PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 1996-12-30 NOTE = "N/A" END_OBJECT = TEXT END Magellan Bistatic Radar Raw Data Archive (MGN-V-RSS-1-BSR-V1.0) ERRATA.TXT 30 December 1996 R.A. Simpson Stanford University 96-10-30 (ODR File Errors) ========================== MG_2301/ODR/32791324.ODR: The narrow-band occultation converter (NBOC) reported over 14000 lost records during the 8 minutes 17 seconds covered by this file; only 8508 records were written to tape. A quick check of header information suggests that things like record numbers are continuous, which means that large blocks of samples simply never made it to tape. It is likely that samples within 4166 byte records are contiguous but that there are frequent gaps between records. A careful user may still be able to work with these data, allowing for some uncertainty in absolute time of samples. MG_2301/ODR/3279{1942,1950,2117,2125}.ODR: Starting at 19:50:16.750 a modulation appeared on all four receiver channels. The modulation period was 2 seconds and it continued through the end of the second file (19:58:40). Starting again at 21:19:57.750 the same modulation continued through the end of the second pair of files (21:33:20). It appears that both S-band channels have similar values after modulation begins, and that both X-band channels are also similar. This suggests that a pair of samples is lost every 2 seconds, effectively switching the polarization of each channel to its opposite circular sense. Working with these data could be challenging. MG_2303/33131107.ODR: The following 21 ODR records are missing: 12997 12999 13002 13008 13013 13014 13017 13018 15302 16411 16412 16421 16423 16475 16486 17187 17651 17805 17809 17819 17821 MG_2304/ODR/33131226.ODR: Record #51 is missing. There are also 43 extra records in this file--compared to what would be expected normally and suggesting that the data acquisition system was not entirely dependable. The following files were delivered with data records truncated to 566 bytes rather than the normal 4166. The cause for this was never determined. The records on the archival volumes have been padded to 4166 bytes with binary zeroes. MG_2304/ODR/33131242.ODR MG_2305/ODR/33131250.ODR 33131253.ODR 33131259.ODR 33131307.ODR 33131315.ODR 33131323.ODR MG_2309/ODR/41561425.ODR MG_2310/ODR/41561513.ODR 41561731.ODR MG_2311/ODR/41561819.ODR MG_2312/ODR/41562037.ODR MG_2306/ODR/41511231.ODR: The tape file included TWO 32-byte label records. But the data were recovered successfully. MG_2309/ODR/41561425.ODR: Record #18974 is missing. MG_2310/ODR/41561513.ODR: The following records are missing: 1 2 15 16 MG_2310/ODR/41561731.ODR: Record #18207 is missing. The following ODR files were not readable from tape. Tapes were tried on at least one computer system at JPL and two at Stanford. Start Date/Time Stop Date/Time DSS ------------------- ------------------- ----- 1994-06-05T19:02:27 1994-06-05T19:10:01 14 1994-06-05T19:49:44 1994-06-05T20:01:25 14 1994-06-05T20:52:10 1994-06-05T20:55:38 14 1994-06-05T21:11:54 1994-06-05T21:27:53 14 1994-06-05T22:25:09 1994-06-05T22:41:08 14 1994-06-05T22:57:09 1994-06-05T23:06:53 14 1994-06-05T23:55:53 1994-06-06T00:11:52 14 MG_2312/ODR/41562037.ODR: Record #18511 is missing. 1996-10-30 (Other Anomalous Conditions) ======================================= MG_2306/ODR/4151{1131,1139}.ODR: These were test/calibration tapes, created before actual tracking began. MG_2306/ODR/4151{1215,1223}.ODR: Modulation of unknown source with peak-to-peak amplitude of about 0.5 dB and period of about 12 secs can be seen in X-RCP power vs time plot. Modulation is either not present or far less apparent on X-LCP (the stronger of the X-band channels), and it disappears when the spacecraft begins its turn toward the target. MG_2312/ODR/41561852.ODR: This tape from DSS 14 contains pre-cal data. 1996-12-30 (Errors Discovered During Production) ================================================ MG_2301 through MG_2307/DOCUMENT/FILELIST.LBL: There is a spurious ^TABLE pointer within the OBJECT=TABLE definition. The pointer in line 5 of the label is sufficient. The second pointer was removed in MG_2308.