AD-RI62 718 ON-ORBIT SUPPORT OF DARP-301 PRYLOAD(U) LOCKHEED 1/1MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTORESEARCH LAB W L IMHOF ET AL. 12 NOV 85 LMSC/'F@67B35

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12 November 1985

ON-OBIT FINAL REPORT

ON-OBITSUPPORT OF DARPA-301 PAYLOADCONTRACT NOO1-85-C-0429

Submitted To:

Department of the NavyOffice of Naval Research800 North Quincy Street

Arlington, Virginia 22217

W. L. ImhofJ. Mobilia--D. W. DatloveG. H. Nakano4 Q3 4

E . R. Gaines L-J. P. McGlennon

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s t c m t £ A M I t C O U S F T I A E T I I P A G E R E ADe I N S R U C T I O NS__ _ _ _ _ _ _ _

REPOT DCUMNTATON AGEBEFORE COMPLETING FORMNUMBE GOVT AC tPd 2. RECIPIENT'S CATALOG NUMBER

LIISC/707835-

4. ITLE (so &"do)~ a. TYPE OF REPORT a PERIOD COVEREDnal ReportFia

On-Orbit Support of DARPA-301 Payload - Sept. 30, 1985Contract 1100014-S5-C-0429 6. PERFORMING OR(;. REPORT NME

1AUTHOR@) S. CONTRACT ORt GRANT NUMBER(*)

W.L. Imhof, J. Nobilia, D.V. Datlowe, Gil. Nakano, N00014-85-C-0429Z.I. Gaines, 3.?. HcGlennon

9. PERFORMING ORGANIZATION MNS AND ADDRESS 10. PROGRAM ELEMENT. PROJECT. TASKLockeedPaloResarchLabratoiesAREA & WORK UNIT NUMBERSLockeedPaloResarchLabratoiesTask Area NR 321-033(B)

3251 Hanover St.. B255, D91-20Palo Alto, CA 94304

$I. CONTRtOLLING OFFICE NAME AND ADDRECSS IS. REPORT DATEMr. R. G. Joiner, Office of Naval Research 1 oebr18Code 414 I2. NUMBER Of PAGES800 North Quincy Street

U~f Q~aI~ ~ A~p&E53(l 0011.9 1er C011-811008 OIfa*.J Ill. SECURITY CLASS. (of Ohio report)

Depatmen ofthe avyUnclass.

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16. DISTRIBUION STATEMENT (of Woa Aepal1)

Unlimited distribution - - Approved for public release and sale.

47. DISTRIBUTION STATEMENT (of Ohe abaeire .ntmrd in Block 20. It t11110ent from, Report)

IS. SUPPLEMENTARY NOTES

IS. KEY WORDS (Cmtnsto an 10vwo* side It necomeU7 and identify by block nuimber)

* Flight Data Tapes, Quick-Look Analyses, .On-Orbit Operations, Mapping Gamma-RaySources

20. ABSTRACT (Coninue an uovao old., If necessary and Identify by block numb~t)

This report covers the activities in support of the DARPA-301 payload on theP78-1 satellite. Until the middle of September 1985 several high-sensitivity

* gSama-ray detectors continued to perform well and were completely capable offulfilling the mission objectives. Examples of on-orbit data are given.

DD FOR 1473 EDITION DO, I Nov 65 is oUsoLET'E UNCLASSIFIEDSECURITY CLASS&PICATION OF THIS PAGE (Whon Der& Entrd

LKSC/F067835

I. INTRODUCTION

report covers the activities In support of the DARPA-301 payload on

the P78-1 satellite. Until the middle of September 1985 several high-

semitivity mis-ray detectors continued to perform vell and were completely

capable of fulfilling the mission objectives. These objectives were:

A) Provide the technical planning and liaison vith the Air Force Satellite

Control Facility and other governsent agencies as required for the

on-orbit satellite support of the DARPA-301 payload .

B) Assess the on-orbit operation and quality of data from the DARPA-301

payload on the P78-1 satelllte'

C) Provide support, Including quick-look analysis and interactions vith the

Air Force-Satellite Control Facility, for a regional eventj ,

D) Perform regular analyses of the on-orbit data to maintain updated

evaluations of the sensitivities and optimum configurations of the

payload for mapping Sam-ray sources. ,4 w-veg :i

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HIo TSWICAL PLANNING AND LIAISON WITH SATELLITE CONTROL FACILITY,. ' ,

luring the course of this prosrs we interacted with the Satellite Control

Facility on almost a daily basis. Many of these interactions were by telephone,

but one or more representatives of the Space Sciences Laboratory generally went

to the Satellite Control Facility (SCF) once a week. On these visits the status

of the satellite was considered in detail and we often made suggestions for

future action. The operation of the DARPA-301 payload was discussed. The

electrical conf iguration of the entire payload was also changed on occasion to

balance the spacecraft power loads. In addition, on a weekly basis several

"quick-look" tapes were generally picked up and taken back to the Palo Alto

Laboratory for processing.

We also participated in a variety of special meetings, and, when appro-

priate, coments and recommendations were made. These meetings were held at the

Space Sciences Laboratory or at the SCF and they involved personnel from the

SC?, the Air Force STP Office, and Lockheed.

