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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_61175300" PRODUCT_TYPE = "DATA" PRODUCT_VERSION_ID = 1 PRODUCT_CREATION_TIME = 1994-07-01 FILE_NAME = "61175300.DAT" RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 7910 FILE_RECORDS = 93 START_TIME = 1990-343T22:29:16.001 STOP_TIME = 1990-343T22:30:16.600 SPACECRAFT_CLOCK_START_COUNT = "0/00611753:00:0:0" SPACECRAFT_CLOCK_STOP_COUNT = "0/00611753:90:9:0" 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 1990-343T22:29:16.001 and 1990-343T22:30:16.600 during the EARTH 1 ENCOUNTER mission phase." ^TEXT = ("61175300.DAT", 1) ^TABLE = ("61175300.DAT", 2) ^TIME_SERIES = ("61175300.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 |