PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 1999-03-18 NOTE = "MGS RST Instrument Health Report HEA9077A.TXT" END_OBJECT = TEXT END Errata ====== Trish Priest was quoted in yesterday's report explaining absence of "ripples" in DSS 34 data: "... we don't do ranging at that station." In fact, she has discovered, the reason may be that the uplink transmitter has 7 dB less output power. In which case, we might be able to detect ripples by digging into the spectra a little more. Or, we can wait until opposition when reduction of the Earth-Mars distance will gain us another 3 dB in SNR. Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 1999-03-16T00:04:45.116 Last SCET: 1999-03-16T17:38:29.109 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 0 0 0.00E+00 0.00E+00 0.00E+00/0.00E+00 1930 F-0195 HGA_EL_ANG 0 0 0.00E+00 0.00E+00 0.00E+00/0.00E+00 1930 L-0034 MOT1_RANGING 0 1 3867 L-0036 MOT1_TLM_MOD 0 1 3866 L-0037 MOT1_USO_ENA 0 0 3867 L-0044 MOT2_RANGING 0 1 3867 L-0046 MOT2_TLM_MOD 0 1 3866 L-0047 MOT2_USO_ENA 0 1 3867 L-0053 RF_SW_OSC 2 2 3866 L-0060 TWTA1_FILMNT 0 0 3867 L-0061 TWTA1_HV 0 0 3863 L-0070 TWTA2_FILMNT 1 1 3863 L-0071 TWTA2_HV 0 1 3867 L-0080 USO_PWR 0 0 3867 L-0090 KaBLE_STAT 1 1 3867 L-0091 KaBLE_ENABLE 0 0 3863 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/0.00E+00 3867 L-0121 MOT2_RCV_AGC 159 255 -1.53E+02 -1.26E+02 -1.52E+02/6.99E-02 3867 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.82E-02/2.75E-05 3867 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.89E-02 485 L-0141 TWTA2_HLX_I 17 42 2.86E-01 7.85E-01 3.72E-01/1.71E-03 3867 L-0142 TWTA2_ANOD_V 60 234 -8.68E+02 -5.20E+02 -5.55E+02/3.91E+00 485 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.90E-04 483 L-0201 USO_OVEN_V 127 130 2.54E+00 2.60E+00 2.57E+00/4.47E-04 483 T-0302 EPC1_T 157 211 -1.20E+01 1.17E+01 -5.77E+00/2.96E-01 484 T-0303 EPC2_T 142 196 -4.19E+00 1.81E+01 1.19E+00/2.74E-01 484 T-0310 RF_ISOLTR1_T 207 234 -7.39E+00 1.67E+01 3.10E-01/1.12E-01 3866 T-0311 RF_ISOLTR2_T 203 238 -1.32E+01 1.88E+01 -3.99E+00/1.29E-01 3866 T-0312 TWT1_T 205 233 -6.05E+00 1.78E+01 1.61E+00/2.88E-01 484 T-0313 TWT2_T 195 238 -1.32E+01 2.25E+01 -4.04E+00/3.75E-01 484 T-0315 USO_T 144 152 1.83E+01 2.06E+01 2.01E+01/1.65E-02 484 T-0316 KA_AMP_T 180 211 1.43E+01 2.82E+01 1.81E+01/1.73E-01 483 Large swings in temperature between nadir pointing and playback continue. Within that context L-0200, L-0201, and T-0315 remain 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 -------- --- -------- -------- ---- ---- ---- ---- ---- ----- ---- ----- 1999/076 45 18:36:00 18:43:00 5000 2000 2 12 1666 2101 0 58.2 1999/076 45 19:50:00 19:57:00 5000 2000 2 12 1666 2101 0 57.1 1999/076 45 20:33:00 20:41:00 5000 2000 2 12 1666 2401 0 57.5 1999/076 34 22:31:00 22:38:00 5000 2000 2 12 1666 2101 0 55.5 1999/076 65 23:46:00 23:52:00 5000 2000 2 12 1666 1801 0 55.1 Anomalies --------- The occultation at 1999/076-21:48:00 was lost when the DSP had problems and was rebooted. Spectral ripples appear after the egress occultations at 18:36 and 20:41. These are "expected" based on recent experience. Spectral ripples also appear in the data beginning at 23:46. These are different on several grounds. (1) The occultation is an ingress; we have not seen ripples on an ingress before. (2) There are two sets of ripples; one is at about 23:47:00 and the second is 23:49:53, with the occultation itself at about 23:50:15. (3) The most prominent spurs (about -35 dBc) are a pair that drift at about +/-470 Hz/sec and pass through the carrier at about 23:49:57. In other cases, the spurs have always merged with the carrier and disappeared. 4) There are weaker spurs drifting at +/-930 Hz/sec and +/-1380 Hz/sec; these are about 2 and 3 times the rate of the strongest spur. There appears to be at least one higher mode. In other cases we have never seen more than a single pair of spurs. A plot of power spectra showing the spurs at 23:49:53 is included with this report as Figure HEA9077A.PS1. There are surface echoes in at least 4 of the 5 occultation recordings. In the last recording, the second set of spurs overruns the surface echo. Closed Loop Data ================ Data Collection --------------- We have obtained the following files from OSCAR and EPIC: Original File Name Name on SOPC -------------------------------- ------------ ODF: 99076E077_D23.DAT;1 9076076A.ODF 99076O077_10S.SJO;1 9076077A.ODF Ancillary Data ============== Data Collection --------------- We have obtained the following files from the FIS: Original File Name Name on SOPC -------------------------------- ------------ SAK: mgs_solar_array_1999-075.ck 9075075A.SAK TCK: mgs_spice_c_kernel_1999-075.ck 9075075A.TCK SOE: mf003b.03.tsoe 9082087C.SOE MOLA POD Team Orbit Solutions ============================= Data Collection --------------- We have obtained the following files from GEODESY: Original File Name Name on SOPC -------------------------------- ------------ gdn_ql10_902280000_903042130.tsp 9059063A.GDN gdn_ql10_903061200_903112245.tsp 9065070A.GDN gdn_ql10_903031900_903080000.tsp 9062066A.GDN Figure Caption ============== HEA9077A.PS1: Anomalous signals in spectra centered on 23:49:57, only 18 seconds before occultation ingress. The pair of strongest spurs drifts at about 460 Hz/sec and has amplitude approximately 35 dB below the carrier. Weaker pairs of spurs drift at higher rates, approximately 2 and 3 times faster than the first. There may be other spurs at 4 and possibly 5 times the base rate. The obliquely reflected surface echo is barely visible in the bottom plot near 2000 Hz. In the top plot it has drifted to about 1700 Hz, at a rate of -37 Hz/sec, which is typical for this observing geometry. Data are from DSS 65 on 1999/076; the DSP began recording at 23:46:00. Bottom plot is 23:49:53; top plot is 23:50:01. Curves are 512-point power spectra, each representing 0.2 sec of data (no averaging). Carrier frequency was at 1284 in the 2500 Hz bandwidth; carrier signal to noise was 59.4 dB/Hz. Figures ======= Plot(s) illustrate some of the points made in the text. Each plot is a PostScript file, created and printable on our SOPC. For report text file HEAydddC.TXT Figure N will be labeled HEAydddC.PSN and sent as the N+1st e-mail message of a set. We assume that you can strip off the e-mail headers and either display or print copies of the figures on a machine in your area. People who have indicated that they cannot handle these files by e-mail are not included in the e-mail distribution of figures.