urn:nasa:pds:clementine1_bistatic:sort:ratiofn 1.0 1.21.0.0 Product_Observational 2000 This file contains empirical scattering functions derived from sorted RCP and LCP echoes obtained during Revolution 233 (also known as Orbit 234) of the Clementine bistatic radar experiment. Sorting was accomplished by identifying 72 'target' points on the lunar surface for which the instantaneous bistatic angle (BETA) was zero. The targets were separated by one second in time and covered the last 72 seconds when such points could be defined on the surface. The last point (TARGET=72) satisfied BETA=0 at 1994-04-09T18:46:43 Earth Receive Time (ERT), 6.5 seconds after the BETA=0 point passed closest to the South Pole. RCP and LCP echo powers were sorted according to their target number and according to the bistatic angle BETA at the target point when the measurement was made. The target number (TARGET) was based on the frequency of the measured value relative to a hypothetical echo from the South Pole. If the frequency of one of the 72 targets matched the frequency of the measurement, its number was assigned to the measurement and the bistatic angle (BETA) at the target at the measurement time became the second sorting index. Sorting according to BETA was limited to 101 bins with center values -5.0, -4.9, ..., +5.0. Measurements for which no target could be matched or for which ABS(BETA) was larger than 5 were discarded. Since sorting depended only on geometry, the same (TARGET,BETA) assignment applied to both RCP and LCP values. Inputs to the sorting procedure were 1464 1024-point power spectra in RCP and LCP (files RCP.IMG and LCP.IMG, respectively, in this archive). The sorted output files are SRTPWRR.TAB and SRTPWRL.TAB; the table giving the number of points at each (BETA,TARGET) is SRTNPWR.TAB. The values were radiometrically calibrated to units of watts/Hz in both channels; but no attempt was made to adjust the calibrated values for variable antenna gain, scattering function, or surface area at each frequency or as a function of location on the surface. Column 1 in this table gives the steps into which BETA values were sorted (-5 to +5 in increments of 0.1 degrees). Negative BETA values denote measurements prior to BETA=0 at the target. Column 2 gives the ratio of the average RCP value to the average LCP value for 13 targets poleward of about 88 S latitude (targets 58-70). Column 3 gives the median of individual RCP/LCP ratios for the same 13 targets. 2024-04-26 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 ratiofn.tab 1998-12-28T02:19:00 TABLE 0 101 Each row comprises three columns -- ASCII real numbers, delimited by commas. The columns and their delimiters occupy 30 bytes. Each row ends with an ASCII carriage-return line-feed pair in positions 31 and 32. Carriage-Return Line-Feed 3 0 32 BETA 1 1 ASCII_Real 10 degree Bistatic angle at the target point when the RCP and LCP measurements were made. The center value of a bin into which measurements were sorted based on bistatic angle at the target point at the time of the measurements. Bins were 0.1 degrees wide. RATIO: AVERAGE RCP TO AVERAGE LCP 2 12 ASCII_Real 9 Ratio of the average RCP measurement to the average LCP measurement at each BETA for targets 58-70. MEDIAN OF INDIVIDUAL RCP/LCP VALUES 3 22 ASCII_Real 9 Median of individual RCP/LCP values at each BETA for targets 58-70. ratiofn.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed