Gamma MSP: Reference Manual

JERS_fix

ANSI-C program: JERS_fix.c

NAME
JERS_fix - Concatenation and line adjustment of JERS SAR raw data files

SYNOPSIS
JERS_fix <SAR_param> <PROC_param> <raw_in_1> <raw_in_2> <...> <raw_out>

EXAMPLE
JERS_fix JERS-1.par p961123.slc.par 961123_row205.raw 961123_row206.raw 961123_row207.raw 961123_row205-207.fix

DESCRIPTION
JERS_fix reads and concatenates one or several consecutive JERS raw data files, range adjusts the lines and writes out the concatenated ("fixed") raw data file. The concatenation of raw data files allows SAR processing of longer strips. The overlap between the input raw data files is determined from the raw data. Range shifts within one or several of the individual input raw data files are considered as calculated from the raw data line header. The program does not scan the data for missing data lines (we are not aware of JERS raw data with missing lines).

The concatenated output raw data file consists of the header line of the first input raw data file, followed by the raw data records. The sizes of the headerline (usually 720 bytes), and the data records (12700 bytes) are specified in the SAR sensor parameter file. Each data record consists of a line header (412 bytes) and raw data (12288 bytes, zero padded if a shifted during the adjustment).

Notice that sometimes JERS raw data without header line is provided. Displaying a section of the JERS raw data file using the MSP program disbyte, prior to the interpretation is therefore recommended. Adjustment of the file header size parameter in the sensor parameter file (720 -> 0) allows to process the raw data with zero file header size. The file header size needs to be the same for all input raw data files. JERS_fix updates the near slant range value in the processing parameter file based on the information extracted from the raw data line header.

OPTIONS
If a new MSP processing parameter file name is provided JERS_fix creates a processing parameter file introducing the information available from the raw data line headers. Notice that this information is not sufficient for SAR processing. In particular state vectors and the raw data starting time need to be added.

SEE ALSO
Users Guide, disbyte, typedef_MSP.h.