PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 1999-04-08 NOTE = "MGS RST Instrument Health Report HEA9098A.TXT" END_OBJECT = TEXT END Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 1999-04-06T00:00:00.919 Last SCET: 1999-04-06T23:59:56.902 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 1449 5722 3.54E-01 1.40E+00 6.60E-01/1.09E-02 1864 F-0195 HGA_EL_ANG -10947 10946 -2.67E+00 2.67E+00 -6.44E-01/3.80E-02 1864 L-0034 MOT1_RANGING 0 1 3730 L-0036 MOT1_TLM_MOD 0 1 3731 L-0037 MOT1_USO_ENA 0 0 3730 L-0044 MOT2_RANGING 0 1 3730 L-0046 MOT2_TLM_MOD 0 1 3731 L-0047 MOT2_USO_ENA 0 1 3730 L-0053 RF_SW_OSC 2 2 3731 L-0060 TWTA1_FILMNT 0 0 3730 L-0061 TWTA1_HV 0 0 3731 L-0070 TWTA2_FILMNT 1 1 3731 L-0071 TWTA2_HV 0 1 3730 L-0080 USO_PWR 0 0 3730 L-0090 KaBLE_STAT 1 1 3730 L-0091 KaBLE_ENABLE 0 0 3731 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/0.00E+00 3730 L-0121 MOT2_RCV_AGC 129 255 -1.53E+02 -1.14E+02 -1.41E+02/2.68E-01 3730 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.83E-02/1.06E-05 3730 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.20E-02 468 L-0141 TWTA2_HLX_I 18 42 3.06E-01 7.85E-01 5.45E-01/3.37E-03 3730 L-0142 TWTA2_ANOD_V 61 236 -8.66E+02 -5.16E+02 -6.94E+02/7.73E+00 468 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.77E-04 467 L-0201 USO_OVEN_V 128 130 2.56E+00 2.60E+00 2.59E+00/4.32E-04 467 T-0302 EPC1_T 158 211 -1.20E+01 1.13E+01 2.13E+00/3.65E-01 466 T-0303 EPC2_T 145 198 -5.11E+00 1.68E+01 7.72E+00/3.38E-01 466 T-0310 RF_ISOLTR1_T 210 235 -8.77E+00 1.50E+01 6.54E+00/1.30E-01 3731 T-0311 RF_ISOLTR2_T 204 238 -1.32E+01 1.83E+01 6.52E+00/1.64E-01 3731 T-0312 TWT1_T 207 231 -3.52E+00 1.67E+01 8.58E+00/3.24E-01 466 T-0313 TWT2_T 196 238 -1.32E+01 2.21E+01 8.75E+00/5.08E-01 466 T-0315 USO_T 139 143 2.09E+01 2.20E+01 2.13E+01/1.04E-02 466 T-0316 KA_AMP_T 182 211 1.43E+01 2.75E+01 2.20E+01/1.96E-01 466 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 -------- --- -------- -------- ---- ---- ---- ---- ---- ----- ---- ----- 1999/097 65 02:12:00 02:19:00 5000 2000 2 12 1666 2101 0 9.7 1999/097 65 02:55:00 03:04:00 5000 2000 2 12 1666 2701 0 9.6 1999/097 65 04:10:00 04:17:00 5000 2000 2 12 1666 2101 0 9.3 1999/097 15 04:53:00 05:01:00 5000 2000 2 12 1666 2401 0 57.1 1999/097 15 06:51:00 06:59:00 5000 2000 2 12 1666 2401 0 58.4 1999/097 15 08:05:00 08:12:00 5000 2000 2 12 1666 2101 0 59.9 1999/097 15 08:49:00 08:57:00 5000 2000 2 12 1666 2401 0 59.2 1999/097 15 10:03:00 10:10:00 5000 2000 2 12 1666 2101 0 60.2 1999/097 15 10:46:00 10:55:00 5000 2000 2 12 1666 2701 0 59.6 1999/097 15 12:01:00 12:08:00 5000 2000 2 12 1666 2101 0 59.4 1999/097 15 12:44:00 12:52:00 5000 2000 2 12 1666 2401 0 58.8 Anomalies --------- The occultation starting 1999/097-00:58:00 was lost when the open loop receiver tuning predicts could not be loaded. Occultation data starting at 1999/097-06:08:00 is "not found" in the Mgs_CDR_QueryServer; cause is unknown. The three DSS 65 occultations above appear to have been collected with no input to the A/D converters. There is neither signal nor noise; the range of sample values is, at most, a couple of bits. All DSS 15 ingress occultations (5) have spectral ripples. The first two DSS 15 occultations have possible clipping of the diffraction overshoot; the last six have probable clipping. Yesterday we recommended at least a 1 dB increase in attenuator settings; based on these results we recommend at least 2 dB at