! File: 3131C.PROP ! Database: PEPDB ! Date: 18-FEB-1994:18:41:19 coverpage: title_1: SA FEATHERING TEST proposal_for: ENG pi_fname: J pi_lname: DECKER pi_inst: CODE 440 pi_country: USA num_pri: 1 ! end of coverpage abstract: line_1: Thermal gradients on the SA bi-stems have been line_2: analytically implicated as the primary source of vehicle line_3: disturbances during every HST orbit at night-day and day-night line_4: transition. This test will reconfigure the SAs to a series line_5: of off-nominal configurations and observe/record the line_6: resulting vehicle disturbances at the critical times. line_7: The data will confirm or refute the postulated disturbance line_8: sources within the SA assemblies, and will reveal the line_9: unique disturbance contributions of the +/- V2 SA's. line_10: This test data will characterize any changes required line_11: in the design of the replacement SA's. ! ! end of abstract general_form_proposers: lname: DECKER fname: J. inst: GFSC country: USA esa: X ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: This test will provide data concerning the behavior of the line_2: vehicle during critical times of the orbit of the arrays line_3: in off-nominal configurations that will confirm or refute line_4: the postulated disturbances sources within the SA line_5: assemblies, and will reveal the unique disturbance contrib- line_6: utions of the +V2 and -V2 SA's. This info. cannot be line_7: obtained by any means other than an on-orbit test involving line_8: off-nominal SA config's. The data will be used to determine line_9: any modifications to the design of the replacement SAs line_10: which are required to minimize the SA induced disturbances. ! question: 3 section: 1 line_1: This test will be conducted with the HST in Normal Mode line_2: using gyros for attitude reference. The +V1 will be pointed line_3: toward the sun. The battery Rate of Charge (ROC) safemode line_4: test must be disabled during the entire test; the SA normal line_5: Sun Angle Safemode test will be disabled during specific line_6: parts of the test by real time commands and then enabled line_7: during the test. The disabled tests, with the exception line_8: of the battery ROC will be re-enabled at the start of line_9: Test Seq. 7 as listed below. The ROC test cannot be enabled line_10: until at least 4 more orbits. All critical data e.g format line_11: PN data, will be downlinked in realtime when possible, and line_12: recorded on the ETR as a backup, and will be dumped to the line_13: STOCC to ensure that all critical data are available for line_14: either real time or near-real time analysis. line_15: The nominal orientation of th SAs for this test is an angle line_16: of +90 degs. This test consists of series of SA positioning line_17: slews that a) place the the -v2 wing 'edge-on' to the sun; line_18: b) place the +v2 wing 'edge-on' to the sun; c) simulta- line_19: neously place the wings at an agle of 6 degs off nominal; line_20: d) place both wings 'edge-on' to the sun. At least one line_21: 15-min forward link contact is required during the time line_22: that one or both wings are in the 'edge-on' configuration line_23: to enable the wings to be commanded back to the nominal ! question: 3 section: 2 line_1: orientation in the event that the any problems are en- line_2: countered; these are designated as critical forward link line_3: service. The foregoing test configurations will be line_4: maintained thruout one night/day, orbit day, day/night line_5: transition cycle; the wings will be slewed back to the line_6: nominal orient. after the tests at all configurations line_7: EXCEPT c). The wings will be slewed back to the test line_8: configurations using realtime commands and will be slewed line_9: back to the nominal orientation using stored commands. line_10: Test configs a), b), c) and d) must be established no line_11: later than 15 mins prior to a nite/day transition. 2 line_12: opportunities for sending the commands to establish the line_13: configuration with the +v2 wing 'edge-on' to the sun, line_14: and 2 for sending the commands to establish the config's. line_15: for both wings 'edge-on' to the sun, are provided to ensure line_16: that the config's can be established prior to a nite/day line_17: transition in the event that the first opportunity is line_18: missed. The wings should be slewed back to nominal orient. line_19: no sooner than 15mins after teh day/nite transition for line_20: configurations a), b), and d). line_21: A recovery period is required after the test at each line_22: configuration to permit the battery SOC toreturn to the line_23: level that prevailed at the start of the test at that ! question: 3 section: 3 line_1: particular config. The slew of both winds to an orient. of line_2: 6 degs off nominal should be scheduled to occur after the line_3: 2nd recovery orbit following the test of the +v2 wing in line_4: 'edge-on' orient. The slew to 6-degs must be timed such line_5: that its mid-point coincides with a nite/day