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LMSC/F067835

Ills *8535 OW-CIT OPERTIONS AND QUALITY OF DATA

On a regular basis, often once a week or sore frequently, the flight dota

tapes were subjected to quick-look analyses. These analyses were generally

based on strip-chart plots of the various instrument outputs. In this manner

the general quality of the flight data vas assessed, and the instrument perfor-

sme sometiam subjected to a detailed evaluation. An example of these strip

charts Is shown in Figure 1.

On occasion we were asked by the mission team at the Satellite Control

Facility to process special playback tapes in order to assess the quality of the

data received. These special operations have Involved each of the tracking

stations at various times. As with most of the quick-look data a special effort

was often made to Insure that the turnaround time from receipt of the tapes to

completion of the quick-look processing vas less than 2-3 days.Aw0

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LMSC/F067835

two RIWIAL KYITS -. 4

Although there was no regional event coverage during the time period

covered by this report, data were regularly recorded once each day and night in

the region of Interest. These data provided good Information on the background

levels and would have been very Important for evaluating flight data during a ~~~

regiona' event.

We also kept In touch with the customer to be aware of any anticipated

special coverages so that the payload conf iguration could always be in an

optimized condition.

There was one opportunity for special coordinations involving the DARPA-301

payload. The necessary ephemeris runs were made and the payload set in a mode

to record at the appropriate times, but the results were negative.

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Vo AMLMYSIS OF O-UlT DATA 4.

The key instruments in the DAIRPA-301 payload for fulfilling the mission at

the times of interest were the highest sensitivity giam-ray detectors. These

proved to be the large sodium iodide antlcoincidence shields surrounding the

germanium spectrometers. As discussed below they were still performing to the

end of the mission.

Four to six of the GINS 002 cadmium telluride spectrometers operated

steadily, but two of then at times displayed intermittent action. In addition,

the cesium iodide anticoincidence counters surrounding the cadmium telluride

sensors were still performing and these were very sensitive for the detection of

gama-ray sources in the atmosphere. The two GINS 001 cesium iodide scintil-

lators were no longer operational, but comparable sensitivities were achieved

with the anticolur.dence counters around the cadmium telluride sensors and the

germanium spectrometers.

When the flight data were surveyed for general quality, the outputs of

Individual Lastruments were also studied in detail to determine their sensitiv-

ites for mapping gams-ray sources. Brensstrahlung x-ray sources, which are

often present in the high latitude regions of the auroral zone, proved to be

very useful in evaluating the response of the GEMS 2 spectrometers to x-rays.

Examples of the strip charts for an unusually strong event are shown in Figure 2

and 3. More detailed plots of the performance of each of the GEMS counters are

shown in Figure 4.

The solid state spectrometers (EEM 002, PRM 004, LEP 002) used for

measuring electrons and protons were still performing well until the end of the

mission. The gain of the EEM solid state detector was monitored with a radio-

active in-flight calibration source. An example of one of the calibrations of

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LMSC/F067835

the M spectrometer is shown in Figure 5. The channel umber in which the2--1

An1 calibration peak appears Is plotted In Figure 6 as a function of time. It

ean be seen that the gain remained constant to within 2 percent throughout the

mission. The 3K 002 spectrometer was probably the most useful of the particle

detectors for the missions of prime interest in that it served to monitor the

local electron background and also could measure in detail with high sensitivity

any injected electrons.

Exmples of the 3M1 response are provided in Figures 7 and 8. The trapped,

precipitating, and backscattered electron fluxes are shown for a portion of an h

orbit. Examples of the energy spectra are shown in Figure 9. Similar outputs

of the IEP detector response are plotted in Figures 10 and 11.

VI. SUDUIART

In smmary, we provided on-orbit support of the DARPA-301 payload through

part of September 1985, During that period the instruments were capable of

satisfying the mission objectives.

ACKNOVLIDGEETS

The efforts of Mr. C. K. Chalmers and K. Van Stone in processing the DARPA

301 data are greatly appreciated. Consultations with Dr. H. D. Voss are also

acknowledged.

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LKSC/F067835

Figure 1. An eenaple of a strip chart showing selected outputs of the DARPA-

301 payload on the P78-1 satellite. orbt u r e

Figure 2. Selected outputs of the DARPA-301 payload during a strong brems-

strablung x-ray event.

Figure 3. Selected outputs of the DARPA-301 payload during a strong breas-

strablung x-ray event,

Figure 4. Output of the indiviual GM 2 detectors during the x-ray event

shown in Figure 3.

Figure 5. Example of the electron energy spectrum measured in the MED spectro-

meter during a calibration mode.

Figure 6. The calibration peak channel amber plotted as a function of time

for the entire uission.-

, Figure 7. The ZKN spectrometer counting rates during a portion of an orbit.

Tines In the calibration mode are Indicated.

Figure 8. The 1M4 spectrometer counting rates during a portion of an orbit.

Figure 9. Kimples of the electron energy spectra measured in the KEN spectro-

meter.

Figure 10. The LEP spectrometer counting rates during a portion of an orbit.

Figure 11. The LIP spectrometer counting rates during a portion of an orbit.

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