DSS 15. There are surface echoes visible in a majority of DSS 15 occultations. Analysis -------- We have analyzed the spectral ripples found in data from 1999/095 and 1999/096. Dick Simpson looked at timing of the ripples; Dave Hinson checked their impact on extraction of the temperature-pressure profile. A slightly edited version of Dick's report: There were 9 spectral ripples on days 095-096. All were on egress, all were at DSS 45. All were of what I will call "Type 1" -- a pair of spurs moving toward the carrier at approximately linear rates from either side, merging with the carrier, and disappearing. Total duration of the event was about 5 sec, making the drift rates about +/-250 Hz/sec. For possible future use, I will define "Type 2" ripples to be spurs that move on parabolic paths in the frequency domain, merge with the carrier, and disappear. "Type X" ripples cross the carrier and continue on, usually with many harmonics which cross the carrier at the same time. By carefully measuring the time of egress (time at which carrier power had risen to 25% of free space value; accurate to perhaps 0.05 sec from high-resolution PREPPOWER plots) and the time at which the spurs merged with the carrier (accurate to perhaps 0.3 sec from high- resolution PREPLOOK plots), I discovered that the merge time is always 159-163 sec after egress. This is in contrast to my earlier estimate, based on 60 sec average PREPLOOK plots, that times were in the range 1-4 minutes. Difference between successive spur-carrier merging times ranges from 7055 to 7065 sec, a wider spread than the times between egress and merge time. I'm not sure what to make of this highly repeatable delay. But it's clearly not the result of an operator pushing a button after each egress. The question now is whether 159 sec is adequate for capturing the full science value of the occultation (and whether this value is stable over many occultations). Dave needs to answer the main question; perhaps Trish can provide insight on the parenthetical part. Dave's report (which refers to the second 095 event examined by Dick): I've retrieved a profile for occultation 339e (egress on April 5, 1999 at dss 45). Those data contained a "type 1" ripple, which merged with the carrier signal about 160 sec after the signal cleared the surface, when the ray path altitude was about 180 km. The ripple had no discernible effect on these measurements. The orbit reconstruction looks fairly good. We did not correct for HGA motion for this initial profile, but we will try it shortly. Finally, the time span of these data is what we had requested: surface to 200 km altitude plus a high-altitude baseline. Closed Loop Data ================ Data Collection --------------- No new data. Ancillary Data ============== Data Collection --------------- We have obtained the following files from the FIS: Original File Name Name on SOPC -------------------------------- ------------ AMD: amdgen.99-097.out 9095096A.AMD OPT: optg_m_990317_OD107-120_281_V2 9076091M.OPT SAK: mgs_solar_array_1999-096.ck 9096096A.SAK TCK: mgs_spice_c_kernel_1999-096.ck 9096096A.TCK MOLA POD Team Orbit Solutions ============================= Data Collection --------------- We have obtained the following files from GEODESY: Original File Name Name on SOPC -------------------------------- ------------ GDN: gdn_ql10_903181800_903240000.tsp 9077082A.GDN gdn_ql10_903221800_903280000.tsp 9081086A.GDN