PDS_VERSION_ID = PDS3
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 178
FILE_RECORDS = 24227
INSTRUMENT_HOST_NAME = "MARS GLOBAL SURVEYOR"
TARGET_NAME = "MARS"
INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM"
DATA_SET_ID = "MGS-M-RSS-5-EDS-V1.0"
PRODUCT_ID = "RSS_OCCLOG.TAB"
PRODUCT_RELEASE_DATE = 2008-05-06
DESCRIPTION = "This file contains summary information for
each MGS radio occultation opportunity starting in December 2001. Data
are organized as a PDS TABLE object with 17 columns of fixed widths.
Columns include start/stop times for data acquisition, antenna number,
sample rate, filter width, DSP mode, bit resolution, record length,
number of records, number of missing records, maximum signal-to-noise
ratio, RSR file name, SOE file name, and comments. Columnar data and
delimiters require 176 bytes; these are followed by an ASCII
carriage-return and line feed, making the total line length equal to
178 bytes.
Orbit numbers in the keywords immediately below (START_ORBIT_NUMBER and
STOP_ORBIT_NUMBER) as well as in the COMMENTS column of the table itself
reflect the MGS Project decision to reinitialize orbit numbers to 1 at
the beginning of the MGS Mapping Phase. The numbers listed here may be
slightly different from the numbers kept by the MGS Project office;
there were operational advantages for the Radio Science Team to pair
ingress and egress occultations and this sometimes led to a discrepancy
depending on when the Project-defined orbit number changed relative to
the occultations.
This file was produced by the Mars Global Surveyor Radio Science Team, under
the direction of G. Leonard Tyler."
START_TIME = 2001-12-13T02:20:00
STOP_TIME = 2006-11-06T15:12:00
START_ORBIT_NUMBER = 12359
STOP_ORBIT_NUMBER = 34246
PRODUCT_CREATION_TIME = 2008-05-06T20:40:00
PRODUCER_FULL_NAME = "RICHARD A. SIMPSON"
PRODUCER_INSTITUTION_NAME = "STANFORD UNIVERSITY"
PRODUCT_VERSION_TYPE = "PRELIMINARY"
PRODUCER_ID = "MGS RST"
^RSR_OCCLOG_TABLE = "RSR_OCCLOG.TAB"
OBJECT = RSR_OCCLOG_TABLE
NAME = "RSR OCCULTATION LOG"
ROWS = 24227
COLUMNS = 17
ROW_BYTES = 178
ROW_SUFFIX_BYTES = 0
INTERCHANGE_FORMAT = ASCII
DESCRIPTION = "This OCCLOG table contains a summary line
from each Radio Science Receiver (RSR) radio occultation opportunity.
Each line contains 176 bytes of data followed by an ASCII carriage-return
line-feed pair. Character strings are enclosed by double quotes, fields
are delimited by commas; neither is counted in defining either START_BYTE
or BYTES."
OBJECT = COLUMN
NAME = "START TIME"
COLUMN_NUMBER = 1
DATA_TYPE = TIME
START_BYTE = 1
BYTES = 19
DESCRIPTION = "The date and time of the first RSR sample
in the data file. Format is YYYY-MM-DDThh:mm:ss
where
YYYY is the 4-digit year
MM is the 2-digit month
DD is the 2-digit day-of-month
hh is the 2-digit hour
mm is the 2-digit minute
ss is the 2-digit second
and time reference system is UTC. Time may be blank if no data were
collected."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "STOP TIME"
COLUMN_NUMBER = 2
DATA_TYPE = TIME
START_BYTE = 21
BYTES = 19
DESCRIPTION = "The date and time of the last integer
second time tag in the data file. Format is YYYY-MM-DDThh:mm:ss
where
YYYY is the 4-digit year
MM is the 2-digit month
DD is the 2-digit day-of-month
hh is the 2-digit hour
mm is the 2-digit minute
ss is the 2-digit second
and time reference system is UTC. May be blank or partly blank if no
data were collected."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "DSN TRACKING MODE"
COLUMN_NUMBER = 3
DATA_TYPE = ASCII_INTEGER
START_BYTE = 41
BYTES = 1
FORMAT = "I1"
DESCRIPTION = "DSN tracking mode is 1 if the spacecraft
is transmitting with no uplink frequency reference, 2 is there is an
uplink reference from the receiving station, and 3 of there is an
uplink reference from another ground station."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "UPLINK DSS"
COLUMN_NUMBER = 4
DATA_TYPE = ASCII_INTEGER
START_BYTE = 43
BYTES = 2
FORMAT = "I2"
DESCRIPTION = "The number of the DSN antenna used to
transmit the uplink frequency reference, or 0 if none. See ANTENNA
NUMBER (below) for more information."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "ANTENNA NUMBER"
COLUMN_NUMBER = 5
DATA_TYPE = ASCII_INTEGER
START_BYTE = 46
BYTES = 2
FORMAT = "I2"
DESCRIPTION = "The number of the DSN antenna used to
collect the open-loop occultation data. 70-m antennas include DSS 14,
43, and 63; 34-m high-efficiency (HEF) antennas include DSS 15, 45, and
65. 34-m beam-waveguide (BWG) antennas include DSS 25, 34, and 54."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "RSR ID"
COLUMN_NUMBER = 6
DATA_TYPE = ASCII_INTEGER
START_BYTE = 49
BYTES = 2
FORMAT = "I2"
DESCRIPTION = "The identifier of the Radio Science
Receiver (RSR) within the DSN complex. A number between 1 and 16."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "RSR SUBCHANNEL ID"
COLUMN_NUMBER = 7
DATA_TYPE = ASCII_INTEGER
START_BYTE = 52
BYTES = 1
FORMAT = "I1"
DESCRIPTION = "The identifier of the Radio Science
Receiver subchannel. A number between 1 and 4."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "SAMPLE RATE"
COLUMN_NUMBER = 8
DATA_TYPE = ASCII_INTEGER
START_BYTE = 54
BYTES = 5
FORMAT = "I5"
UNIT = "KILOSAMPLE PAIRS PER SECOND"
DESCRIPTION = "The sampling rate for the channel in
the data file. Complex (I/Q) samples were taken; this is the rate
of I/Q pairs. Nominal rate for MGS radio occultations was 2 ksps.
Left blank or set to 0 if no data."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "BIT RESOLUTION"
COLUMN_NUMBER = 9
DATA_TYPE = ASCII_INTEGER
START_BYTE = 60
BYTES = 2
FORMAT = "I2"
UNIT = "BIT"
DESCRIPTION = "The number of bits in each individual
I and Q sample. Nominally 16 for the sampling rate of 2 ksps (32 bits
for the I/Q pair). Left blank or set to 0 if no data."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "RECORD LENGTH"
COLUMN_NUMBER = 10
DATA_TYPE = ASCII_INTEGER
START_BYTE = 63
BYTES = 5
FORMAT = "I5"
UNIT = "BYTE"
DESCRIPTION = "The number of bytes in each logical
record in the file. For nominal operations usually 8260 bytes of which
260 bytes were header and the remaining 8000 bytes contained 2000
16-bit I and 16-bit Q pairs. Left blank or set to 0 if no data."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "NUMBER OF RECORDS"
COLUMN_NUMBER = 11
DATA_TYPE = ASCII_INTEGER
START_BYTE = 69
BYTES = 6
FORMAT = "I6"
UNIT = "N/A"
DESCRIPTION = "The number of records in the file.
