PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 144 FILE_RECORDS = 294924 ^HEADER_TABLE = ("4156155B.SPC",1) ^DATA_TABLE = ("4156155B.SPC",13) INSTRUMENT_HOST_NAME = "MAGELLAN" INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" TARGET_NAME = VENUS OBSERVATION_TYPE = "BISTATIC RADAR" DATA_SET_ID = "MGN-V-RSS-4-BSR-V1.0" DSN_STATION_NUMBER = 63 PRODUCT_ID = "4156155B.SPC" START_TIME = 1994-06-05T15:58:12 STOP_TIME = 1994-06-05T16:46:12 PRODUCT_CREATION_TIME = 2008-03-25T23:11:00 PRODUCER_ID = "SUE" PRODUCT_TYPE = SPC DESCRIPTION = " This file contains calibrated echo spectra from MAGELLAN (MGN) bistatic radar experiments, collected using antennas and 'open loop' receivers at stations of the NASA Deep Space Network (DSN). The processing was carried out at Stanford University. These data have been processed so that the surface echo is approximately centered in the frequency window. The file consists of two ASCII tables. A header table identifies source data from which the file was constructed. The data table includes the actual spectra." OBJECT = HEADER_TABLE INTERCHANGE_FORMAT = ASCII ROWS = 12 COLUMNS = 4 ROW_BYTES = 144 DESCRIPTION = " This table identifies source files used in construction of the data table, which follows. There is one row for each receiver channel; each row contains the name of three files: the input PRP file with time samples the noise spectrum used to equalize (flatten) the spectrum) the gain table used to calibrate the amplitude of the sample values If either the noise spectrum or the gain file is 'N/A', users should consider the corresponding spectra not to be fully calibrated. Each row in the table ends with an ASCII carriage-return line-feed pair in positions 143 and 144." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "CHANNEL" DATA_TYPE = CHARACTER START_BYTE = 2 BYTES = 2 DESCRIPTION = "The PRP channel, given as the band and polarization. Possible values are: XR SR XL SL The order of the rows is not important; but all four must be included." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "PRP FILE NAME" DATA_TYPE = CHARACTER START_BYTE = 11 BYTES = 12 DESCRIPTION = "Name of the PRP file providing time series input to the power spectrum analysis. If none, set to 'N/A'." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "EQUALIZATION FILE NAME" DATA_TYPE = CHARACTER START_BYTE = 46 BYTES = 12 DESCRIPTION = "Name of the file used to equalize (or flatten) the PRP spectrum during the bistatic radar experiment. If none, set to 'N/A'." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "GAIN FILE NAME" DATA_TYPE = CHARACTER START_BYTE = 81 BYTES = 12 DESCRIPTION = "Name of the file used to set the calibrated amplitude of the PRP samples during the bistatic radar experiment. If none, set to N/A." END_OBJECT = COLUMN END_OBJECT = HEADER_TABLE OBJECT = DATA_TABLE INTERCHANGE_FORMAT = ASCII ROWS = 294912 COLUMNS = 12 ROW_BYTES = 144 DESCRIPTION = " This table contains averaged calibrated echo spectra from a MAGELLAN (MGN) bistatic radar experiment, collected using antennas and 'open loop' receivers at stations of the NASA Deep Space Network (DSN). The processing was carried out at Stanford University. Open loop receivers sample a spectral window (typically 25 kHz in this case) centered on the expected MGN frequency. The samples x(t) can later be calibrated against known standards for absolute amplitude and Fourier transformed to voltage spectra X(f). Power spectra can be computed for single channels X(f)*conj[X(f)]; cross spectra can be computed when a coherent second channel y(t) with orthogonal circular polarization is available X(f)*conj[Y(f)]. This table contains power spectra from X-band right- and left-circular polarization (X-RCP and X-LCP, respectively) and from S-band right- and left-circular polarization (S-RCP and S-LCP, respectively). It also contains (complex) cross-spectra from X-band and S-band. In cases where data from one or more channels are not available, the respective entries in the table are filled with zeroes. Values are given in units of zeptowatts (10^-21 watts)." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "SPECTRUM NUMBER" DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 6 UNIT = "N/A" FORMAT = "I6" DESCRIPTION = "Sequence number for the set of spectra, starting from 1." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "CENTER TIME" DATA_TYPE = ASCII_REAL START_BYTE = 8 BYTES = 13 UNIT = "SECOND" FORMAT = "F13.6" DESCRIPTION = "Center time of the interval over which the average spectra were computed, in seconds from midnight." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "BIN NUMBER" DATA_TYPE = ASCII_INTEGER START_BYTE = 22 BYTES = 6 UNIT = "N/A" FORMAT = "I6" DESCRIPTION = "The number of the frequency bin within a spectrum, starting from 1 at the lowest frequency bin." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "FREQUENCY" DATA_TYPE = ASCII_REAL START_BYTE = 29 BYTES = 10 UNIT = "HERTZ" FORMAT = "F10.3" DESCRIPTION = "The frequency corresponding to BIN NUMBER. The reference frequency is not specified. The default is to set FREQUENCY = 0. at BIN NUMBER = 1. If not, the user should assume that FREQUENCY = 0. was chosen to be the frequency of the carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "X-RCP POWER" DATA_TYPE = ASCII_REAL START_BYTE = 40 BYTES = 12 UNIT = "ZEPTOWATT" FORMAT = "E12.3" DESCRIPTION = "The average power in the X-RCP receiver channel at CENTER TIME and in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "X-LCP POWER" DATA_TYPE = ASCII_REAL START_BYTE = 53 BYTES = 12 UNIT = "ZEPTOWATT" FORMAT = "E12.3" DESCRIPTION = "The average power in the X-LCP receiver channel at CENTER TIME and in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "S-RCP POWER" DATA_TYPE = ASCII_REAL START_BYTE = 66 BYTES = 12 UNIT = "ZEPTOWATT" FORMAT = "E12.3" DESCRIPTION = "The average power in the S-RCP receiver channel at CENTER TIME and in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "S-LCP POWER SPECTRUM" DATA_TYPE = ASCII_REAL START_BYTE = 79 BYTES = 12 UNIT = "ZEPTOWATT" FORMAT = "E12.3" DESCRIPTION = "The average power in the S-LCP receiver channel at CENTER TIME and in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "X-BAND CROSS SPECTRUM - MAGNITUDE" DATA_TYPE = ASCII_REAL START_BYTE = 92 BYTES = 12 UNIT = "ZEPTOWATT" FORMAT = "E12.3" DESCRIPTION = "Magnitude of the averaged XR*conj[XL] spectrum at CENTER TIME in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "X-BAND CROSS SPECTRUM - PHASE" DATA_TYPE = ASCII_REAL START_BYTE = 105 BYTES = 12 UNIT = "RADIAN" FORMAT = "E12.3" DESCRIPTION = "Phase of the averaged XR*conj[XL] spectrum at CENTER TIME in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "S-BAND CROSS SPECTRUM - MAGNITUDE" DATA_TYPE = ASCII_REAL START_BYTE = 118 BYTES = 12 UNIT = "ZEPTOWATT" FORMAT = "E12.3" DESCRIPTION = "Magnitude of the averaged SR*conj[SL] spectrum at CENTER TIME in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "S-BAND CROSS SPECTRUM - PHASE" DATA_TYPE = ASCII_REAL START_BYTE = 131 BYTES = 12 UNIT = "RADIAN" FORMAT = "E12.3" DESCRIPTION = "Phase of the averaged SR*conj[SL] spectrum at CENTER TIME in BIN NUMBER, including surface echo, radio thermal noise, and (possibly) the directly propagating carrier signal reaching Earth via a spacecraft antenna sidelobe." END_OBJECT = COLUMN END_OBJECT = DATA_TABLE END