PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM DATA_SET_ID = "MEX-M-MRS-1/2/3-MCO-0022-V1.0" STANDARD_DATA_PRODUCT_ID = ENB PRODUCER_ID = "SUE" PRODUCT_ID = "M00SUE0L1A_ENB_040982028_00.TXT" PRODUCT_CREATION_TIME = 2005-07-26T15:57:15.000 INSTRUMENT_HOST_ID = "MEX" OBJECT = TEXT PUBLICATION_DATE = 2005-06-10 NOTE = "MEX SUE Experimenter Notes" END_OBJECT = TEXT END From gene.goltz@jpl.nasa.gov Wed Apr 7 14:19:21 2004 Return-Path: Received: from smtp.jpl.nasa.gov (eis-msg-012.jpl.nasa.gov [137.78.160.40]) by magellan.Stanford.EDU (8.11.7p1+Sun/8.11.7) with ESMTP id i37LJKL25553 for ; Wed, 7 Apr 2004 14:19:20 -0700 (PDT) Received: from GGOLTZ-2K.jpl.nasa.gov (ggoltz-2k.jpl.nasa.gov [137.78.78.47]) by smtp.jpl.nasa.gov (8.12.10/8.12.10) with ESMTP id i37LJKMG004658; Wed, 7 Apr 2004 14:19:20 -0700 (PDT) Message-Id: <5.1.0.14.2.20040407140522.017a0c10@pop.jpl.nasa.gov> X-Sender: ggoltz@pop.jpl.nasa.gov X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Wed, 07 Apr 2004 14:19:20 -0700 To: Dick Simpson 650-723-3525 From: Gene Goltz Subject: MEX DOY 098 Occultation Data Cc: sami Asmar Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Content-Length: 534 Status: RO Dick, The MEX Occultation on DOY 098 (pass 0311) was performed over DSS-54 (it was scheduled to have been over DSS-55). After that bit got sorted out, I was able to get the Madrid RSR up, and I recorded and played back data as follows: - X-band only, 2-way - RSR1B2 - 8 kHz (I'll switch to 2 kHz in the future) - start = 20:27:20 - ingress = 20:34:35 (approximately) - stop = 20:40:00 - SFDUs = 1,522 You should be able to query these data from the TDS at your leisure. Regards, Gene From rsimpson Fri Apr 9 19:47:39 2004 Return-Path: Received: (from rsimpson@localhost) by magellan.Stanford.EDU (8.11.7p1+Sun/8.11.7) id i3A2laY05714; Fri, 9 Apr 2004 19:47:36 -0700 (PDT) Date: Fri, 9 Apr 2004 19:47:36 -0700 (PDT) From: Dick Simpson 650-723-3525 Message-Id: <200404100247.i3A2laY05714@magellan.Stanford.EDU> To: gene.goltz@jpl.nasa.gov, hinson@rocc.Stanford.EDU, joe@neptune.Stanford.EDU, len.tyler@stanford.Stanford.EDU, paetzold@geo.uni-koeln.de, rsimpson, sami.asmar@jpl.nasa.gov Subject: DSN MEX OCI days 098-100 Content-Length: 4753 Status: R Gene, Sami, Martin, et al: Summary comments from the MEX occultations captured at Madrid on days 098-100. In each case, I queried for only 10-15 minutes based on when Gene Goltz said the occultation happened. About two-thirds of the samples are before occultation, and one-third after. If anyone wants more, we can get it; but we should decide that soon. The RSR/DSN issues noted in the summary report on the 093/095 observations seem to have been resolved. These data look good: the signal is centered, the analog-to-digital converters are not saturated, and spurious signals seem to be at a minimum. If we compare the SOE, DKF, and actual signal behavior over the three days, there are few solid correlations. I have heard from Dwight Holmes that the DSN is complaining because the instructions they receive in SOE/DKF files are being overridden by late-arriving briefing messages and voice commands during the track. This suggests that the SOE and DKF may not be useful in reconstructing spacecraft activity or state. On all three days, the spacecraft appears to be set up for 1-way if we believe the SOE/DKF. There are 60-120 second differences between predicted occultation and observed loss-of-signal. On day 098 the SOE tells us ranging and telemetry go off AFTER the predicted occultation while on the other two days they go off well before. But we see the same carrier levels (including a very brief amplitude spike just before occultation) on days 098 and 099; on day 100, the levels are very different and there is no spike. Over the three days, the best correlation between SOE/DKF and actual signal behavior is the SOE entry "SET DOWNLINK BAND: NONE". The carrier disappears within 5 seconds of this entry on each day. I have no idea what the entry means. Day 098 (DSS 54; X-band only) ----------------------------- 20:17:57 DKF (xd013b.00.dkf) says BEGIN RADIO SCIENCE FIX SUBREFLECTOR 20:28:00 Begin queried data processed at Stanford (8 ksps) Carrier stable (-11 dB with respect to A/D maximum) 20:29:48 SOE (xd013b.00.tsoe) says MEX went 1-way Nothing seen in data 20:33:33 SOE says spacecraft went into Earth occultation 20:34:31 SOE says RANGING OFF TELEMETRY OFF SET DOWNLINK BAND: NONE 20:34:31 Signal rose to -6 dB with respect to A/D maximum; then disappeared (the real occultation?) The one minute error in predicting occultation time means that there were many changes in spacecraft configuration at exactly the time the real occultation took place. It is not clear why the spacecraft went into occultation with telemetry and ranging ON; maybe this was not a radio science activity despite the DKF. Day 099 (DSS 54; X-band only) ----------------------------- 18:41:35 SOE and DKF say telemetry and ranging OFF 19:02:48 DKF says BEGIN RADIO SCIENCE FIX SUBREFLECTOR 19:10:00 Begin queried data processed at Stanford (2 ksps) Carrier stable (-10 dB with respect to A/D maximum) 19:14:37 SOE says MEX went 1-way Nothing seen in data 19:18:22 SOE says MEX enters occultation 19:19:35 SOE says SET DOWNLINK BAND: NONE 19:19:40 Signal rose to -4 dB with respect to A/D maximum; then disappeared (the real occultation?) In the SOE and DKF this looks like the right preparation for an occultation (except for MEX being 1-way). But the signal observed is hardly distinguished from what we see on 098 - very stable and well below A/D saturation, then a big spike in amplitude just before occultation, which is 108 seconds later than predicted. Day 100 (DSS 65; X-band only) ----------------------------- 17:26:38 SOE says telemetry and ranging OFF 17:47:43 DKF says BEGIN RADIO SCIENCE FIX SUBREFLECTOR 17:55:00 Begin queried data processed at Stanford (2 ksps) Carrier level oscillating between -4 and -5 dB below A/D maximum (approx 2 min period) 17:59:31 SOE and DKF say begin 1-way Nothing seen in data 18:03:16 SOE says MEX enters occultation 18:04:39 SOE says SET DOWNLINK BAND: NONE 18:04:43 Signal disappears The preparation for this occultation appears to be very similar to that on day 099; but the carrier is 5-10 dB stronger, it oscillates, and it disappears without the amplitude spike seen on the previous two days. There are several spurs in the power spectra at 150-250 Hz from the carrier. These may be from power line modulation; SNR is nearly 59 dB/Hz in these data and we frequently see spurs at multiples of 50 and/or 60 Hz when SNR is this high. Regards, Dick