urn:nasa:pds:clementine1_bistatic:sort:srtnpwr 1.0 1.21.0.0 Product_Observational 2024-05-13 1.0 Product migrated to PDS4 from PDS3. 1994-04-09T18:36:45Z 1999-04-09T18:52:44Z Deep Space Program Science Experiment Mission urn:nasa:pds:context:investigation:mission.deep_space_program_science_experiment data_to_investigation Clementine 1 Clementine 1 Host urn:nasa:pds:context:instrument_host:spacecraft.clem1 is_instrument_host Radio Science Subsystem Instrument urn:nasa:pds:context:instrument:clem1.rss is_instrument Moon Satellite urn:nasa:pds:context:target:satellite.earth.moon data_to_target urn:nasa:pds:clementine1_bistatic:document:srtnpwr_reconstructed data_to_associate Reconstructed, complete version srtnpwr.tab 2000-04-12T16:25:00 NUMBER DISTRIBUTION 0 101 During migration from PDS3, it was discovered that the second field (NUMBER OF VALID POINTS) of this file contains only 63 of the 72 intended columns. A plausible reconstruction of the intended table, with all 72 columns, is included as SRTNPWR_RECONSTRUCTED.TAB in the same directory. The remaining text in this description comes from the original PDS3 label. This table gives the number of valid points at each (BETA,TARGET) location in SRTPWRL.TAB and SRTPWRR.TAB. Clementine bistatic radar echoes between 18:36:00 and 18:52:00 on 1994-04-09 were stored as 1464 1024-point power spectra. Every frequency bin in every spectrum can be associated with a contour of constant Doppler offset from the South Pole. Each contour comes closest to one of 72 'target' points defined on the surface. Target points are spaced by one second in time and satisfy the condition that the bistatic angle (BETA) passes through zero at some time during the experiment. The target points are given in BETAZER0.TAB and BETAZER1.TAB in the GEOMETRY directory of this archive. RCP echoes were sorted into array PWRR(BETA,TARGET,ELEMENT); LCP echoes were sorted into PWRL(BETA,TARGET,ELEMENT). TARGET depends on which target point fell within the 1.53 Hz Doppler bin. If none, the measurement was not included in the array. If yes, the value for TARGET was between 1 and 72, where the targets are in time order and 72 is the number of the final target point on the surface -- 6.5 seconds after South Pole closest approach. The bistatic angle was computed for the target selected at the time of the measurement. Bins of width 0.1 degree were defined centered on BETA = -5.0, -4.9, -4.8, ..., 4.8, 4.9, 5.0 Negative values of BETA indicate observation times before BETA = 0. Each successfully binned measurement at (BETA,TARGET) was assigned an ELEMENT number, starting from 1. The maximum number of points assigned at any (BETA,TARGET) was 42. Hence, the dimensions of PWRR and PWRL are 101x72x42. Unused ELEMENT positions are padded with zeros. This table tells how many of the points at each (BETA,TARGET) are valid. The number applies to both PWRR and PWRL. The table consists of two columns. The first column is an index for BETA. The second column (containing 72 items) gives the number of valid measurements at each of the targets. Columns and items are delimited by commas. Each row in the table is delimited by an ASCII carriage-return line-feed pair. Carriage-Return Line-Feed 1 1 258 BETA INDEX 1 1 ASCII_Integer 3 The BETA index for three-dimensional arrays of sorted scattered power. The index increases from 1 to 101 as the bistatic angle BETA increases from -5.0 to +5.0 in steps of 0.1 degree. 1 63 2 0 The number of valid points at location (BETA,TARGET) in arrays stored in files SRTPWRL.TAB and SRTPWRR.TAB. For example, if the value at (BETA_INDEX=3,ITEM=TARGET=5) in this array is 11, then the first 11 values at (3,5) in SRTPWRR.TAB are valid and the first 11 values at (3,5) in SRTPWRL.TAB are valid (the remaining 31 entries should be set to 0.00). 5 252 NUMBER OF VALID POINTS 1 1 ASCII_Integer 3 [UNUSED] 2 4 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. srtnpwr.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed