CRaTER EDR data.

Table 18 shows the contents of the SOFTWARE directory.

Table 18: SOFTWARE directory contentsFile Description Responsibility

SOFTINFO.TXT A description of the contents of this directory CRaTER team,CRATLIST.CPP C++ source code that compiles into program cratlist

which lists the contents of CRaTER EDR data files.CRaTER team

CRATLIST.PL PERL program to list the contents of CRaTER EDR datafiles.

CRaTER team

CRATER_0.H C++ Header File containing definitions of CRaTER EDRrecord formats.

CRaTER team

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5 Archive volume formatThis section describes the format of CRaTER EDR archive volumes. Data that comprise theCRaTER standard product archives will be formatted in accordance with PDS specifications[Planetary Science Data Dictionary, August 2002; PDS Data Preparation Workbook, 1995;PDS Standards Reference, October 2002].

5.1 Disk formatAlthough the CRaTER team does not control the disk format, it is described in this SISdocument for completeness. Archive volumes have a UDF-ISO bridge format file system with anISO partition that is compatible with DVD readers and drivers for MS-DOS, MS-Windows (95or higher), Macintosh, and Solaris. The CRaTER volumes will be created in accordance with theISO 9660 level 2 Interchange Standard [ISO 9660, 1988] so that CD-R products can be createdfrom the archive without modifying file names or other parameters.

5.2 File formatsThe following section describes file formats for the kinds of files contained on archive volumes.For more information, see Appendix B of the PDS Data Preparation Workbook [1995].

5.2.1 Document filesDocument files with a TXT extension exist in nearly all directories. They are ASCII files withembedded PDS labels. All document files contain 80-byte fixed-length records, with a carriagereturn character (ASCII 13) in the 79th byte and a line feed character (ASCII 10) in the 80thbyte. This format allows the files to be read by the MacOS, DOS, Windows, UNIX, OS2, andVMS operating systems.In general, documents are provided in ASCII text format. However, some documents in theDOCUMENT directory contain formatting and figures that cannot be rendered as ASCII text.Hence these documents are also given in additional formats such as hypertext, Microsoft Word,and Adobe Acrobat (PDF). Hypertext files contains ASCII text plus hypertext markup language(HTML) commands that enable them to be viewed in a web browser such as Mozilla orMicrosoft Internet Explorer. Hypertext documents may reference ancillary files, such as images,that are incorporated into the document by the web browser.

5.2.2 Tabular filesTabular files (TAB extension) exist in the DATA and INDEX directories. Tabular files are ASCIIfiles formatted for direct reading into database management systems on various computers.Columns are fixed length, separated by commas or whitespace, and character fields are enclosedin double quotation marks ("). Character fields are padded with spaces to keep quotation marksin the same columns of successive records. Character fields are left justified, and numeric fieldsare right justified. The “start byte” and “bytes” values listed in the labels do not include thecommas between fields or the quotation marks surrounding character fields. The records are offixed length, and the last two bytes of each record contain the ASCII carriage return and line feedcharacters. This line format allows a table to be treated as a fixed length record file on computersthat support this file type and as a text file with embedded line delimiters on those that don'tsupport it.

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Detached PDS label files will describe all tabular files. A detached label file has the same nameas the data file it describes, but with the extension LBL. For example, the file INDEX.TAB isaccompanied by the detached label file INDEX.LBL in the same directory.

5.2.3 PDS labelsAll data files in the CRaTER Standard Product Archive Collection have associated detachedPDS labels [see Planetary Science Data Dictionary, August 2002; PDS Standards Reference,October 2002]. These label files are named using the same prefix as the data file together with anLBL extension.

A PDS label, whether embedded or detached from its associated file, provides descriptiveinformation about the associated file. The PDS label is an object-oriented structure consisting ofsets of “keyword = value” declarations. The object that the label refers to (e.g. IMAGE,TABLE, etc.) is denoted by a statement of the form:

^object = location

in which the carat character (^, also called a pointer in this context) indicates where to find theobject. In a PDS label, the location denotes the name of the file containing the object, along withthe starting record or byte number, if there is more than one object in the file. For example:

^HEADER = ("98118.TAB", 1)^TABLE = ("98118.TAB", 1025 <BYTES>)

indicates that the HEADER object begins at record 1 and that the TABLE object begins at byte1025 of the file 98118.TAB. The file 98118.TAB must be located in the same directory as thedetached label file.

Below is a list of the possible formats for the ^object definition in labels in this product.^object = n^object = n <BYTES>^object = "filename.ext"^object = ("filename.ext", n)^object = ("filename.ext", n <BYTES>)

where• n is the starting record or byte number of the object, counting from the beginning of the

file (record 1, byte 1),• <BYTES> indicates that the number given is in units of bytes (the default is records),• filename is the up-to-27-character, alphanumeric upper-case file name,• ext is the up-to-3-character upper-case file extension, and,• all detached labels contain 80-byte fixed-length records, with a carriage return character

(ASCII 13) in the 79th byte and a line feed character (ASCII 10) in the 80th byte. Thisallows the files to be read by the MacOS, DOS, Windows, UNIX, OS2, and VMSoperating systems.

