ESAC June 9-11 2008 R. Noschese G.Picardi, R. Orosei, A. Cicchetti, S. Giuppi, M. Cartacci

ESAC

June 9-11 2008

R. Noschese

G.Picardi, R. Orosei, A. Cicchetti, S. Giuppi , M. Cartacci

Marsis data flow L1B

•FRM_SSX_TRK_CMP•GEO

L2 • Data Structure

GEO_MARS

Subsurface data sets•MEX-M-MARSIS-2-EDR-V1.0•MEX-MMARSIS-3-SS-V1.0

===========“Topics”===========

==============="MARSIS' DATA STRUCTURE"=============== 2

==============="MARSIS' DATA STRUCTURE"===============

L1BPDS format

L2PDS format

Signal Processing

=========== MARSIS data flow ===========

MEX-M-MARSIS-2-EDR-V1.0MEX-M-MARSIS-3-SS-V1.0

PVV tool &

NASAView

Delivery to the PSA

TM & TCBY ESOC

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Operative Mode

CALRXOAISSS1SS2SS3SS4SS5

=========== The MARSIS data product ===========

Instrument State

ACQTRK

MARSIS data are organized into groups, so called frames. The generic frame is the result of the on board processing of a certain number of raw echoes.

Marsis has more Data collection ModesMarsis has more Data collection Modes

Processing

INDRAWCMP

The content of the frame depends on the operative mode.For SSx only the frame content depends also on the state of the instrument and on the processing performed on the data.

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=========== Data Products ===========

Data Products are composed by two files. Frame file (FRM) – FRM_SSX_TRK_CMP_EDR_XXXX.DAT

Geometry file (GEO) –GEO_SSX_TRK_CMP_EDR_XXX.DAT

The second contains geometrical information used to locate observations in space and time; one record for each frame in the corresponding FRM file. The columns of the table contains the values of the parameters describing the geometry of the observation for the corresponding frame.

The first contains the instrument science data , as they were collected by the instrument.Each frame corresponds to a record in the Data Product that contains all frames acquired using the same instrument mode, in the same instrument state and after the same type of on-board processing during a single orbit.

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HEADER

LABEL

Scientific DATA

PIS

1 Frame

|||

HEADER

Scientific DATA

PIS

n Frame

=========== L1B : FRM_SS3_CMP ===========

HEADER

Scientific DATA

PIS

2 Frame

1 Record

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=========== Geometry file ===========

LABEL

DATA

DATA

||||||

1 Record

2 Record

n Record

HEADER

LABEL

DATA

PIS

|||

HEADER

DATA

PIS

HEADER

DATA

PIS

1 Frame

2 Frame

n Frame

DATA

FRM file GEO file

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PDS LABELPDS LABEL

PDS label has a standard structure that consist of keywords set organised into groups.

PDS label has a standard structure that consist of keywords set organised into groups.

RECORD_BYTESLABEL_RECORDS

FOOTPRINT_POINT_LATITUDE FOOTPRINT_POINT_LONGITUDE

RECORD_BYTESLABEL_RECORDS

FOOTPRINT_POINT_LATITUDE FOOTPRINT_POINT_LONGITUDE

===========“L1B : LABEL”===========

label length

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===========“ LABEL Structure”===========

FOOTPRINT_POINT_LATITUDEFOOTPRINT_POINT_LONGITUDE

They give an indication of the position of the observations These keywords allow to define each observation present in a “product”.

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For example, let ‘s assume a orbit planned in this way:For example, let ‘s assume a orbit planned in this way:

===========“ LABEL structure”===========

A1

A0

A2

B1

B2

B0

SS3

SS2

SS3

AIS

AIS

these observations are defined by at least a “start” and an “end” point.

FOOTPRINT_POINT_LATITUDE = ((A1LAT, A0LAT, A2LAT),(B1LAT,B0LAT,B2LAT))

FOOTPRINT_POINT_LONGITUDE = ((A1LON, A0LON, A2LON),(B1LON,B0LON,B2LON))

these observations are defined by at least a “start” and an “end” point.