transition line_6: The slew will be executed with the SA brake off to line_7: determine any changes in vehicle response. The config's. line_8: at 6 deg's will be maintained thruout the next orbit day line_9: and day/nite transition; both wings will then be slewed line_10: to the 'edge-on' config. w/o first being slewed back to the line_11: nominal orientation. The sequence of test config's, the line_12: # of orbits for each configuration, are given below: line_14: TEST ARRAY POSITION # ORBITS/SEQUENCE line_15: SEQ. +v2 -v2 line_16: 1 90 0 2 line_17: 2 90 90 3 line_18: 3 0 90 1 line_19: 4 90 90 2 line_20: 5 84 84 1 line_21: 6 0 0 1 line_22: 7 90 90 2+ ! question: 3 section: 4 line_1: During the test sequence, the thermal data and line_2: potentiometer data contained in telemetry format AN, and line_3: the PCS data contained in telemetry format PN to be used line_4: to further characterize the SA-induced attitude distur- line_5: bance problem will be collected according to the following line_6: schedule. All the data collected are to be recorded at all line_7: times; however data straddling the nite/day and day/nite line_8: transitions are desired in realtime to the max. extent line_9: possible. line_10: TEST SEQ ORBITS FORMAT line_11: 1 1 AN line_12: 2 PN line_13: 2 1,3 AN line_14: 2 PN line_15: 3 1 PN line_16: 4 1 AN line_17: 2 PN line_18: 5 1 PN line_19: 6 1 PN line_20: 7 1,2 AN ! question: 4 section: 1 line_1: HST gryo assembly data will be analyzed in time and line_2: freq. domains using PSD's. These results will be line_3: correlated to the SA config's wrt the vehicle,and line_4: and to the vehicle config. wrt to the sun. The data line_5: will be compared to the predicted behavior of each line_6: array individually, and both together. ESA, GFSC and line_7: lmsc-w will participate in the analysis of the results. line_8: LMSC-W will process the data and issue a report. ! !end of general form text general_form_address: lname: DECKER fname: J. category: PI inst: GFSC ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: SEP descr_1: S.ECLIPTIC POLE pos_1: RA = 89.4642D +/- .01", pos_2: DEC = -64.48596D +/- .01" equinox: 1990 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: SEP config: S/C opmode: POINTING aperture: V1 num_exp: 1 time_per_exp: 1S fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: SEQ 1- 33 NO GAP; req_4: CYCLE 0 / 1-33; comment_1: SLEW TO TARGET SEP VIA comment_2: STORED COMMANDS ! linenum: 2.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 20M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: AFTER 1 BY 10M+/-5M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: UPLINK LAUNCH VAL'S OF PCS comment_2: ACQ. GAINS. NEXT PATCH DF- comment_3: 224 SFFCHG TO 450 AMP-HRS comment_4: AND ONN RLM TO 15DEGS. comment_5: DISABLE SA SUN ANGLE comment_6: AND BATTERY ROC TEST ! linenum: 3.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 20M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: COMMAND -V2 WING TO 0DEG comment_2: VIA PSTOL SASLEW(0,0). comment_3: GET -V2/0 CONFIG NO LATER comment_4: THAN 10M PRIOR TO NITE/DAY comment_5: X'ING. +V3 AXIS TO SUN AND comment_6: START 10M+/-5M AFTER NOON ! linenum: 4.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: AFTER 3 BY 15M+/-5M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: BACKUP COMMAND FOR -V2 WING comment_2: TO 0 DEG VIA PSTOL SASLEW. comment_3: GET -V2/0 CONFIG NO LATER comment_4: THAN 10M PRIOR TO NITE/DAY comment_5: X'ING. IFF 3 FAILS, START comment_6: 4 @10+/-5M PRE-ORBIT NITE ! linenum: 5.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 96M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; req_2: AFTER 4 BY 30M+/-5M; comment_1: COLLECT/REC FORMAT comment_2: 'AN' DATA FROM LINE 5 comment_3: TO 7. ! linenum: 6.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: AFTER 5 BY 45M+/-5M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: CONTACT REQ'D FOR comment_2: CONTINGENCY. ! linenum: 7.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 51M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; ! linenum: 8.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 30M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=PN req_1: CRIT OBS; comment_1: COLLECT/REC FORMAT comment_2: 'PN' DATA FROM LINE 7 comment_3: TO 9. ! linenum: 9.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=PN req_1: AFTER 8 BY 45M+/-5M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: CONTACT REQ'D FOR comment_2: CONTINGENCY. ! linenum: 10.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 51M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; comment_1: COLLECT/RECORD DATA comment_2: IN AN FORMAT ! linenum: 11.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 96M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; comment_1: SLEW BOTH WINGS VIA comment_2: STORED COMMANDS TO comment_3: 90DEGS. ! linenum: 12.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: COMMAND TO DUMP ETR ! linenum: 13.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 81M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; ! linenum: 14.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 96M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=PN req_1: CRIT OBS; comment_1: COLLECT/REC DATA comment_2: IN 'PN' FORMAT. ! linenum: 15.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 48M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; comment_1: COLLECT/REC DATA comment_2: IN 'AN' FORMAT. ! linenum: 16.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 20M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: DISABLE SUN ANG.TEST, comment_2: DUMP ETR, SLEW +V2 WING TO comment_3: 0DEG VIA PSTOL SASLEW(0,0). comment_4: GET +V2/0 CONFIG NO LATER comment_5: THAN 10M PRIOR TO NITE/DAY comment_6: X'ING. START 10M AFTER NOON ! linenum: 17.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 20M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: AFTER 16 BY 13M+/-5M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: BACKUP COMMAND FOR +V2 SLEW comment_2: TO 0 DEGS VIA PSTOL. GET comment_3: +V2/0 CONFIG NO LATER THAN comment_4: 10M PRIOR TO NITE/DAY X'ING comment_5: .IFF 16 FAILS, DO 17 @10MIN comment_6: BEFORE ENTER'NG ORBIT NITE ! linenum: 18.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 25M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=PN req_1: CRIT OBS; comment_1: COLLECT/REC DATA comment_2: IN 'PN' FORMAT, comment_3: FROM 18 TO 20 ! linenum: 19.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO param_2: FORMAT=PN req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: CONTACT REQ'D FOR comment_2: CONTINGENCY. ! linenum: 20.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 192M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=PN req_1: CRIT OBS; ! linenum: 21.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 192M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; comment_1: SLEW BOTH WINGS TO comment_2: 90DEGS AND ENABLE comment_3: SUN ANG.TEST VIA comment_4: STORED COMMANDS. GET comment_5: DATA IN 'AN' FORMAT ! linenum: 22.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: DUMP ETR @1024KBPS ! linenum: 23.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 25M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=PN req_1: CRIT OBS comment_1: COLLECT/RECORD DATA comment_2: IN 'PN' FORMAT, 1ST COMMAND TO SLEW comment_3: WINGS TO +84DEGS VIA STORED comment_4: COMMANDS, 10-12 MINS BEFORE NIGHT/ comment_5: DAY CROSSING ! linenum: 25.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 75M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; comment_1: COLLECT/RECORD comment_2: DATA IN 'AN' FORMAT ! linenum: 26.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: DISABLE SA/SUN ANG TEST. comment_2: SLEW WINGS TO 0 DEGS VIA comment_3: PSTOL SASLEW PN(0.0,0.0) comment_4: SET +/- V2 CONFIG. 10M comment_5: PRIOR TO DAY/NITE X'ING. comment_6: START @10+/-5M AFTER NOON. ! linenum: 27.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: BACKUP TRY TO DISABLE SA/ comment_2: SUN ANG TEST & SLEW WINGS comment_3: TO 0 DEGS. SET +/-V2 CON- comment_4: FIG.10M PRE-DAY/NITE X' comment_5: ING. IFF 26 FAILS, START comment_6: 27 AT 10+/-5M BEFORE NOON ! linenum: 28.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 96M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=PN req_1: CRIT OBS; comment_1: COLLECT comment_2: DATA IN 'PN' FORMAT ! linenum: 29.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 15M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: RT ANALYSIS; req_2: REQ UPLINK; comment_1: CONTACT REQ'D FOR comment_2: CONTINGENCY ! linenum: 30.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 192M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, param_2: FORMAT=AN req_1: CRIT OBS; comment_1: SLEW WINGS TO 90 DEGS comment_2: VIA STORED COMMANDS. comment_3: SWITCH TO 'AN' FORMAT comment_4: FOR 192 MINS. ! linenum: 31.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 20M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: AFTER 30 BY 20M +/- 10M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: COMMAND TO PATCH ON- comment_2: NRLIM TO 90DEGS, comment_3: AND comment_4: BATTERY ROC SM TEST, & comment_5: REINSTATE NORMAL PCS comment_6: ACQ GAINS. ! linenum: 31.500 targname: SEP config: S/C opmode: POINTING aperture: V1 num_exp: 1 time_per_exp: 1S fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO, req_1: AFTER 30 BY 20M+/-10M; comment_1: ENABLE SA/SUN ANGLE comment_2: TEST VIA STORED comment_3: COMMANDS. ! linenum: 32.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 20M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: AFTER 31 BY 25M+/-10M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: COMMAND TO DUMP ETR comment_2: AT 1024KBPS ! linenum: 33.000 targname: SEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 10M fluxnum_1: 1 priority: 1 param_1: CONTROL=GYRO req_1: AFTER 32 BY 150M+/-20M; req_2: RT ANALYSIS; req_3: REQ UPLINK; comment_1: COMMAND TO PATCH comment_2: SFFCHG TO 408 AMP-HRS ! ! end of exposure logsheet ! No scan data records found