Examples of PDS labels required for the CRaTER archive are given in Appendix C.

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5.2.4 Catalog filesCatalog files (extension CAT) exist in the Root and CATALOG directories. They are plain textfiles formatted in an object-oriented structure consisting of sets of “keyword = value”declarations.

5.2.5 Index filesThe PDS team provides PDS index files. The format of these files is described in this SISdocument for completeness.A PDS index table contains a listing of all data products on an archive volume. When a dataproduct is described by a detached PDS label, the index file points to the label file which in turnpoints to the data file. When a data product is described by an attached PDS label, the index filepoints directly to the data product. A PDS index is an ASCII table composed of requiredcolumns (Product_ID, File_Specification_Name, Product_Creation_Date,Data_Set_Id) and optional columns (user defined). When values are constant across an entirevolume, it is permissible to promote the value out of the table and into the PDS label for theindex table.To facilitate users’ searches of the CRaTER data submission, a few optional columns will beincluded in the index table. In particular, the file start and stop times will be included. Table 19contains a description of the CRaTER archive volume index files. Index files are by definitionfixed length ASCII files containing comma-delimited fields. Character strings are quoted usingdouble quotes. The Start byte column gives the location of the first byte of the column within thefile, skipping over delimiters and quotation marks.

Table 19: Format of index files

Column name Startbyte Bytes Description

Product_Id 2 27 PDS Product ID – A unique identifier for all productswithin a PDS data set.

File_Specification_Name 33 80 The full specification of file name and the path to thePDS label file that describes the product, relative to theroot of the archive volume.

Start_Time 117 22 The time of the first record in the data file.Stop_Time 141 22 The time of the last record in the data file.Product_Type 193 12 The “type” of the data file.Data_Set_Id 210 40 The PDS ID of the data set of which this file is a

member.Product_Creation_Date 244 8 The date when the product was delivered to the PDS.

The PPI node also maintains a cumulative index file that describes the location of every dataproduct across every volume of a multi-volume archive. The cumulative index file has all of thesame columns as the index file, plus one additional column: the PDS VOLUME_ID. TheVOLUME_ID column is the first column in the table. It is an 11-byte character string beginning atbyte 2 (begin quote at byte 1). All of the other columns in the index table are displaced by 15bytes such that the Product_id column begins at byte 17 rather than byte 2, etc.

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5.2.6 EDR data filesAs described in Section 2.3.1, the EDR data set consists of triplets of data files—primary andsecondary science and instrument housekeeping. Each file begins with a 64-byte header createdby the spacecraft computer (see Table 20.) Table 21 to

Table 23 describe the structure and content of subsequent records contained within these files, andTable 24 and Table 25 describe sub-structures within these records.

Table 20: Format of LRO file header recordsByte Bit Bits Name Description

0 0 32 FileID Numerical file identifier (200 = Primary Science, 201 =Housekeeping, 202 = Secondary Science)

4 32 32 Spare Spare8 64 32 StartTimeSec S/C time file was opened for writing (seconds from TBD)

12 96 32 StartTimeSubSec S/C time file was opened for writing (1/32 second)16 128 32 StopTimeSec S/C time file was closed (seconds from TBD)20 160 32 StopTimeSubSec S/C time file was closed (1/32 second)24 192 320 FileName Pathname of the file as it appeared onboard LRO, right-

padded with NULs, e.g., “/SSR2/CRAT/CR...”

Table 21: Format of CRaTER Primary Science Data file recordsByte Bit Bits Name Description

0 0 48 PrimaryHdr CCSDS Primary Header, ApId = 120 (see Table 24)6 48 48 SecondaryHdr Secondary Header (see Table 25)

12 96 n*6*12 Event[n][6] Signal recorded as a result of a single particle event

Table 22: Format of CRaTER Secondary Science Data file recordsByte Bit Bits Name Description

0 0 48 PrimaryHdr CCSDS Primary Header, ApId = 121 (see Table 24)6 48 48 SecondaryHdr Secondary Header (see Table 25)

12 96 1 BiasCntrl Detector Bias Delayed Control (1 = enabled)12 97 1 BiasCmd Detector Bias Command (1 = on)12 98 1 CalLow Electrical Calibration Range Low (1 = enabled)12 99 1 CalHigh Electrical Calibration Range High (1 = enabled)13 100 1 CalRate Calibration Rate (1 = 2048 events/sec; 0 = 8 events/sec)13 101 6*1 ProcDFlag[6] Detector Processing Enabled (1 = enabled)13 102 5 LastCmd Address of Last Command to CRaTER14 112 16 LastValue Contents of Last Command to CRaTER16 128 8 DiscThin Low Level Discriminator for Thin Detectors (D1, D3, D5)17 136 8 DiscThick Low Level Discriminator for Thick Detectors (D2, D4, D6)18 144 64*1 Mask[64] Discriminator Accept Mask26 208 6*16 Single[6] Detector Singles Counter (one for each of 6 detectors)

