PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2000-11-21 NOTE = "MGS RST Instrument Health Report HEA0326A.TXT" END_OBJECT = TEXT END Miscellaneous ============= We have had several problems acquiring ODS data in the past 12 hrs; details are given below under Open Loop Data. These may relate to more generally reported query server issues that have come up since the E1.0 upgrade. Dave Eckart reported a week ago (2000-11-14) on current MGS fuel and mass status as follows: Current hydrazine remaining: 31.199 kg Average usage (last 103 days): 28.4 g/day Spacecraft Mass: 711.01 Kg Dry Mass 674.52 kg Ox 5.289 kg Fuel 31.199 kg Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 2000-11-19T00:00:02.548 Last SCET: 2000-11-19T23:59:58.536 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 6424 12701 1.57E+00 3.10E+00 2.84E+00/1.07E-02 2493 F-0195 HGA_EL_ANG -11233 11089 -2.74E+00 2.71E+00 -4.97E-01/3.78E-02 2493 L-0034 MOT1_RANGING 0 0 4998 L-0036 MOT1_TLM_MOD 0 0 4993 L-0037 MOT1_USO_ENA 0 0 4998 L-0044 MOT2_RANGING 1 1 4998 L-0046 MOT2_TLM_MOD 0 1 4993 L-0047 MOT2_USO_ENA 1 1 4998 L-0053 RF_SW_OSC 2 2 4993 L-0060 TWTA1_FILMNT 0 0 4998 L-0061 TWTA1_HV 0 0 4996 L-0070 TWTA2_FILMNT 0 1 4996 L-0071 TWTA2_HV 0 1 4998 L-0080 USO_PWR 0 0 4998 L-0090 KaBLE_STAT 0 0 4998 L-0091 KaBLE_ENABLE 1 1 4996 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/7.42E-07 4998 L-0121 MOT2_RCV_AGC 161 255 -1.53E+02 -1.27E+02 -1.49E+02/1.26E-01 4998 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.83E-02/1.98E-05 4998 L-0132 TWTA1_ANOD_V 0 2 -1.00E+03 -1.00E+03 -1.00E+03/1.48E-02 624 L-0141 TWTA2_HLX_I 18 42 3.06E-01 7.85E-01 5.23E-01/2.84E-03 4998 L-0142 TWTA2_ANOD_V 61 229 -8.66E+02 -5.30E+02 -6.83E+02/6.56E+00 624 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.70E-04 625 L-0201 USO_OVEN_V 127 130 2.54E+00 2.60E+00 2.58E+00/3.32E-04 625 T-0302 EPC1_T 188 195 -3.74E+00 -7.38E-01 -2.62E+00/2.52E-02 624 T-0303 EPC2_T 181 192 -2.43E+00 2.11E+00 -6.14E-01/4.80E-02 624 T-0310 RF_ISOLTR1_T 229 233 -6.05E+00 -1.15E+00 -3.57E+00/8.85E-03 4993 T-0311 RF_ISOLTR2_T 225 231 -3.52E+00 3.13E+00 -7.29E-01/2.15E-02 4993 T-0312 TWT1_T 229 232 -4.77E+00 -1.15E+00 -2.72E+00/3.07E-02 623 T-0313 TWT2_T 219 233 -6.05E+00 8.56E+00 9.58E-01/1.69E-01 623 T-0315 USO_T 144 148 1.94E+01 2.06E+01 1.99E+01/8.23E-03 624 T-0316 KA_AMP_T 215 220 7.73E+00 1.16E+01 9.87E+00/2.58E-02 626 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 -------- --- -------- -------- ---- ---- ---- ---- ---- ----- ---- ----- 2000/325 15 11:10:00 11:18:00 5000 2000 2 12 1666 2401 0 46.6 2000/325 15 12:22:00 12:29:00 5000 2000 2 12 1666 2101 0 43.5 2000/325 15 14:20:00 14:27:00 5000 2000 2 12 1666 2101 0 47.7 2000/325 15 16:18:00 16:24:00 5000 2000 2 12 1666 1801 0 47.8 2000/325 15 18:15:00 18:22:00 5000 2000 2 12 1666 2101 0 47.7 2000/325 15 20:14:00 20:20:00 5000 2000 2 12 1666 1801 0 46.9 2000/325 45 20:14:00 20:20:00 5000 2000 2 12 1666 1801 0 48.3 2000/325 45 22:11:04 22:18:00 5000 2000 2 12 1666 2078 0 48.4 2000/326 45 00:08:00 00:15:00 5000 2000 2 12 1666 2098 0 48.3 2000/326 45 02:06:00 02:13:00 5000 2000 2 12 1666 2097 0 47.6 Anomalies --------- We were unable to connect to the Mgs_CDR_QueryServer last night (local time). Mgs_MASTER_QueryServer and Mgs_SCT_QueryServer did not have Radio Science ODS data either last night or this morning. Connection with 'CDR' was re-established this morning, but three of four occultations arrived with missing records. It appears records were lost from the beginning of each, but we have not carried out a detailed analysis. Data from the final occultation on the previous pass (DSS 15) were also lost, suggesting a problem in GDS rather than data acquisition. Details follow: Data were lost from the DSS 15 acquisition of occultation 7622i at about 2000/325-20:13:57. We threw out those results and started a new query beginning at 20:14:00. Those data appear to be error-free. The same occultation (7622i) was also captured at DSS 45. We delayed start of that query to 2000/325-20:14:00; those results appear to be error-free. The remaining three occultations at DSS 45 appear to have missing records at the beginning of data acquisition. Occultation 7623i (DSS 45, nominal start time 2000/325-22:11:00) is missing 22 records, and its actual start time was delayed 4+ seconds. Occultations 7624i and 7625i (DSS 45, start times 2000/326-00:08:00 and 02:06:00, respectively) are missing 3 and 4 records, respectively. The start time in each case would have been delayed less than a full second if records were missing at the beginning. If records had been lost at the end, the stop time would not be on an even minute; if missing in the middle, our processing would have reported missing records. The following occultations were captured at two ground stations: Occultation Setting Rising DSP Start Date/Time DSS DSS ----------- ------- ------ ------------------- 7618e 54 15 2000/325-11:10:00 7622i 15 45 2000/325-20:13:00 Occultation 7618i (DSS 15, start time 2000/325-12:22:00) has a +/-3 dB oscillation in carrier level immediately before ingress. The change takes place over about 75s and is enormous by normal standards. However, the carrier level at the beginning of the recording is more than 4 dB lower than on the preceding and following occultations and may indicate that the spacecraft HGA was off Earth point. Depending on frequency behavior, this occultation may be of limited use for science. Carrier level in occultation 7619i (DSS 15, start time 2000/325- 14:20:00) drifts about -0.8 dB during the 4 minutes prior to ingress. Closed Loop Data ================ Data Collection --------------- We have obtained the following files from OSCAR and EPIC: Original File Name Name on SOPC -------------------------------- ------------ ODF: 00322O325_10S.SJO;1 0322325A.ODF IONCAL: IONCAL_94_0011_DOPR.CSP;3 0306336C.ION TROPCAL: TROPCAL_94_001101_1119_DOPR.CSP;1 0306325A.TRO Analysis -------- Frank Lemoine has provided additional details (slightly edited) regarding his study of one-way tracking data: I've gone back and looked at which arcs could 'benefit' from the addition of one-way data. It appears substantial quantities of one-way data start appearing about the week of 2000-03-24 and virtually every arc since then has substantial quantities of apparently useful one-way data. Prior to that (at least going back to the start of the year 2000) it appears one-way data were available only sporadically (for instance on 2000-01-06 as Dave Hinson pointed out and then not again until the end of February 2000). The good news is that I can probably issue updated orbits for the period 2000-03-24 to 2000-06-19 - except for two arcs in May 2000 that are still causing problems. Cleaning up the data is not an easy job and I still have to wonder (and hope) that there is not a DSN sub-processor somewhere manufacturing data. The quantity of one-way data really begs the questions (1) Where are the data coming from? (2) Which antenna (or transponder) are they using? (3) Are the data real? (4) Who initiated the one-way tracking? Whether the one-way data use the USO or the DSN transponder, (if they are real) they seem to be of comparable quality to the two-way data - once they have been cleaned up. By the way, I shouldn't need to point out that what allows one to filter the one-way data and distinguish the wheat from the chaff - is that we have typically one two-way tracking pass/day. In all the arcs I've looked at, I've only "added" one-way data when there were large gaps - more than five hours - in the two-way tracking. Ancillary Data ============== Data Collection --------------- We have obtained the following files from the FIS: Original File Name Name on SOPC -------------------------------- ------------ AMD: amdgen.00-325.out 0323323A.AMD OPT: optg_m_001120_OD7619-7621_7869_V1 0325346A.OPT SOE: mm090b.05.tsoe 0328331C.SOE SOE: mm092a.01.tsoe 0334338A.SOE SPK: spk_m_001120_OD7619-7621_7869_V1 0325346A.SPK