PDS_VERSION = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 1998-04-08 NOTE = "MGS RST Instrument Health Report HEA8098A.TXT" END_OBJECT = TEXT END Miscellaneous ============= SOPC operations returned to normal yesterday after about 24 hrs of down time (see HEA8097A.TXT). Overnight we caught up on two days' backlog in spacecraft engineering, DSN monitor, and open loop data. Using the File Interchange System (FIS) we were able to transfer about 43 MB of AMD, OPT, SAK, SPK, and TCK files to Stanford this morning. FIS is the alternative to the CDB; after the upgrade from SunOS to Solaris later this year, it will be the ONLY way we can obtain such files. Our interaction with FIS still needs to be streamlined (there are two intermediate stops between the file server at JPL and our SOPC at Stanford); but the transfer itself took only 21 minutes, compared with an expected transfer time of over 2 hrs using our normal NASCOM line. The occ.log comments field has been modified slightly. References to "data/POCA sync problems" have been replaced by "sawtooth." Notes about amplitude variations in the baseline have been replaced by "baseline +/-0.n dB". Both should improve ability to search the file for recurring problems. Frank Lemoine has created an SPK file from Goddard reconstructions of the spacecraft trajectory; the file covers most of four days at the end of March. Joe Twicken has processed data from Occultation #101 and reports the open loop Doppler residuals look very good. More tests are in progress. Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 1998-04-06T00:00:00.133 Last SCET: 1998-04-06T23:29:04.625 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 1242 F-0195 HGA_EL_ANG 0 0 0.00E+00 0.00E+00 0.00E+00/0.00E+00 1242 L-0034 MOT1_RANGING 0 0 15685 L-0036 MOT1_TLM_MOD 0 0 15685 L-0037 MOT1_USO_ENA 0 1 15685 L-0044 MOT2_RANGING 0 1 15685 L-0046 MOT2_TLM_MOD 0 1 15685 L-0047 MOT2_USO_ENA 0 1 15685 L-0053 RF_SW_OSC 1 2 15685 L-0060 TWTA1_FILMNT 0 1 15685 L-0061 TWTA1_HV 0 1 15685 L-0070 TWTA2_FILMNT 1 1 15685 L-0071 TWTA2_HV 0 1 15685 L-0080 USO_PWR 0 0 15685 L-0090 KaBLE_STAT 1 1 15685 L-0091 KaBLE_ENABLE 0 0 15685 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/4.59E-07 8145 L-0121 MOT2_RCV_AGC 159 255 -1.53E+02 -1.26E+02 -1.37E+02/7.27E-02 8145 L-0131 TWTA1_HLX_I 0 36 -3.84E-02 6.76E-01 -7.37E-03/1.53E-03 8145 L-0132 TWTA1_ANOD_V 0 243 -1.00E+03 -5.19E+02 -1.00E+03/1.49E-01 7615 L-0141 TWTA2_HLX_I 17 44 2.86E-01 8.25E-01 7.39E-01/1.23E-03 8146 L-0142 TWTA2_ANOD_V 61 240 -8.66E+02 -5.08E+02 -8.57E+02/3.87E-01 7616 L-0200 USO_REG_V 202 205 4.04E+00 4.10E+00 4.08E+00/9.42E-05 7616 L-0201 USO_OVEN_V 123 126 2.46E+00 2.52E+00 2.50E+00/7.74E-05 7616 T-0302 EPC1_T 117 128 2.42E+01 2.90E+01 2.56E+01/2.47E-02 1957 T-0303 EPC2_T 103 124 2.59E+01 3.50E+01 3.17E+01/2.84E-02 1957 T-0310 RF_ISOLTR1_T 170 186 2.61E+01 3.17E+01 2.77E+01/1.20E-02 8147 T-0311 RF_ISOLTR2_T 168 192 2.38E+01 3.24E+01 2.94E+01/1.76E-02 8147 T-0312 TWT1_T 162 189 2.49E+01 3.45E+01 2.78E+01/2.55E-02 1957 T-0313 TWT2_T 161 197 2.17E+01 3.49E+01 3.18E+01/4.32E-02 1957 T-0315 USO_T 167 175 1.15E+01 1.39E+01 1.22E+01/1.08E-02 1957 T-0316 KA_AMP_T 146 164 3.38E+01 4.05E+01 3.71E+01/1.38E-02 3845 Engineering Data Statistical Summary from CSV2STAT: First SCET: 1998-04-07T01:36:25.125 Last SCET: 1998-04-07T22:46:56.618 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 1052 F-0195 HGA_EL_ANG 0 0 0.00E+00 0.00E+00 0.00E+00/0.00E+00 1052 L-0034 MOT1_RANGING 0 0 12608 L-0036 MOT1_TLM_MOD 0 0 12606 L-0037 MOT1_USO_ENA 0 1 12608 L-0044 MOT2_RANGING 0 1 12608 L-0046 