Number of records multiplied by the record length (Column 8) should
equal the file size in bytes. Left blank or set to 0 if no data."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "MAXIMUM SIGNAL-TO-NOISE RATIO"
COLUMN_NUMBER = 12
DATA_TYPE = ASCII_REAL
START_BYTE = 76
BYTES = 5
FORMAT = "F5.1"
UNIT = "DECIBEL PER HERTZ"
DESCRIPTION = "The maximum carrier-to-noise level during
times when the spacecraft was not occulted by the planet. Based on 60-
second power spectra with 5 Hz resolution (typically), calculated by
program FNDLOOK. Left blank or set to 0 if no data."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "SYSTEM TEMPERATURE"
COLUMN_NUMBER = 13
DATA_TYPE = ASCII_REAL
START_BYTE = 82
BYTES = 6
FORMAT = "F6.2"
UNIT = "KELVIN"
DESCRIPTION = "The system temperature of the open-loop
receiving system, read from displays at the Jet Propulsion Laboratory,
usually during ingress. Set to 0 or left blank if unknown."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "RSR FILE NAME"
COLUMN_NUMBER = 14
DATA_TYPE = CHARACTER
START_BYTE = 90
BYTES = 12
FORMAT = "A12"
UNIT = "N/A"
DESCRIPTION = "The name of the file containing RSR
records (headers plus data samples). Files have names of the form
YDDDhhmm.RSR
where
Y is the 1-digit year of the first data sample
DDD is the 3-digit day-of-year of the first data sample
hh is the 2-digit hour of the first data sample
mm is the 2-digit minute of the first data sample (in
cases where more than one file has the same
YDDDhhmm the additional names are modified by
converting the second digit in mm to a letter.
Left blank if data acquisition was unsuccessful."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "SOE FILE NAME"
COLUMN_NUMBER = 15
DATA_TYPE = CHARACTER
START_BYTE = 105
BYTES = 16
FORMAT = "A16"
UNIT = "N/A"
DESCRIPTION = "The name of the controlling Sequence of
Events file when the data were collected. This is the original file
name, as it appeared in the MGS Central Data Base. Typical file names
had the form
mmNNNc.vv.tsoe
where
mm identifies this as a Mars Mapping SOE
NNN is the Mapping Cycle number
c is the planning version for the Mapping Cycle (a letter)
vv is the version of the SOE
SOE files in the MGS Radio Science Team server are renamed according to
to an 8.3 file naming convention. But it may be possible to search for
the original file name using either the MGS RST data base or index
files. Left blank if not known or if irrelevant (data acquisition was
not successful)."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "QUALITY"
COLUMN_NUMBER = 16
DATA_TYPE = CHARACTER
START_BYTE = 124
BYTES = 3
FORMAT = "A3"
UNIT = "N/A"
DESCRIPTION = "Data quality indicator.
First character indicates expectation from observation:
A HGA, scheduled occultation; high-quality science expected
B Lower quality data expected (e.g., spacecraft using LGA)
C Non-occultation observation (e.g., USO test)
D Observation opportunity, but not scheduled
Second character indicates results:
0 No data, or data irreparably corrupted
1 Data badly corrupted; no present plan to attempt recovery
2 Seriously degraded data, from causes beyond control
(e.g., weather)
3 Seriously degraded data from causes associated with equipment
4 Minor degradations (SNR 6 dB low, frequency residuals,
missing records, baseline unstable, uplink ramping)
5 No known problems
Third character gives main cause for degradation (if any):
a all OK
b baseline unstable or too short
d receiver failure
e equipment failure (other than receiver or ground data system)
f frequency instabilities/residuals
g data lost in ground data system (GDS)
l incorrect level setting (attenuation)
m missing records
n low carrier-to-noise, or unstable noise level
o operator error
p POCA
r ripple (spectral or temporal)
s sawtooth frequency residual
t tuning or timing (orbit) problem
u spurs
w weather
x not applicable
y unknown
z multiple problems"
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "COMMENTS"
COLUMN_NUMBER = 17
DATA_TYPE = CHARACTER
START_BYTE = 130
BYTES = 46
FORMAT = "A46"
UNIT = "N/A"
DESCRIPTION = "Terse comments, usually indicating the
number of the occultation or any problems with the data. Most comment
fields begin with
nnnnnx:m
where
nnnnn is the 5-digit orbit number, where orbit 1 was the
first orbit in the MGS Mapping phase
x denotes ingress (i) or egress (e)
m is a quality indicator for any observed surface echo
- no surface echo expected (e.g., test data)
0 none seen in processing to date
1 hint of a surface echo
2 weak but persistent surface echo
3 moderately strong, often with amplitude variations
4 very strong
5 extremely strong (among top 1 percent)"
END_OBJECT = COLUMN
END_OBJECT = RSR_OCCLOG_TABLE
END
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