PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM STANDARD_DATA_PRODUCT_ID = HEA DATA_SET_ID = "VEX-V-VRA-1/2/3-NMP-0114-V1.0" PRODUCT_ID = "V00SUE0L1A_HEA_071470544_00.TXT" PRODUCT_CREATION_TIME = 2014-02-11T09:50:14.000 PRODUCER_ID = "SUE" INSTRUMENT_HOST_ID = "VEX" OBJECT = TEXT PUBLICATION_DATE = 2007-06-15 NOTE = "DSN VEX Data Collection" END_OBJECT = TEXT END Miscellaneous ============= This is the first report since HEA7127A.TXT. Open Loop Data ============== Data Collection --------------- We have completed quick-look processing on the following VEX RSR open loop radio occultation data at Stanford: DOY DSS RSR BAND RSR CH KSPS BT REC RECS RSR MAX START STOP ID RS LEN FILE NAME SNR --- --- -------- -------- ---- --- -- ---- -- ----- ----- ------------ ----- 145 43 05:26:00 07:05:00 -/XR 4 3 16 16 16260 23764 7145052A.RSR 68.5 145 43 05:26:00 07:05:00 -/SR 3 2 8 16 16260 11882 7145052B.RSR 19.8 147 43 05:44:00 06:55:00 -/XR 4 2 16 16 16260 17044 7147054A.RSR 68.8 147 43 05:44:00 06:01:59 -/SR 3 4 100 16 20260 21600 7147054B.RSR 20.8 147 43 06:02:00 06:19:59 -/SR 3 4 100 16 20260 21600 7147060B.RSR 20.7 147 43 06:20:00 06:37:59 -/SR 3 4 100 16 20260 21600 7147062B.RSR 17.3 147 43 06:38:00 06:55:00 -/SR 3 4 100 16 20260 20420 7147063B.RSR 21.3 151 43 05:25:01 07:00:00 -/XR 4 1 16 16 16260 22800 7151052A.RSR 0.0 151 43 05:25:01 07:00:00 -/XR 4 1 16 16 16260 22800 7151052A.RSR 69.9 160 43 05:45:00 07:00:00 -/XR 4 1 2 16 8260 4501 7160054A.RSR 60.1 160 43 05:45:00 07:00:00 -/SR 3 1 2 16 8260 4501 7160054B.RSR -4.1 Anomalies --------- Operations through day 151 used the VEX HGA1 antenna. In early June the spacecraft began using HGA2, which has about 10 dB less gain at X-Band. The MAX SNR measured on day 160 is 9.8 dB lower than on day 151. HGA2 has no S-Band feed. The X-Band quick-look plots are as expected for a deep occultation (the occultation on day 146 was closest to diametric). Receiver tuning was based on geometric predictions adjusted for a model Venus atmosphere. In the data summarized above, the tuning seems to have been very good on ingress but the signal strayed as much as +4 kHz from the center frequency -- mostly after egress. There is a weak S-Band signal in all recordings for which S-Band data were taken. The signal seems to come and go approximately as one might expect based on the X-Band behavior. But it is always drifting (usually toward lower frequencies), suggesting that the S-Band tuning predicts were very different from those used at X-Band. On day 147, when S-Band was recorded using a 100 kHz bandwidth, the signal was present for almost the entire occultation, drifting first negative, then crossing back over zero, and finally returning to the center frequency (from the positive side) at about the time the X-Band occultation ended. But it continued drifting more negative (to about -20 kHz from center) and ended about 9 kHz below the center frequency. The evidence in hand suggests that the S-Band signal seen in these recordings is NOT from the Venus Express spacecraft. But it is hard to come up with an explanation, so the cautious analyst might carry the S-Band data along until more convincing arguments are found to rule out VEX as the source. There is minor clipping of the 100 kHz S-Band signal recorded on day 147. The original recording comprised nearly 1.8 GB, which would have been impossible to process using the Stanford software. So the file was divided into four continguous segments of 18 minutes each, except that the fourth file is 17 minutes. Closed Loop Data ================ Data Collection --------------- We have collected, labeled, and stored the following closed-loop data on our system at Stanford. The files are also being copied to the MaRS jupiter system where they will appear in directories /raid0/stanford/VEX/{ODF,TNF}. The following are ODF's at one-second sampling. FILE NAME START TIME STOP TIME FILE SIZE YYYY-MM-DDThh:mm:ss YYYY-MM-DDThh:mm:ss (bytes) ------------ ------------------- ------------------- ---------- 7127127A.ODF 2007-05-07T05:09:30 2007-05-07T06:45:04 0000185472 7145145A.ODF 2007-05-25T05:27:49 2007-05-25T07:05:38 0000112896 7145145B.ODF 2007-05-25T05:28:42 2007-05-25T07:05:05 0000129024 7147147A.ODF 2007-05-27T05:27:24 2007-05-27T07:05:45 0000129024 7151151A.ODF 2007-05-31T05:25:08 2007-05-31T07:07:05 0000137088 7160160A.ODF 2007-06-09T05:59:51 2007-06-09T07:10:36 0000016128 7160160B.ODF 2007-06-09T05:38:43 2007-06-09T07:10:01 0000129024 7163163A.ODF 2007-06-12T05:04:34 2007-06-12T07:03:16 0000161280 The following are TNF's (TRK-2-34 data) from individual DSN passes: FILE NAME START TIME STOP TIME FILE SIZE YYYY-MM-DDThh:mm:ss YYYY-MM-DDThh:mm:ss (bytes) ------------ ------------------- ------------------- ---------- 7127E43A.TNF 2007-05-07T04:10:00 2007-05-07T07:05:00 0003639976 7145E43A.TNF 2007-05-25T04:20:00 2007-05-25T07:25:00 0004466064 7147E43A.TNF 2007-05-27T04:25:00 2007-05-27T07:30:00 0003355936 7151E43A.TNF 2007-05-31T04:25:00 2007-05-31T07:35:00 0003468618 7160E43A.TNF 2007-06-09T04:30:00 2007-06-09T07:35:00 0003435224 7163B43A.TNF 2007-06-12T01:20:00 2007-06-12T09:00:00 0006575004 Ancillary Data ============== Data Collection --------------- We have collected, labeled, and stored the following ancillary data on our system at Stanford. The files have also been copied to the MaRS jupiter system where they appear in directories /raid0/stanford/VEX/{ION,TRO,WEA}. ION files are ionosphere media calibration files and TRO files are troposphere media calibration files; each file covers (approximately) one month. ION and TRO files included here cover May 2007. WEA files are meteorological data files (one for each DSN complex). Each file is cumulative for the year; these cover the first 162 days of 2007. FILE NAME START TIME STOP TIME FILE SIZE YYYY-MM-DDThh:mm:ss YYYY-MM-DDThh:mm:ss (bytes) ------------ ------------------- ------------------- ---------- 7121152A.ION 2007-05-01T03:27:00 2007-06-01T06:21:00 0000060264 7121152A.TRO 2007-05-01T03:00:00 2007-06-01T03:00:00 0000223070 70011621.WEA 2007-01-01T00:00:00 2007-06-11T23:59:59 0000482781 70011624.WEA 2007-01-01T00:00:00 2007-06-11T23:59:59 0000498758 70011626.WEA 2007-01-01T00:00:00 2007-06-11T23:59:59 0000488548