PDS_VERSION_ID = PDS3 RECORD_TYPE = UNDEFINED /* RDR Identification */ DATA_SET_ID = "MRO-M-SHARAD-4-RDR-V1.0" PRODUCT_ID = "R_1237101_001_SS19_700_A_B" SOURCE_PRODUCT_ID = "R_1237101_001_SS19_700_A" PRODUCT_TYPE = BROWSE INSTRUMENT_HOST_ID = MRO INSTRUMENT_ID = SHARAD INSTRUMENT_NAME = "SHALLOW RADAR" TARGET_NAME = MARS ORBIT_NUMBER = 12371 MRO:START_SUB_SPACECRAFT_LONGITUDE = 186.050574 MRO:START_SUB_SPACECRAFT_LATITUDE = 59.746865 MRO:STOP_SUB_SPACECRAFT_LONGITUDE = 180.795870 MRO:STOP_SUB_SPACECRAFT_LATITUDE = 29.770690 START_TIME = 2009-03-17T11:40:10.336 STOP_TIME = 2009-03-17T11:49:39.347 SPACECRAFT_CLOCK_START_COUNT = "2/921757210.22039" SPACECRAFT_CLOCK_STOP_COUNT = "2/921757779.22751" PRODUCT_CREATION_TIME = 2009-11-13T11:15:42.735 SOFTWARE_NAME = "RDR2SAN.PRO" SOFTWARE_VERSION_ID = "1.7 " /* These parameters describe the browse image as a PDS document. */ ^JPEG_DOCUMENT = "R_1237101_001_SS19_700_A_B.JPG" OBJECT = JPEG_DOCUMENT DOCUMENT_NAME = "R_1237101_001_SS19_700_A_B" PUBLICATION_DATE = 2009-11-13 DOCUMENT_TOPIC_TYPE = "N/A" INTERCHANGE_FORMAT = BINARY DOCUMENT_FORMAT = "JPG" DESCRIPTION = " A JPEG format browse image based on a SHARAD RDR data product. The following parameters are parsed from each RDR frame. RDR Field Variable(s) ----------------- ------------------ RANGE_SHIFT sft ECHO_SAMPLES_REAL re ECHO_SAMPLES_IMAGINARY im SUB_SC_EAST_LONGITUDE slon (orbit start) elon (orbit end) SUB_SC_PLANETOCENTRIC_LATITUDE slat(orbit start) elat (orbit end) The real and imaginary parts of the signal are then joined via a traditional log-scale transform: sig = 10 * log10 (re^2 + im^2) The sig is sorted numerically and the mean value for the lowest 100 sig values is added to a running average noise value. The mean noise is subtracted from each pixel value, transforming the 'sig' variable into 'san', or 'signal above noise.' san = 10*log10(10.^(0.1*sig)-10^(0.1*noise)); The san values are scaled so the pixel brightness values correspond linearly to an absolute range of 0 to 40 decibels. Finally, the radargram is shifted to adjust for the RANGE_SHIFT value." END_OBJECT = JPEG_DOCUMENT END