PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 924 FILE_RECORDS = 234 ^TABLE = "USOA1032.TAB" DATA_SET_ID = "MGS-M-RSS-1-MAP-V1.0" PRODUCT_ID = "USOA1032.TAB" PRODUCT_TYPE = USO INSTRUMENT_HOST_NAME = "MARS GLOBAL SURVEYOR" INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" TARGET_NAME = MARS PRODUCT_CREATION_TIME = 2007-09-04T22:45:00Z MISSION_NAME = "MARS GLOBAL SURVEYOR" MISSION_PHASE_NAME = "MAPPING" ORBIT_NUMBER = "N/A" START_TIME = 1996-11-14T00:00:00Z STOP_TIME = 2001-02-01T23:59:59Z OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = 234 COLUMNS = 16 ROW_BYTES = 924 ROW_SUFFIX_BYTES = 0 DESCRIPTION = "This table contains Allan Deviation (AD) estimates for the Mars Global Surveyor (MGS) UltraStable Oscillator (USO). These estimates were derived from open-loop data collected at DSN stations while the MGS carrier was referenced to the USO. Each row, or record, in the table gives the AD at one integration time. There are 4-6 integration times (and 4-6 rows in the table) for each set of measurements. Columns in the table give measurement number, phase of that measurement procedure (if any), year and day of year, spacecraft antenna used, ground antenna used, approximate carrier to noise ratio, status of the Ka-Band transmitter, orbit number, sense of the nearest occultation (if any), test name or mission phase, number of missing records in the data stream, telemetry modulation state, ranging modulation state, amount of data available, AD integration time, and Allan Deviation. The data fields occupy 96 bytes; each row is delimited by an ASCII carriage-return line-feed pair." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "MEASUREMENT NUMBER" DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 3 FORMAT = "I3" UNIT = "N/A" DESCRIPTION = "The number of the measurement, starting from 1. Generally the MEASUREMENT NUMBER remained constant for a sigle DSN pass." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "MEASUREMENT PHASE" DATA_TYPE = CHARACTER START_BYTE = 6 BYTES = 1 FORMAT = "A1" UNIT = "N/A" DESCRIPTION = "Generally the MEASUREMENT NUMBER covered all measurements or tests conducted on a single day. When there were multiple measurement configurations, each configuration was given a phase identifier - a letter A, B, C, etc. Left blank if there was a single configuration." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "MEASUREMENT DATE" DATA_TYPE = DATE START_BYTE = 9 BYTES = 8 FORMAT = "N/A" UNIT = "N/A" DESCRIPTION = "The UTC year and day-of-year of the measurements in YYYY/DDD format." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "SPACECRAFT ANTENNA" DATA_TYPE = CHARACTER START_BYTE = 19 BYTES = 3 FORMAT = "A3" UNIT = "N/A" DESCRIPTION = "The spacecraft transmitting antenna used during the measurements. Either HGA for high-gain antenna or LGA for low-gain antenna." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "GROUND ANTENNA" DATA_TYPE = ASCII_INTEGER START_BYTE = 24 BYTES = 3 FORMAT = "I3" UNIT = "N/A" DESCRIPTION = "The DSN designation of the antenna used to collect the data. Commonly used antennas included 15, 45, and 65 the HEFs in Goldstone, Canberra, and Madrid, respectively." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "CARRIER TO NOISE RATIO" DATA_TYPE = ASCII_INTEGER START_BYTE = 28 BYTES = 3 FORMAT = "I3" UNIT = "DECIBEL PER HERTZ" DESCRIPTION = "The ratio of the carrier strength to the effective radiothermal background noise level, calculated from the measurements." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "KABLE STATUS" DATA_TYPE = CHARACTER START_BYTE = 33 BYTES = 3 FORMAT = "A3" UNIT = "N/A" DESCRIPTION = "Status of the Ka-Band Link Experiment while the measurements were being taken. Of most interest during the KaBLE Mode Test, when six possible KaBLE configurations were tried. Possible values include ON, OFF, and UNK." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "ORBIT NUMBER" DATA_TYPE = ASCII_INTEGER START_BYTE = 38 BYTES = 5 FORMAT = "I5" UNIT = "N/A" DESCRIPTION = "Orbit number when the measurements were collected, or blank if unknown or not applicable." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "OCCULTATION SENSE" DATA_TYPE = CHARACTER START_BYTE = 45 BYTES = 1 FORMAT = "A1" UNIT = "N/A" DESCRIPTION = "Set to E when the associated occultation was egress, set to I for ingress, or left blank if unknown or not applicable." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "TEST NAME" DATA_TYPE = CHARACTER START_BYTE = 49 BYTES = 6 FORMAT = "A6" UNIT = "N/A" DESCRIPTION = "A terse name identifying the test, mission phase if no specific test, or left blank if unknown or not applicable. Named tests included USO Tests (USO#nn) and the KaBLE Mode Test (KaBLE)." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "MISSING RECORDS" DATA_TYPE = ASCII_INTEGER START_BYTE = 57 BYTES = 2 FORMAT = "I2" UNIT = "N/A" DESCRIPTION = "The number of records missing from the data collected. Missing records can be identified by breaks in the record sequence numbers. Missing records can have severe impacts on Allan Deviation if not handled properly." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "TELEMETRY MODULATION STATUS" DATA_TYPE = CHARACTER START_BYTE = 61 BYTES = 3 FORMAT = "A3" UNIT = "N/A" DESCRIPTION = "The status of telemetry modulation during the measurements. Modulation reduces carrier strength, potentially increasing measured Allan Deviation. Possible values include ON, OFF, and UNK." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "RANGING MODULATION STATUS" DATA_TYPE = CHARACTER START_BYTE = 67 BYTES = 3 FORMAT = "A3" UNIT = "N/A" DESCRIPTION = "The status of ranging modulation during the measurements. Modulation reduces carrier strength, potentially increasing measured Allan Deviation. Possible values include ON, OFF, and UNK." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "LENGTH OF TEST" DATA_TYPE = ASCII_INTEGER START_BYTE = 72 BYTES = 3 FORMAT = "I3" UNIT = "MINUTE" DESCRIPTION = "The number of minutes of data collected. Allan Deviation can be calculated at long integration times only when long runs of data are available." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "INTEGRATION TIME" DATA_TYPE = ASCII_REAL START_BYTE = 76 BYTES = 9 FORMAT = "F9.4" UNIT = "SECOND" DESCRIPTION = "The spacing between points when calculating Allan Deviation." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "ALLAN DEVIATION" DATA_TYPE = ASCII_REAL START_BYTE = 86 BYTES = 11 FORMAT = "E11.4" UNIT = "SECOND" DESCRIPTION = "The spacing between points when calculating Allan Deviation (see D.W. Allan, Proc. IEEE, 54, 221-230, 1966)." END_OBJECT = COLUMN END_OBJECT = TABLE END