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Byte Bit Bits Name Description

38 304 16 Good Good Events Counter40 320 16 Reject Rejected Events Counter42 336 16 Total Total Events Counter

Table 23: Format of CRaTER Housekeeping Data file recordsByte Bit Bits Name Description

0 0 48 PrimaryHdr CCSDS Primary Header, ApId = 122 (see Table 24)6 48 48 SecondaryHdr Secondary Header (see Table 25)

12 96 16 V28bus Least significant 12 bits: Spacecraft 28VDC bus voltage;most significant 4 bits: FPGA revision code

14 112 16 V5digital +5VDC digital regulated voltage16 128 16 V5plus Least significant 12 bits: +5VDC analog regulated voltage;

most significant 4 bits: 0xf if analog voltage is absent(remaining h/k fields are invalid), 0x0 otherwise

18 144 16 V5neg -5VDC analog regulated voltage20 160 16 I28bus Instrument current drain off spacecraft bus22 176 6*16 BiasCurrent[6] Detector bias current34 272 16 BiasVoltThin Thin detector (D1, D3, D5) bias voltage36 288 16 BiasVoltthick Thick detector (D2, D4, D6) bias voltage38 304 16 CalAmp Electrical calibration voltage amplitude40 320 16 LLDThin Low Level Discriminator voltage for thin detectors (D1,

D3, D5)42 336 16 LLDThick Low Level Discriminator voltage for thick detectors (D2,

D4, D6)44 352 16 Ttelescope Temperature of telescope assembly46 368 16 Tanalog Temperature of analog electronics48 384 16 Tdigital Temperature of digital electronics50 400 16 Tpower Temperature of regulate power supply52 416 16 Tref Temperature of reference location on telescope wall54 432 16 RadHighSens High Sensitivity Radiation monitor voltage56 448 16 RadMedSens Medium Sensitivity Radiation monitor voltage58 464 16 RadLowSens Low Sensitivity Radiation monitor voltage60 480 16 Tprt Temperature of reference location on instrument chassis

(ground test only)62 496 16 Purge Flow rate of GN2 purge (ground test only)

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Table 24: Format of CCSDS Primary Header structureByte Bit Bits Name Description

0 0 3 Version CCSDS Version Number0 3 1 PacketType Packet Type1 4 1 SecHdrFlag Secondary Header Flag (1 = packet follows)1 5 11 ApId Application Process Identifier (120 = primary science;

121 = secondary science; 122 = housekeeping)2 16 2 SegFlags Packet Segmentation Flags2 18 14 SeqCount Sources Sequence Count (separate for each ApId)4 32 16 PacketLength Packet Length (# bytes following primary header – 1)

Table 25: Format of CRaTER Secondary Header structureByte Bit Bits Name Description

0 0 1 Reserved1 Reserved (value = 0)0 1 31 Time Spacecraft Time in Seconds (seconds elapsed since 1

January 2001 UT)4 32 4 FracTime Spacecraft Time in Fractional Seconds (1/16 second units)5 36 5 Reserved2 Reserved (value = 0)5 41 1 TestFlag Test Mode Flag (1 = test enabled)5 42 1 OneHertz External One Hertz time sync pulse (1 = not received)5 43 5 SerialNumber Instrument Serial Number

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6 Support staff and cognizant persons

Table 26: Archive collection support staffName Address Phone Email

CRaTER teamProf. Harlan SpencePrincipal Investigator

Boston UniversityDepartmernt of AstronomyCAS Room 410725 Commonwealth Ave.Boston MA 02215 USA

+001 617353-7421

spence@bu.edu

Dr. Justin KasperProject Scientist

MIT 73-67570 Vassar StreetCambridge MA 02139-4307 USA

+001 617253-7611

jck@space.mit.edu

Dr. Peter FordScience OperationsCenter Lead

MIT 37-57170 Vassar StreetCambridge MA 02139-4307 USA

+001 617253-6485

pgf@space.mit.edu

Mr Robert GoekeProject Engineer

MIT NE80-60991 Hampshire StreetCambridge MA 02139 USA

+001 617253-1910

goeke@space.mit.edu

Ms Joan QuigleyData ProcessingDeveloper

MIT 37-662C70 Vassar StreetCambridge MA 02139-4307 USA

+001 617253-4287

jcq@space.mit.edu

UCLAMr Steven JoyPPI OperationsManager

IGPPUCLA405 Hilgard AvenueLos Angeles, CA 90095-1567USA

+001 310825 3506

sjoy@igpp.ucla.edu

Mr Joseph MafiPPI Data Engineer

IGPPUCLA405 Hilgard AvenueLos Angeles, CA 90095-1567USA

+001 310206 6073

jmafi@igpp.ucla.edu

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7 Appendix A. PDS label filesAll CRaTER instrument data files are accompanied by PDS label files, possessing the samenames are the files they describe, but with the extension LBL. The basic content for these labelfiles is as follows, where the NOTE field is reserved for product-specific comments:

7.1 Primary Science Data Label FilePDS_VERSION_ID = PDS3DATA_SET_ID = "LRO-CRAT-1-EDR-RAW-DATA-V1.0"STANDARD_DATA_PRODUCT_ID = "CRAT_PRI"PRODUCT_ID = "CRAT_PRI_yyyyddd_nnnnnnn"PRODUCT_TYPE = DATAPRODUCT_VERSION_ID = "1"PRODUCT_CREATION_TIME = yyyy-mm-ddThh:mm:ss.sss

FILE_RECORDS = nnnnn

START_TIME = yyyy-mm-ddThh:mm:ss.sssSTOP_TIME = yyyy-mm-ddThh:mm:ss.sssSPACECRAFT_CLOCK_START_COUNT = "ssssssssss.sss"SPACECRAFT_CLOCK_STOP_COUNT = "ssssssssss.sss"

INSTRUMENT_HOST_NAME = "LRO"INSTRUMENT_HOST_ID = "CRAT"ORBIT_NUMBER = nnnnnINSTRUMENT_NAME = "CRaTER"INSTRUMENT_ID = "CRAT"DESCRIPTION = "CRaTER consists of a stack of 6 charged

particle detectors embedded within structuresof aluminum and plastic. It investigates theeffect of galactic cosmic rays and high-energysolar particles on tissue-equivalent plasticsas a constraint on models of biologicalresponse to background space radiation."

NOTE = "text comment"

^CRATPRISCI = ("CRAT_PRI_yyyyddd_nnnnnnn.DAT",64 <BYTES>)OBJECT = CRATPRISCI INTERCHANGE_FORMAT = "BINARY" ROWS = nnnnn ^STRUCTURE = "CRATPRISCI.FMT" DESCRIPTION = "CRaTER Instrument Primary Science packets."END_OBJECT = TABLE

^HEADER = "CRAT_PRI_yyyyddd_nnnnnnn.DAT"OBJECT = LROHDR INTERCHANGE_FORMAT = "BINARY" BYTES = 64 ^STRUCTURE = "LROHDR.FMT" DESCRIPTION = "Standard 64-byte header inserted by the LRO

ground system.”END_OBJECT = LROHDR

END

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7.2 Secondary Science Data Label File

PDS_VERSION_ID = PDS3DATA_SET_ID = "LRO-CRAT-1-EDR-RAW-DATA-V1.0"STANDARD_DATA_PRODUCT_ID = "CRAT_SEC"PRODUCT_ID = "CRAT_SEC_yyyyddd_nnnnnnn"PRODUCT_TYPE = DATAPRODUCT_VERSION_ID = "1"PRODUCT_CREATION_TIME = yyyy-mm-ddThh:mm:ss.sss

RECORD_TYPE = FIXED_LENGTHRECORD_BYTES = 44FILE_RECORDS = nnnnn

START_TIME = yyyy-mm-ddThh:mm:ss.sssSTOP_TIME = yyyy-mm-ddThh:mm:ss.sssSPACECRAFT_CLOCK_START_COUNT = "ssssssssss.sss"SPACECRAFT_CLOCK_STOP_COUNT = "ssssssssss.sss"

INSTRUMENT_HOST_NAME = "LRO"INSTRUMENT_HOST_ID = "CRAT"ORBIT_NUMBER = nnnnnINSTRUMENT_NAME = "CRaTER"INSTRUMENT_ID = "CRAT"DESCRIPTION = "CRaTER consists of a stack of 6 charged

particle detectors embedded within structuresof aluminum and plastic. It investigates theeffect of galactic cosmic rays and high-energysolar particles on tissue-equivalent plasticsas a constraint on models of biologicalresponse to background space radiation."

NOTE = "text comment"

^CRATSECSCI = ("CRAT_SEC_yyyyddd_nnnnnnn.DAT",3)OBJECT = CRATSECSCI INTERCHANGE_FORMAT = "BINARY" ROWS = nnnnn COLUMNS = 27 ROW_BYTES = 44 ^STRUCTURE = "CRATSECSCI.FMT" DESCRIPTION = "CRaTER Instrument Secondary Science packets."END_OBJECT = TABLE

^HEADER = "CRAT_SEC_yyyyddd_nnnnnnn.DAT"OBJECT = LROHDR INTERCHANGE_FORMAT = "BINARY" BYTES = 64 ^STRUCTURE = "LROHDR.FMT" DESCRIPTION = "Standard 64-byte header inserted by the LRO

ground system, padded on the right with 24 NULbytes (0x00).”

END_OBJECT = LROHDR

END

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7.3 Housekeeping Data Label File

PDS_VERSION_ID = PDS3DATA_SET_ID = "LRO-CRAT-1-EDR-RAW-DATA-V1.0"STANDARD_DATA_PRODUCT_ID = "CRAT_HK"PRODUCT_ID = "CRAT_HK_yyyyddd_nnnnnnn"PRODUCT_TYPE = DATAPRODUCT_VERSION_ID = "1"PRODUCT_CREATION_TIME = yyyy-mm-ddThh:mm:ss.sss

RECORD_TYPE = FIXED_LENGTHRECORD_BYTES = 64FILE_RECORDS = nnnnn

START_TIME = yyyy-mm-ddThh:mm:ss.sssSTOP_TIME = yyyy-mm-ddThh:mm:ss.sssSPACECRAFT_CLOCK_START_COUNT = "ssssssssss.sss"SPACECRAFT_CLOCK_STOP_COUNT = "ssssssssss.sss"

INSTRUMENT_HOST_NAME = "LRO"INSTRUMENT_HOST_ID = "CRAT"ORBIT_NUMBER = nnnnnINSTRUMENT_NAME = "CRaTER"INSTRUMENT_ID = "CRAT"DESCRIPTION = "CRaTER consists of a stack of 6 charged

particle detectors embedded within structuresof aluminum and plastic. It investigates theeffect of galactic cosmic rays and high-energysolar particles on tissue-equivalent plasticsas a constraint on models of biologicalresponse to background space radiation."

NOTE = "text comment"

^CRATERHK = ("CRAT_HK_yyyyddd_nnnnnnn.DAT",2)OBJECT = CRATERHK INTERCHANGE_FORMAT = "BINARY" ROWS = nnnnn COLUMNS = 28 ROW_BYTES = 64 ^STRUCTURE = "CRATERPRISCI.FMT" DESCRIPTION = "CRaTER Instrument Housekeeping packets."END_OBJECT = TABLE

^HEADER = "CRAT_PRI_yyyyddd_nnnnnnn.DAT"OBJECT = LROHDR INTERCHANGE_FORMAT = "BINARY" BYTES = 64 ^STRUCTURE = "LROHDR.FMT" DESCRIPTION = "Standard 64-byte header inserted by the LRO

ground system.”END_OBJECT = LROHDR

END

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7.4 Data record formatsThe files comprising CRaTER EDR products have record formats which are specified in the PDSlabel files and in the accompanying FMT files located in the LABEL directory. This sectionshows the format component of PDS labels for each of the three types of binary data file.

7.4.1 LRO 64-byte EDR Binary Header RecordOBJECT = COLUMN NAME = FILEID COLUMN_NUMBER = 1 START_BYTE = 1 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 200 MAXIMUM = 202 DESCRIPTION = "Numerical file identifier."END_OBJECT = COLUMNOBJECT = COLUMN NAME = SPARE COLUMN_NUMBER = 2 START_BYTE = 5 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 0 DESCRIPTION = "Spare."END_OBJECT = COLUMNOBJECT = COLUMN NAME = STARTTIMESEC COLUMN_NUMBER = 3 START_BYTE = 9 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = SECONDS MINIMUM = 0 MAXIMUM = 2147483647 DESCRIPTION = "Spacecraft time file was opened for writing."END_OBJECT = COLUMNOBJECT = COLUMN NAME = STARTTIMESUBSEC COLUMN_NUMBER = 4 START_BYTE = 13 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "SECONDS/32" MINIMUM = 0 MAXIMUM = 4294967295 DESCRIPTION = "Spacecraft time file was opened for writing."END_OBJECT = COLUMNOBJECT = COLUMN NAME = STOPTIMESEC COLUMN_NUMBER = 5 START_BYTE = 17 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = SECONDS MINIMUM = 0

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MAXIMUM = 2147483647 DESCRIPTION = "Spacecraft time file was closed."END_OBJECT = COLUMNOBJECT = COLUMN NAME = STOPTIMESUBSEC COLUMN_NUMBER = 6 START_BYTE = 21 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "SECONDS/32" MINIMUM = 0 MAXIMUM = 4294967295 DESCRIPTION = "Spacecraft time file was closed."END_OBJECT = COLUMNOBJECT = COLUMN NAME = FILENAME COLUMN_NUMBER = 7 START_BYTE = 25 BYTES = 40 DATA_TYPE = TEXT DESCRIPTION = "Filename of the file as it appeared onboard the spacecraft."END_OBJECT = COLUMN

7.4.2 CCSDS Primary Record HeaderOBJECT = BIT_COLUMN NAME = VERSION COLUMN_NUMBER = 1 START_BIT = 1 BITS = 3 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 0 DESCRIPTION = "CCSDS Version Number."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = PACKETTYPE COLUMN_NUMBER = 2 START_BIT = 4 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 0 DESCRIPTION = "Packet Type."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = SECHDRFLAG COLUMN_NUMBER = 3 START_BIT = 5 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 1 MAXIMUM = 1 DESCRIPTION = "Secondary Header Flag (1 = packet follows)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = APID

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COLUMN_NUMBER = 4 START_BIT = 6 BITS = 11 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 120 MAXIMUM = 122 DESCRIPTION = "Application Process ID (120 = primary science; 121 = secondary science; 122 = housekeeping)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = SEGFLAGS COLUMN_NUMBER = 5 START_BIT = 17 BITS = 2 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 3 MAXIMUM = 3 DESCRIPTION = "Packet Segmentation Flags."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = SEQCOUNT COLUMN_NUMBER = 6 START_BIT = 19 BITS = 14 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 16383 DESCRIPTION = "Sources Sequence Count (separate for each ApId)."END_OBJECT = BIT_COLUMNOBJECT = COLUMN NAME = PACKETLENGTH COLUMN_NUMBER = 7 START_BIT = 33 BITS = 16 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 441 DESCRIPTION = "Packet Length (number of bytes following primary header - 1)."END_OBJECT = COLUMN

7.4.3 CRaTER EDR Secondary Record HeaderOBJECT = BIT_COLUMN NAME = RESERVED1 COLUMN_NUMBER = 1 START_BIT = 1 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 0 DESCRIPTION = "Reserved (value = 0)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = TIME COLUMN_NUMBER = 2 START_BIT = 2 BITS = 31

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DATA_TYPE = UNSIGNED_INTEGER UNIT = SECONDS MINIMUM = 0 MAXIMUM = 2147483647 DESCRIPTION = "Spacecraft Time in Seconds (seconds elapsed since 1 January 2001)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = FRACTIME COLUMN_NUMBER = 3 START_BIT = 33 BITS = 4 DATA_TYPE = UNSIGNED_INTEGER UNIT = "1/16 SECONDS" MINIMUM = 0 MAXIMUM = 15 DESCRIPTION = "Spacecraft Time in Fractional Seconds (1/16 second units)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = RESERVED2 COLUMN_NUMBER = 4 START_BIT = 37 BITS = 5 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 0 DESCRIPTION = "Reserved (value = 0)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = TESTFLAG COLUMN_NUMBER = 5 START_BIT = 42 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "Test Mode Flag (1 = test enabled)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = ONEHERTZ COLUMN_NUMBER = 6 START_BIT = 43 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "External One Hertz time sync pulse (1 = not received)."END_OBJECT = BIT_COLUMNOBJECT = BIT_COLUMN NAME = SERIALNUMBER COLUMN_NUMBER = 7 START_BIT = 44 BITS = 5 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 31

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DESCRIPTION = "Instrument Serial Number."END_OBJECT = BIT_COLUMN

7.4.4 CRaTER EDR Primary Science RecordOBJECT = CONTAINER NAME = PRIMARYHDR COLUMN_NUMBER = 1 START_BYTE = 1 BYTES = 6 REPETITIONS = 1 ^STRUCTURE = "CCSDSHDR.FMT" DESCRIPTION = "CCSDS Primary Header, ApId = 120."END_OBJECT = CONTAINEROBJECT = CONTAINER NAME = SECONDARYHDR COLUMN_NUMBER = 2 START_BYTE = 7 BYTES = 6 REPETITIONS = 1 ^STRUCTURE = "CRATSECHDR.FMT" DESCRIPTION = "Secondary Header."END_OBJECT = CONTAINEROBJECT = CONTAINER NAME = EVENT COLUMN_NUMBER = 3 START_BYTE = 13 BYTES = 9 REPETITIONS = VAR ^STRUCTURE = "CRATEVENT.FMT" DESCRIPTION = "Signal recorded as a result of a single particle event." OBJECT = BIT_COLUMN NAME = EVENTAMP COLUMN_NUMBER = 1 START_BIT = 1 BITS = 12 DIM = 6 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Signal recorded by each of six detectors as a result of a single particle event." END_OBJECT = BIT_COLUMNEND_OBJECT = CONTAINER

7.4.5 CRaTER EDR Secondary Science RecordOBJECT = CONTAINER NAME = PRIMARYHDR COLUMN_NUMBER = 1 START_BYTE = 1 BYTES = 6 REPETITIONS = 1 ^STRUCTURE = "CCSDSHDR.FMT" DESCRIPTION = "CCSDS Primary Header, ApId = 121."END_OBJECT = CONTAINEROBJECT = CONTAINER

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NAME = SECONDARYHDR COLUMN_NUMBER = 2 START_BYTE = 7 BYTES = 6 REPETITIONS = 1 ^STRUCTURE = "CRATSECHDR.FMT" DESCRIPTION = "Secondary Header."END_OBJECT = CONTAINEROBJECT = CONTAINER NAME = SECONDARYFLGS COLUMN_NUMBER = 3 START_BYTE = 13 BYTES = 4 REPETITIONS = 1 DESCRIPTION = "Secondary Science Flags." OBJECT = BIT_COLUMN NAME = BIASCNTRL COLUMN_NUMBER = 1 START_BIT = 1 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "Detector Bias Delayed Control (1 = enabled)." END_OBJECT = BIT_COLUMN OBJECT = BIT_COLUMN NAME = BIASCMD COLUMN_NUMBER = 2 START_BIT = 2 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "Detector Bias Command (1 = on)." END_OBJECT = BIT_COLUMN OBJECT = BIT_COLUMN NAME = CALLOW COLUMN_NUMBER = 3 START_BIT = 3 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "Electrical Calibration Range Low (1 = enabled)." END_OBJECT = BIT_COLUMN OBJECT = BIT_COLUMN NAME = CALHIGH COLUMN_NUMBER = 4 START_BIT = 4 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "Electrical Calibration Range High (1 = enabled)." END_OBJECT = BIT_COLUMN OBJECT = BIT_COLUMN NAME = CALRATE COLUMN_NUMBER = 5

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START_BIT = 5 BITS = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "Electrical Calibration Rate (1 = 2K events/sec; 0 = 8 events/sec)." END_OBJECT = BIT_COLUMN OBJECT = BIT_COLUMN NAME = PROCDFLAG COLUMN_NUMBER = 6 START_BIT = 6 BITS = 1 DIM = 6 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 1 DESCRIPTION = "Detector Processing Enabled (1 = enabled)." END_OBJECT = BIT_COLUMN OBJECT = BIT_COLUMN NAME = LASTCMD COLUMN_NUMBER = 7 START_BIT = 12 BITS = 5 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 31 DESCRIPTION = "Address of Last Command to CRaTER." END_OBJECT = BIT_COLUMN OBJECT = COLUMN NAME = LASTVALUE COLUMN_NUMBER = 8 START_BIT = 17 BITS = 16 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 65535 DESCRIPTION = "Contents of Last Command to CRaTER." END_OBJECT = COLUMNEND_OBJECT = CONTAINEROBJECT = COLUMN NAME = DISCTHIN COLUMN_NUMBER = 4 START_BYTE = 17 BYTES = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 255 DESCRIPTION = "Low Level Discriminator for Thin Detectors (D1, D3, D5)."END_OBJECT = COLUMNOBJECT = COLUMN NAME = DISCTHICK COLUMN_NUMBER = 5 START_BYTE = 18 BYTES = 1 DATA_TYPE = UNSIGNED_INTEGER MINIMUM = 0

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MAXIMUM = 255 DESCRIPTION = "Low Level Discriminator for Thick Detectors (D2, D4, D6)."END_OBJECT = COLUMNOBJECT = COLUMN NAME = MASK COLUMN_NUMBER = 6 START_BYTE = 19 BYTES = 2 DIM = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 65535 DESCRIPTION = "Discriminator Accept Mask (64 bits)."END_OBJECT = COLUMNOBJECT = COLUMN NAME = SINGLE COLUMN_NUMBER = 7 START_BYTE = 27 BYTES = 2 DIM = 6 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 65535 DESCRIPTION = "Detector Singles Counter (one for each of 6 detectors)."END_OBJECT = COLUMNOBJECT = COLUMN NAME = GOOD COLUMN_NUMBER = 8 START_BYTE = 39 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 65535 DESCRIPTION = "Good Events Counter."END_OBJECT = COLUMNOBJECT = COLUMN NAME = REJECT COLUMN_NUMBER = 9 START_BYTE = 41 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 65535 DESCRIPTION = "Rejected Events Counter."END_OBJECT = COLUMNOBJECT = COLUMN NAME = TOTAL COLUMN_NUMBER = 10 START_BYTE = 43 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER MINIMUM = 0 MAXIMUM = 65535 DESCRIPTION = "Total Events Counter."END_OBJECT = COLUMN

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7.4.6 CRaTER EDR Housekeeping RecordOBJECT = CONTAINER NAME = PRIMARYHDR COLUMN_NUMBER = 1 START_BYTE = 1 BYTES = 6 REPETITIONS = 1 ^STRUCTURE = "CCSDSHDR.FMT" DESCRIPTION = "CCSDS Primary Header, ApId = 122."END_OBJECT = CONTAINEROBJECT = CONTAINER NAME = SECONDARYHDR COLUMN_NUMBER = 2 START_BYTE = 7 BYTES = 6 REPETITIONS = 1 ^STRUCTURE = "CRATSECHDR.FMT" DESCRIPTION = "Secondary Header."END_OBJECT = CONTAINEROBJECT = COLUMN NAME = V28BUS COLUMN_NUMBER = 3 START_BYTE = 13 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.00101*MOD(DN,4095)" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Least significant 12 bits: Spacecraft 28VDC bus voltage; most significant 4 bits: FPGA revision code."END_OBJECT = COLUMNOBJECT = COLUMN NAME = V5DIGITAL COLUMN_NUMBER = 4 START_BYTE = 15 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.00200*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "+5VDC digital regulated voltage."END_OBJECT = COLUMNOBJECT = COLUMN NAME = V5PLUS COLUMN_NUMBER = 5 START_BYTE = 17 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.00200*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Least significant 12 bits: +5VDC analog regulated voltage; most significant 4 bits: 0xf if analog voltage is absent (and remaining h/k fields are invalid), 0x0 otherwise."END_OBJECT = COLUMNOBJECT = COLUMN

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NAME = V5NEG COLUMN_NUMBER = 6 START_BYTE = 19 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.00201*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "-5VDC analog regulated voltage."END_OBJECT = COLUMNOBJECT = COLUMN NAME = I28BUS COLUMN_NUMBER = 7 START_BYTE = 21 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "AMPS = 0.000198*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Instrument current drain off spacecraft bus."END_OBJECT = COLUMNOBJECT = COLUMN NAME = BIASCURRENT COLUMN_NUMBER = 8 START_BYTE = 23 BYTES = 2 DIM = 6 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "AMPS = 0.00000000050*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Detector bias current."END_OBJECT = COLUMNOBJECT = COLUMN NAME = BIASVOLTTHIN COLUMN_NUMBER = 9 START_BYTE = 35 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.101*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Thin detector (D1, D3, D5) bias voltage."END_OBJECT = COLUMNOBJECT = COLUMN NAME = BIASVOLTTHICK COLUMN_NUMBER = 10 START_BYTE = 37 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.101*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Thick detector (D2, D4, D6) bias voltage."END_OBJECT = COLUMNOBJECT = COLUMN NAME = CALAMP COLUMN_NUMBER = 11

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START_BYTE = 39 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.00100*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Electrical calibration voltage amplitude."END_OBJECT = COLUMNOBJECT = COLUMN NAME = LLDTHIN COLUMN_NUMBER = 12 START_BYTE = 41 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.00124*DN - 0.124" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Low Level Discriminator voltage for thin detectors (D1, D3, D5)."END_OBJECT = COLUMNOBJECT = COLUMN NAME = LLDTHICK COLUMN_NUMBER = 13 START_BYTE = 43 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "VOLTS = 0.00124*DN - 0.124" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Low Level Discriminator voltage for thick detectors (D2, D4, D6)."END_OBJECT = COLUMNOBJECT = COLUMN NAME = TTELESCOPE COLUMN_NUMBER = 14 START_BYTE = 45 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "CELSIUS = 0.2*V5plus - 0.100*DN - 273.2" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Temperature of telescope assembly."END_OBJECT = COLUMNOBJECT = COLUMN NAME = TANALOG COLUMN_NUMBER = 15 START_BYTE = 47 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "CELSIUS = 0.2*V5plus - 0.100*DN - 273.2" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Temperature of analog electronics."END_OBJECT = COLUMNOBJECT = COLUMN NAME = TDIGITAL COLUMN_NUMBER = 16 START_BYTE = 49

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BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "CELSIUS = 0.2*V5plus - 0.100*DN - 273.2" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Temperature of digital electronics."END_OBJECT = COLUMNOBJECT = COLUMN NAME = TPOWER COLUMN_NUMBER = 17 START_BYTE = 51 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "CELSIUS = 0.2*V5plus - 0.100*DN - 273.2" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Temperature of regulate power supply."END_OBJECT = COLUMNOBJECT = COLUMN NAME = TREF COLUMN_NUMBER = 18 START_BYTE = 53 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "CELSIUS = 0.2*V5plus - 0.100*DN - 273.2" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Temperature of reference location on telescope wall."END_OBJECT = COLUMNOBJECT = COLUMN NAME = RADHIGHSENS COLUMN_NUMBER = 19 START_BYTE = 55 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "RADS = 0.00000125*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "High Sensitivity Radiation monitor voltage."END_OBJECT = COLUMNOBJECT = COLUMN NAME = RADMEDSENS COLUMN_NUMBER = 20 START_BYTE = 57 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "RADS = 0.000320*DN" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Medium Sensitivity Radiation monitor voltage."END_OBJECT = COLUMNOBJECT = COLUMN NAME = RADLOWSENS COLUMN_NUMBER = 21 START_BYTE = 59 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "RADS = 0.08192*DN"

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MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Low Sensitivity Radiation monitor voltage."END_OBJECT = COLUMNOBJECT = COLUMN NAME = TPRT COLUMN_NUMBER = 22 START_BYTE = 61 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "CELSIUS = 0.1299*(4*DN-10000)/(5-DN/1000)" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Temperature of reference location on instrument chassis (ground test only)."END_OBJECT = COLUMNOBJECT = COLUMN NAME = PURGE COLUMN_NUMBER = 23 START_BYTE = 63 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER UNIT = "CUBIC FEET PER HOUR = 0.25*(DN-V5plus)/2" MINIMUM = 0 MAXIMUM = 4095 DESCRIPTION = "Flow rate of GN2 purge (ground test only)."END_OBJECT = COLUMN