MOT2_TLM_MOD 0 1 12606 L-0047 MOT2_USO_ENA 0 1 12608 L-0053 RF_SW_OSC 1 2 12606 L-0060 TWTA1_FILMNT 0 1 12608 L-0061 TWTA1_HV 0 1 12607 L-0070 TWTA2_FILMNT 1 1 12607 L-0071 TWTA2_HV 0 1 12608 L-0080 USO_PWR 0 0 12608 L-0090 KaBLE_STAT 1 1 12608 L-0091 KaBLE_ENABLE 0 0 12607 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/9.23E-07 6607 L-0121 MOT2_RCV_AGC 167 255 -1.53E+02 -1.29E+02 -1.41E+02/9.30E-02 6607 L-0131 TWTA1_HLX_I 0 36 -3.84E-02 6.76E-01 -6.65E-05/1.89E-03 6607 L-0132 TWTA1_ANOD_V 0 243 -1.00E+03 -5.19E+02 -1.00E+03/1.87E-01 6077 L-0141 TWTA2_HLX_I 17 43 2.86E-01 8.05E-01 7.32E-01/1.49E-03 6607 L-0142 TWTA2_ANOD_V 61 239 -8.66E+02 -5.10E+02 -8.56E+02/4.81E-01 6077 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/1.06E-04 6077 L-0201 USO_OVEN_V 123 126 2.46E+00 2.52E+00 2.50E+00/8.51E-05 6077 T-0302 EPC1_T 117 129 2.37E+01 2.90E+01 2.60E+01/3.17E-02 1575 T-0303 EPC2_T 103 124 2.59E+01 3.50E+01 3.19E+01/3.75E-02 1575 T-0310 RF_ISOLTR1_T 170 186 2.61E+01 3.17E+01 2.79E+01/1.48E-02 6605 T-0311 RF_ISOLTR2_T 167 192 2.38E+01 3.28E+01 2.97E+01/2.16E-02 6605 T-0312 TWT1_T 162 188 2.53E+01 3.45E+01 2.80E+01/3.39E-02 1574 T-0313 TWT2_T 160 197 2.17E+01 3.52E+01 3.20E+01/5.47E-02 1574 T-0315 USO_T 167 175 1.15E+01 1.39E+01 1.23E+01/1.49E-02 1575 T-0316 KA_AMP_T 145 163 3.42E+01 4.09E+01 3.72E+01/2.13E-02 3076 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 -------- --- -------- -------- ---- ---- ---- ---- ---- ----- ---- ----- 1998/096 15 18:52:57 19:09:00 5000 2000 2 12 1666 4816 0 50.1 1998/096 15 19:36:00 20:14:00 5000 2000 2 12 1666 11401 0 15.7 1998/097 45 06:32:12 06:49:00 5000 2000 2 12 1666 5041 0 49.5 1998/097 54 07:15:00 07:43:00 5000 2000 2 12 1666 8401 0 9.0 1998/097 54 18:11:40 18:28:00 5000 2000 2 12 1666 4901 0 42.8 1998/098 34 05:53:10 06:08:00 5000 2000 2 12 1666 4451 0 46.7 1998/098 34 06:33:00 07:12:00 5000 2000 2 12 1666 11701 0 13.3 1998/098 65 18:13:00 18:45:00 5000 2000 2 12 1666 9601 0 8.7 Anomalies --------- Data starting at 98/093-10:09:00 (DSS 65) had so many POCA errors that our software could not fix them automatically. This was an egress occultation with carrier-to-noise ratio less than 10 dB. Joe Twicken has opted not to attempt manual repairs. Data starting at 98/093-21:00:15 (DSS 15) had synchronization errors between data samples and POCA readings (the "sawtooth" problem). Data starting at 98/096-18:52:57 (DSS 15) and 98/097-06:32:12 (DSS 45) had higher than usual amplitude variations in the baseline (+/-0.5 and +/-0.3 dB, respectively). Data starting at 98/097-18:11:40 (DSS 54) suffered from an apparent catastrophic POCA failure. Paula Eshe noted early POCA error messages, but that they ceased as soon as the DSP began recording. They resumed about six minutes later, at which point the carrier completely disappears from the passband in quick-look power spectra (Figure HEA8098A.PS1). The signal returns to the passband about two minutes later, but its frequency is erratic. The occultation may have been captured, but the quick-look data are equally consistent with another POCA change putting the signal out of the passband a second time. Trish Priest reported that a replacement POCA had been installed at SPC 60 before the observations starting at 1998/098-18:13:00 (Occ 123e; DSS 65). We found 8 POCA time tags out of order, however. Data from the corresponding ingress (start time 1998/098-17:35:00) seem to have been lost between DSS 65 and the NERT Cache. Data Control has not been able to locate them, so Trish Priest will request a retransmission during the next DSS 54 pass. Analysis -------- Dave Hinson has completed analysis of egress occultation data beginning at 1998/091-11:31:00 (Occ #108e; DSS 54). His report follows: This is the first exit data I have looked at. The retrieval software did finally run to completion, but only after manual "editing" of the data at several stages. The results have large uncertainties and are of very little value for atmospheric science or radius measurements. There are several general problems with the exit data: 1) Exit occurs near periapsis, and the orbit reconstructions do not remove all the frequency residuals in the post occultation baseline. The spacecraft may be close enough to Mars to produce a significant gravity signature in the data. 2) The spacecraft is within the ionosphere of Mars during a significant portion of the measurements. 3) The post occultation signal intensity varies significantly with time. This may be the result of spacecraft rotation and the LGA antenna pattern. 4) The SNR is quite low. This makes it difficult to identify the 6 dB reduction in signal strength expected as the ray path grazes the surface. Items 1, 2, and 4 affect the atmospheric measurements. Items 3 and 4 affect the radius measurements. I'm not optimistic that we will learn much of value about the atmosphere of Mars from the exit measurements. Radius measurements may not be accurate enough to be useful. On the other hand, the open loop data may be of value for studies of the gravity field. Closed Loop Data ================ Data Collection --------------- We have obtained the following files from OSCAR and EPIC: Original File Name Name on SOPC ------------------------------ ------------ ODF: 98096O097.DAT;1 8096097A.ODF 98096O097_10S.SJO;1 8096097B.ODF 98097O098.DAT;1 8097098A.ODF 98097O098_10S.SJO;1 8097098B.ODF IONCAL: IONCAL_94_9803_DOPR.CSP;5 8060091E.ION IONCAL_94_9804_DOPR.CSP;1 8091121A.ION TROPCAL: TROPCAL_94_9803_DOPR.CSP;1 8060091A.TRO TROPCAL_94_980401_0406_DOPR.CSP;1 8091096A.TRO WEATHER: WEATHER_10_LATEST.TXT;106 80010961.WEA WEATHER_40_LATEST.TXT;105 80010964.WEA WEATHER_60_LATEST.TXT;105 80010966.WEA EOP: 980407-eop.long 20208132.EOP 980407-eop.short 71318132.EOP Ancillary Data ============== Data Collection --------------- We have obtained the following files from the CDB: Original File Name Name on SOPC ------------------------------ ------------ SPK: spk_i_980407_OD226_254_V1 8097112A.SPK OPT: optg_i_980407_OD226_254_V1 8097112A.OPT SPK: spk_i_980405_OD222_250_V1 8095110A.SPK SPK: spk_i_981213-990104_AB2IntC 8347004A.SPK SPK: spk_i_990104-990119_AB2IntD 9004019A.SPK AMD: amdgen.98-096.out 8092092A.AMD OPT: optg_i_980405_OD222_250_V1 8095110A.OPT OPT: optg_i_981213-990104_AB2IntC 8347004A.OPT OPT: optg_i_990104-990119_AB2IntD 9004019A.OPT SPK: spk_i_990119-990125_AB2IntE 9019025A.SPK AMD: amdgen.98-096.out 8092092B.AMD OPT: optg_i_990119-990125_AB2IntE 9019025A.OPT OPT: optg_i_990125-990203_AB2IntF 9025034A.OPT SPK: spk_i_990119-990125_AB2IntE 9019025B.SPK SAK: mgs_solar_array_1998-096.ck 8096096A.SAK SAK: mgs_solar_array_1998-097.ck 8097097A.SAK TCK: mgs_spice_c_kernel_1998-096.ck 8096096A.TCK TCK: mgs_spice_c_kernel_1998-097.ck 8097097A.TCK SPK: spk_i_990125-990203_AB2IntF 9025034A.SPK Figure Captions =============== HEA8098A.PS1: Spectra beginning at 1998/097-18:11:40 (Occ #121i; DSS 54) showing loss of signal about 6 minutes into the observation, recovery of the signal about two minutes later, and erratic frequency behavior until loss of signal at occultation. Each curve is a one minute average power spectrum. 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.