urn:nasa:pds:magellan_bsr_calibrated:spc:4156130b 1.0 1.22.0.0 Product_Observational 2025-01-27 1.0 Product migrated to PDS4 from PDS3. 1994-06-05T13:09:31Z 1994-06-05T13:41:31Z Magellan Mission urn:nasa:pds:context:investigation:mission.magellan data_to_investigation Alias: Venus Radar Mapper Magellan Host urn:nasa:pds:context:instrument_host:spacecraft.mgn is_instrument_host Radio Science Subsystem Instrument urn:nasa:pds:context:instrument:mgn.rss is_instrument Venus Planet urn:nasa:pds:context:target:planet.venus data_to_target BSR 63 SUE SPC 4156130b.spc 2008-03-26T22:11:00 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. HEADER_TABLE 0 8 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. Carriage-Return Line-Feed 4 0 144 CHANNEL 1 2 ASCII_String 2 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. PRP FILE NAME 2 11 ASCII_String 12 Name of the PRP file providing time series input to the power spectrum analysis. If none, set to 'N/A'. EQUALIZATION FILE NAME 3 46 ASCII_String 12 Name of the file used to equalize (or flatten) the PRP spectrum during the bistatic radar experiment. If none, set to 'N/A'. GAIN FILE NAME 4 81 ASCII_String 12 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. DATA_TABLE 1152 196608 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). Carriage-Return Line-Feed 12 0 144 SPECTRUM NUMBER 1 1 ASCII_Integer 6 Sequence number for the set of spectra, starting from 1. CENTER TIME 2 8 ASCII_Real 13 second Center time of the interval over which the average spectra were computed, in seconds from midnight. BIN NUMBER 3 22 ASCII_Integer 6 The number of the frequency bin within a spectrum, starting from 1 at the lowest frequency bin. FREQUENCY 4 29 ASCII_Real 10 hertz 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. X-RCP POWER 5 40 ASCII_Real 12 zeptowatt 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. X-LCP POWER 6 53 ASCII_Real 12 zeptowatt 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. S-RCP POWER 7 66 ASCII_Real 12 zeptowatt 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. S-LCP POWER SPECTRUM 8 79 ASCII_Real 12 zeptowatt 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. X-BAND CROSS SPECTRUM - MAGNITUDE 9 92 ASCII_Real 12 zeptowatt 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. X-BAND CROSS SPECTRUM - PHASE 10 105 ASCII_Real 12 radian 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. S-BAND CROSS SPECTRUM - MAGNITUDE 11 118 ASCII_Real 12 zeptowatt 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. S-BAND CROSS SPECTRUM - PHASE 12 131 ASCII_Real 12 radian 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. 4156130b.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed