PDS_VERSION_ID = PDS3
DATA_SET_ID = "GO-E-PWS-2-EDR-E1WFRM-V1.0"
STANDARD_DATA_PRODUCT_ID = "80KHZ PWS WAVEFORM"
DATA_SET_PARAMETER_NAME = "PLASMA WAVE WAVEFORM"
PRODUCT_ID = "80KHZ_61176600"
PRODUCT_TYPE = "DATA"
PRODUCT_VERSION_ID = 1
PRODUCT_CREATION_TIME = 1994-07-01
FILE_NAME = "61176600.DAT"
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 7910
FILE_RECORDS = 93
START_TIME = 1990-343T22:42:24.667
STOP_TIME = 1990-343T22:43:25.266
SPACECRAFT_CLOCK_START_COUNT = "0/00611766:00:0:0"
SPACECRAFT_CLOCK_STOP_COUNT = "0/00611766:90:9:0"
INSTRUMENT_HOST_NAME = "GALILEO ORBITER"
INSTRUMENT_HOST_ID = "GO"
MISSION_PHASE_NAME = "EARTH 1 ENCOUNTER"
TARGET_NAME = {"EARTH", "SOLAR_SYSTEM"}
INSTRUMENT_NAME = "PLASMA WAVE RECEIVER"
INSTRUMENT_ID = "PWS"
INSTRUMENT_MODE_ID = "2"
INSTRUMENT_MODE_DESC = "80KHZ"
TELEMETRY_FORMAT_ID = "HPW"
TELEMETRY_APPLICATION_ID = "PWH4"
DATA_PATH_TYPE = "REALTIME"
DESCRIPTION = "
This file contains Galileo PWS 80KHZ waveform data acquired
between 1990-343T22:42:24.667 and 1990-343T22:43:25.266 during the
EARTH 1 ENCOUNTER mission phase."
^TEXT = ("61176600.DAT", 1)
^TABLE = ("61176600.DAT", 2)
^TIME_SERIES = ("61176600.DAT", 3)
OBJECT = TEXT
INTERCHANGE_FORMAT = "ASCII"
PUBLICATION_DATE = 1994-07-01
NOTE = "The ASCII text preceding the binary
data is a KEYWORD = VALUE type header with carriage return line feed
❮CR❯❮LF❯ 'line' terminators. Users are warned not to mistake the line
terminators with record terminators. The data file is fixed length
and this header text fills a single record."
END_OBJECT = TEXT
OBJECT = TABLE
NAME = WAVEFORM_HEADER
INTERCHANGE_FORMAT = "BINARY"
ROWS = 1
ROW_BYTES = 7910
COLUMNS = 46
^STRUCTURE = "EDRHDR_7910.FMT"
DESCRIPTION = "The first binary record of the data
file is another header which contains spacecraft, instrument, and
telemetry parameters associated with this data file."
END_OBJECT = TABLE
OBJECT = TIME_SERIES
NAME = WAVEFORM_DATA
INTERCHANGE_FORMAT = BINARY
COLUMNS = 1
ROWS = 91
ROW_BYTES = 7910
ROW_PREFIX_BYTES = 30
^ROW_PREFIX_STRUCTURE = "ROWPFX.FMT"
SAMPLING_PARAMETER_NAME = TIME
SAMPLING_PARAMETER_UNIT = SECOND
SAMPLING_PARAMETER_INTERVAL = 0.6667
NOTE = "There are 30 bytes of record header
data at the beginning of each data record. The content of the record
header is described by the ROWPFX.FMT file."
OBJECT = COLUMN
NAME = WAVEFORM_SAMPLES
DATA_TYPE = LSB_BIT_STRING
START_BYTE = 31
BYTES = 7880
ITEMS = 10
ITEM_BYTES = 788
DESCRIPTION = "
Each row of data covers one minor frame or mod91 count.
The row is divided again into 10 data blocks each starting on an RTI.
Within PWH4 data blocks there are 1576 4-bit waveform samples.
However not all data blocks necessarily contain data. Data blocks
that don't contain data are zero filled. The time tag for the start
of a data block is the time of RTI associated with that block.
Within a data block, the data are uniformly sampled in time at the
sampling frequency of the particular waveform mode. This value is
provided (SAMPLING_PARAMETER_INTERVAL) in the BIT_COLUMN description
below."
OBJECT = BIT_COLUMN
NAME = WAVEFORM_SAMPLE
BIT_DATA_TYPE = UNSIGNED_INTEGER
START_BIT = 1
ITEMS = 1576
ITEM_BITS = 4
SAMPLING_PARAMETER_NAME = TIME
SAMPLING_PARAMETER_UNIT = SECOND
SAMPLING_PARAMETER_INTERVAL = 0.00000496
DESCRIPTION = "Waveform sample value
Sample rate = 201600 samples/sec.
The waveform samples may be converted to floating point values
for analysis. For example, the 4 bit value stored in each ITEM
of the series could map to the following floating point value:
0 = -7.5 1 = -6.5 2 = -5.5 3 = -4.5
4 = -3.5 5 = -2.5 6 = -1.5 7 = -0.5
8 = 0.5 9 = 1.5 10 = 2.5 11 = 3.5
12 = 4.5 13 = 5.5 14 = 6.5 15 = 7.5"
END_OBJECT = BIT_COLUMN
END_OBJECT = COLUMN
END_OBJECT = TIME_SERIES
NOTE = "
All waveform data files are binary and have a fixed record length
structure. The first record is an ASCII header (padded to record
length) that contains many of the same parameters contained in this
label file. The next record is a binary header that also contains
much of the same information as this label. This label is derived
from the data file by reading these headers. The binary header record
is described in machine readable form by the PDS label file EDRHDR.FMT
and in a more human readable for in EDRHDR.TXT.
The remaining records contain data. Each data record has a 30 byte
header (prefix) followed by n (n=1 or 10) blocks of waveform samples.
In most cases, only a few of these data blocks contain data (the rest
may be zero filled). The file record length, the number of waveform
samples per data block, and the sampling frequency are dependent on
the spacecraft telemetry mode and the instrument mode. The following
table describes the variations in waveform data files:
APID Inst Mode* Tel-fmt Rec-Length Blocks/Rec Samples/Block
ID (bytes)
---------------------------------------------------------------------
PWH1 1,2,3 LPW 465 1 870
PWH2 1,2,3 MPW 670 10 128
PWH3 1,2 MPP 1630 10 320
PWH3 3 MPP 1080 10 210
PWH4 1,2 HPW 7910 10 1576
PWH4 3 HPW 1080 10 210
PWH5 1,2,3 LPW 4350 10 864
* 1=10 kHz, 2=80 kHz, 3=1kHz
Each data record contains data acquired in a single minor frame
(mod91=0.667 seconds). The time tag for the data record is located in
the row prefix header (ROWPRFX.FMT). The start time of a block of
waveform samples is the RTI in which the data block occurs (10 RTI
per minor frame, 0-9). Therefore if the waveform samples are located
in data block 3 and the row prefix header gives the time tag
03209117:27:0:0, then the samples begin at 03209117:27:2:0. The time
between samples is determined by the sampling frequency. There are
3150, 25200, 201600 samples per second in the 1 kHz, 10, kHz, and
80 kHz modes respectivley. Please note that in the PWH5 mode, there
are more samples than can be taken in a single RTI at the 1 kHz
sample rate. The waveform data are sampled uniformly and
continuously in a single data block, across the RTI boundaries.
These data are non-overlapping so that data cannot occur in all
of the data blocks for this mode/format combination.
Label START and STOP TIMES above refer respectively to the
beginning of the first and the last data record in this EDR
file. Each data record spans a sample time of 2/3 second
(= 1 MOD91 count)."
END
|