FOOTPRINT_POINT_LATITUDE = ((A1LAT, A0LAT, A2LAT),(B1LAT,B0LAT,B2LAT))

FOOTPRINT_POINT_LONGITUDE = ((A1LON, A0LON, A2LON),(B1LON,B0LON,B2LON))

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Ancillary Data describing the instrument settings during data acquisition.

Ancillary Data describing the instrument settings during data acquisition.

28 BytesAncillary Data

228 BytesAuxiliary Data

HEATHER

Auxiliary Data rappresent the values of the parameters used in the on-board software processing. The exact content of the auxiliary data depends on the instrument mode.

Auxiliary Data rappresent the values of the parameters used in the on-board software processing. The exact content of the auxiliary data depends on the instrument mode.

=========== Frame Structure ===========

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=========== Frame Structure ===========

Operative Mode

Antenna Frequency Filters Frame length

(BYTES)

SS1 Dipole & Monopole

F1 &F2 0 4864

SS2 Dipole F1 &F2 Multi-look 2048

SS3 Dipole F1 &F2 -1 0 1 6912


F1 -2 -1 0 1 2 11008


F1 -1 0 1 6912

The number of echoes in the frame varies with the instrument mode and depends on the antenna used to receive the echoes and on the number of different frequencies transmitted by the radar.

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DIPOLE DIPOLE

Doppler Filter-1 0 1

Doppler Filter-1 0 1 Doppler Filter

-1 0 1


512 (8 bit RE)

512 (8 bit IM)

512 (8 bit RE)

512 (8 bit IM)

512 (8 bit RE)

512 (8 bit IM)

512 (8 bit RE)

512 (8 bit IM)

512 (8 bit RE)

512 (8 bit IM)

512 (8 bit RE)

512 (8 bit IM)

F1F1

F2F2

PISPIS

512 byte(16 bit RE)

512 byte(16 bit RE)

=========== Frame Structure ===========

The scientific data of a frame are ordered according to the time of acquisition, to the antenna which are receved, by the trasmitted band and by the Doppler filter

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The L2 Data Product have an identical structure as described for the compressed L1b data product.A Data Product contains all frames acquired using the same instrument mode in tracking (TRK) state, during a single orbit.

The L2 Data Product have an identical structure as described for the compressed L1b data product.A Data Product contains all frames acquired using the same instrument mode in tracking (TRK) state, during a single orbit.

=========== Data Product Structure: L2 =========

28 bytesAncillary Data

228 bytesAuxiliary Data

Scientific DATA PIS

All processed echoes are 512 samples long. The processed radar echo is a complex quantity, contained in two vectors of 512 32-bit floating point values, the first of which represents the modulus of the echo, while the second contains the echo phase.

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DIPOLE DIPOLE


Doppler Filter-1 0 1 Doppler Filter

-1 0 1


512 (32 bit

Module)

512 (32 bit Phase)

512 (32 bit

Module)

512 (32 bit Phase)

512 (32 bit

Module)

512 (32 bit Phase)

512 (32 bit

Module)

512 (32 bit Phase)

512 (32 bit

Module)

512 (8 bit

Phase)

512 (8 bit

Module)

512 (8 bit

Phase)

F1F1

F2F2

=========== Data Structure: L2 ===========

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The main objective of the GEO_MARS file is to describe the geometry associated with a data Product. The geo_mars will describe each observation using a set of “lines” to describe the shape of the footprint.Each line will be defined by identifing two points. The footprint will be reconstructed by joining all the left-hand points to get the left side of the footprint and all the right-hand points to get the right side.The center of that line is defined as the geometrical center point inlatitude and longitude, as seen from the instrument.

The GEO_MARS file has the following information: Line Description Parameters Non-geometrical Parameters Position Generic Parameters Solar related Parameters Spacecraft related Parameters Instrument Viewing related Parameters

=========== GEO_MARS =========

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The GEO_MARS file contains all Information about the orbits of the Data Set and for each orbit there is a number of “line” equal to the number frames.

The GEO_MARS file contains all Information about the orbits of the Data Set and for each orbit there is a number of “line” equal to the number frames.

=========== GEO_MARS =========

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.PDSVOLUME.XMLVOLDESC.CATAAREADME.TXT

DATA CALIB LABEL INDEX CATALOG DOCUMENT

“MEX-M-MARSIS-2-EDR-V1.0”

CATINFO.TXTDATASET.CATMISSION.CATPERSON.CATREFERENCE.CATRELEASE.CATSOFTWARE.CATINSTRUMENT.CATINSTRUMENT_HOST.CAT

Type Mode State Form Product Orbit Extension

FRM CAL ACQ RAW EDR xxxx .DAT

GEO AIS TRK IND

SSX CMP

EDRXXXXEDRXXXX

LOG_EDR_XXXX.CSVLOG_EDR_XXXX.LBLMARSIS_APID20_C_XXXX.CSVMARSIS_APID20_C_XXXX.LBLMARSIS_APID20_T_XXXX.CSVMARSIS_APID20_T_XXXX.LBLMARSIS_APID20_V_XXXX.CSVMARSIS_APID20_V_XXXX.LBL

FRM….EDR.FMTGEO_EDR.FMT

GEO_MARS.TABGEO_MARS.LBLINDEX.TABINDEX.LBL

DOCINFO.TXT

The DATA directory contains the FRM and GEO files. Data files are organised into subdirectories, each containing data collected over ten orbits.


=========== Marsis Data Set: L1b=========

The documentation describes the mission, the spacecraft, the instrument, and the data set. It includes the references to published science papers .

The CALIB directory is organized into subdirectories according to the same scheme used for the subdirectories in the DATA directory. The CALIB directory contains files CSV and LBL extensionThe files LBL describe the fields , including their format and length present in CSV file.

MARSIS_APID……These files report currents, temperatures and voltages measured in the instrument during a single orbit.

LOG_EDR…These files report a number of parameters describing the instrument setup and performance for observations collected during a single orbit.

The LABEL directory contains the files FMT extension. The content of these files is the description ,the format and length of the FRM and GEO fields .There is one file for each Data Product file type.

The Index table are generated by PVV tool and they are provided with detached PDS label files.Also GEO_MARS file is provided with detached PDS label file.



“MEX-M-MARSIS-2-EDR-V1.0”

CATINFO.TXTDATASET.CATMISSION.CATPERSON.CATREFERENCE.CATRELEASE.CATSOFTWARE.CATINSTRUMENT.CATINSTRUMENT_HOST.CAT


FRM CAL ACQ RAW EDR xxxx .DAT

GEO AIS TRK IND

SSX CMP

EDRXXXXEDRXXXX

LOG_EDR_XXXX.CSVLOG_EDR_XXXX.LBLMARSIS_APID20_C_XXXX.CSVMARSIS_APID20_C_XXXX.LBLMARSIS_APID20_T_XXXX.CSVMARSIS_APID20_T_XXXX.LBLMARSIS_APID20_V_XXXX.CSVMARSIS_APID20_V_XXXX.LBL

FRM….EDR.FMTGEO_EDR.FMT

GEO_MARS.TABGEO_MARS.LBLINDEX.TABINDEX.LBL

DOCINFO.TXT


=========== Marsis Data Set: L1b=========



“MEX-M-MARSIS-3-RDR-SS-V1.0”


FRM CAL ACQ RAW RDR xxxx .DAT

GEO SSX TRK IND

CMP

RDRXXXXRDRXXXX

LOG_RDR_XXXX.CSVLOG_RDR_XXXX.LBL

FRM….RDR.FMTGEO_RDR.FMT

INDEX.TABINDEX.LBLGEO_MARS.TABGEO_MARS.LBL


=========== Marsis Data Set: L2=========

Documents

ESAC June 9-11 2008 R. Noschese G.Picardi, R. Orosei, A. Cicchetti, S. Giuppi, M. Cartacci