PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2001-06-07 NOTE = "MGS RST Instrument Health Report HEA1158A.TXT" END_OBJECT = TEXT END Miscellaneous ============= Frank Lemoine has relayed more information from Stuart Demcak regarding ISA Z71620 (see HEA1145A.TXT). Stuart's (slightly edited) report says: I have talked to Dave Eckart, and he thinks he has found the reason that we see the features in the Doppler residuals documented in ISA Z71620. It has to do with the solar panel movements. Dave says that he checked the times of the events I gave in the ISA, and they correspond to the end of the solar array re-orientation movement. I had mentioned in the ISA that, looking quickly back at our solutions, the first time I noticed this was on April 17. Dave said that the spacecraft solar panels started the +/- 25 degree offset strategy on April 16. The solar panel moves to three different positions for each orbit during this time. I thought that this movement would be accomplished fairly quickly, but Dave said that it generally takes around 4-5 minutes -- the solar arrays move at about 0.24 degrees/second. I looked at the beginning of the sequence mm139 (5/13, DOY 133) and calculated the times it would take the solar panels to move to new positions. The solar array movement times I calculated over one orbit were 4.9, 9.4 and 4.4 minutes. This also agrees with the observations I mentioned in the ISA. Another thing to note is that we seem to sometimes see similar features in the F2 data arc after periapsis (before beta rewind) as described in the ISA. Since this data is significantly noisier, it is harder to see this. These F2 residuals "jump" events seem to occur at the start of the solar array movement for an orientation change. In general, it appears that we see the start of one solar array (S/A) orientation change somewhat before the beta rewind (after periapsis), and the end of the next solar array movement shortly after finishing beta rewind and getting 2-way Doppler data (F2). The end and start of the previous S/A orientation changes are usually in the Doppler data gap during the HGA beta rewind. The third S/A re-orientation is during occultation, so it is never seen. Every once in a while two near-by jumps in the F2 residuals (separated by a few minutes) are seen coming out of beta rewind. I examined one of these cases, and the first jump corresponds to the start of the S/A re-orientation movement. Assuming a .24 degree/second S/A rate of movement, the end of the S/A re-orientation occurs right when the second F2 residuals jump is seen. This is very good confirmation of what Dave Eckart says. Just a few other comments. 1) At the start and end of the S/A movement, we see obvious spikes in the F2 (and F1) residuals. They only last for 10's of seconds. 2) Before the +/- 25 degree S/A offsets, the F2 residuals before and after these spikes would be near zero. 3) Since the start of the +/- 25 degree S/A offsets, there often is a bias between the F2 residuals before and after these spikes. These biases are often significant, yet are sometimes negligible or even non-existent. In other words, they are not always consistent. These biases seem to be equivalent to a maneuver of up to ~0.7 mm/s. 4) Will these biases described in the previous comment become even larger when the solar arrays are switched to +/- 35 degree offsets? This is something that should be examined when the switch to the +/- 35 degree offset occurs. Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 2001-06-05T00:00:00.158 Last SCET: 2001-06-05T23:59:56.146 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 6424 10567 1.57E+00 2.58E+00 2.42E+00/5.84E-03 2681 F-0195 HGA_EL_ANG -11233 11089 -2.74E+00 2.71E+00 -6.82E-01/3.12E-02 2681 L-0034 MOT1_RANGING 0 0 5363 L-0036 MOT1_TLM_MOD 0 0 5362 L-0037 MOT1_USO_ENA 0 0 5363 L-0044 MOT2_RANGING 1 1 5363 L-0046 MOT2_TLM_MOD 0 1 5362 L-0047 MOT2_USO_ENA 1 1 5363 L-0053 RF_SW_OSC 2 2 5362 L-0060 TWTA1_FILMNT 0 0 5363 L-0061 TWTA1_HV 0 0 5365 L-0070 TWTA2_FILMNT 0 1 5365 L-0071 TWTA2_HV 0 1 5363 L-0080 USO_PWR 0 0 5363 L-0090 KaBLE_STAT 0 0 5363 L-0091 KaBLE_ENABLE 1 1 5365 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/8.14E-07 5363 L-0121 MOT2_RCV_AGC 125 255 -1.53E+02 -1.13E+02 -1.44E+02/2.20E-01 5363 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.83E-02/1.77E-05 5363 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.37E-02 672 L-0141 TWTA2_HLX_I 17 42 2.86E-01 7.85E-01 4.83E-01/2.65E-03 5363 L-0142 TWTA2_ANOD_V 61 229 -8.66E+02 -5.30E+02 -6.48E+02/6.05E+00 672 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.50E-04 672 L-0201 USO_OVEN_V 129 132 2.58E+00 2.64E+00 2.61E+00/3.93E-04 672 T-0302 EPC1_T 187 196 -4.19E+00 -3.25E-01 -2.47E+00/3.97E-02 671 T-0303 EPC2_T 181 192 -2.43E+00 2.11E+00 -6.79E-01/4.50E-02 671 T-0310 RF_ISOLTR1_T 229 233 -6.05E+00 -1.15E+00 -3.27E+00/8.59E-03 5362 T-0311 RF_ISOLTR2_T 224 233 -6.05E+00 4.11E+00 -9.47E-01/2.89E-02 5362 T-0312 TWT1_T 228 232 -4.77E+00 -2.48E-02 -2.07E+00/3.99E-02 669 T-0313 TWT2_T 218 233 -6.05E+00 9.37E+00 3.78E-01/1.79E-01 669 T-0315 USO_T 134 137 2.26E+01 2.35E+01 2.32E+01/7.92E-03 671 T-0316 KA_AMP_T 215 220 7.73E+00 1.16E+01 9.94E+00/2.49E-02 669 L-0200, L-0201, and T-0315 are nominal. Open Loop Data ============== Data Collection --------------- We have transferred the following open loop data to Stanford: YYYY/DDD DSS DSP SAMP BW DSP BIT REC RECS RECS MAX START STOP RATE MODE RESN LEN MSSG SNR -------- --- -------- -------- ---- ---- ---- ---- ---- ----- ---- ----- 2001/157 45 12:43:00 12:51:00 5000 2000 2 12 1666 2401 0 60.8 2001/157 45 14:41:00 14:49:00 5000 2000 2 12 1666 2401 0 60.3 2001/157 45 16:39:00 16:46:00 5000 2000 2 12 1666 2101 0 61.1 2001/157 45 18:37:00 18:44:00 5000 2000 2 12 1666 2101 0 60.6 2001/157 45 20:34:00 20:42:00 5000 2000 2 12 1666 2401 0 58.7 2001/157 65 22:32:00 22:40:00 5000 2000 2 12 1666 2401 0 59.8 2001/158 65 00:30:00 00:38:00 5000 2000 2 12 1666 2400 0 60.4 2001/158 65 02:28:00 02:35:00 5000 2000 2 12 1666 2101 0 60.1 2001/158 15 08:21:00 08:29:00 5000 2000 2 12 1666 2401 0 60.2 2001/158 15 10:19:00 10:26:00 5000 2000 2 12 1666 2101 0 60.8 2001/158 45 12:17:00 12:24:00 5000 2000 2 12 1666 2101 0 58.8 2001/158 45 14:14:00 14:22:00 5000 2000 2 12 1666 2401 0 59.7 2001/158 45 16:12:00 16:20:00 5000 2000 2 12 1666 2401 0 60.9 2001/158 45 18:10:00 18:18:00 5000 2000 2 12 1666 2401 0 60.4 Anomalies --------- Data from occultation 10046i (DSS 65, start time 2001/158-00:30:00) have the first record missing. Closed Loop Data ================ Data Collection --------------- We have obtained the following files from OSCAR: Original File Name Name on SOPC -------------------------------- ------------ ODF: 01156O157_10S.SJO;1 1156157A.ODF Ancillary Data ============== Data Collection --------------- We have obtained the following files from the FIS: Original File Name Name on SOPC ------------------------------------ ------------ AMD: amdgen.01-158.out 1156157A.AMD OPT: optg_m_010607_OD10053-10055_10303_V1 1158179A.OPT SAK: mgs_solar_array_2001-156.ck 1156156A.SAK SPK: spk_m_010607_OD10053-10055_10303_V1 1158179A.SPK TCK: mgs_spice_c_kernel_2001-156.ck 1156156A.TCK SOE: mm148a.00.tsoe 1165168A.SOE We have obtained the following files from NAIF: Original File Name Name on SOPC ------------------------------------ ------------ AGK: mgs_hga_ck_2001-05-28.bc 1148148A.AGK