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UNPRIVTOI4

Section: Misc. Reference Manual Pages (1L)
Updated: 2 April 1991
Index Return to Main Contents

NAME

unpriVtoi4 - filter to unpack ri data to int*4 (ao)

SYNOPSIS

unpriVtoi4 [ -b bits ] [ -i numInputFifos ] [ -f fifoToOutput ] [ -d dataFormat ]

DESCRIPTION

unpriVtoi4 is a program to unpack a single channel of RADAR INTERFACE (RI) binary data to ieee integer*4 format. The input is taken from the standard input (pipe or disc file). The header portion of each record should have been removed (see stripVme(1L)). The output data is integer*4 format and is written to standard out.

The radar interface has 2 channels of 2 digitizers each. The digitizers can pack the data to 1,2,4,8, or 12 bits. You specify the number of bits the data has been packed to with the -b option. The -i option specifies how many channels were recorded in the input file (default 1). If two channels were recorded than the -f option specifies which channel to output (1 or 2). A single digitizer of a channel can be output using -d i or q (i and q are the two digitizers in a single channel).

Let In be the n'th sample from the I digitizer and Qn be the n'th sample from the Q digitizer. For 4 bit packing the input would look like: Q4Q3Q2Q1I4I3I2I1 and the output would be: I1,Q1,I2,Q2,I3,Q3,I4,Q4.....

OPTIONS

-b: bits The number of bits the data has been packed to. It can be 1,2,4,8, or 12. The default is 12 bits.
-d: digitizer Use only one of the two digitizers. The value can be i for the I digitizer or q for the Q digitizer.
-i: numFifos 1 or 2 to specify the number of channels in the input data. The default is 1 fifo.
-f: fifoToOutput If the input data has two channels then this specifies which of the two to output (1 or 2). The default is channel 1.

EXAMPLES

Unpack 1 file from a data tape. Assume it is 4 bit packed data and has one set of I,Q samplers. The output order will be : I1,Q1,I2,Q2,I3,Q3.... Output the data to junk.out.

: dd if=/dev/nrst12 bs=64k|stripVme -h|unpriVtoi4 -b 4 > junk.out

Unpack 1 file from disc. Assume it is two bit data with one set of I,Q samplers. Only keep the I digitizer data. Write the data to junk.out. The output order will be: I1,I2,I3,I4....

: stripVme -h < input.dat|unpriVtoi4 -b 2 -d i > junk.out

Unpack 1 file from tape. Assume it is 8 bit data and has 2 channels of I,Q digtizers (QA1,IA1,QB1,IB1). Keep channel A. The input order is QA2QA1IA2IA1,QB2QB1IB2IB1,.... The output order will be: IA1,QA1,IA2,QA2,... Write the output to junk.out.

: dd if=/dev/nrst12 bs=64k|stripVme -h|unpriVtoi4 -b 8 -i 2 -f 1 > junk.out

FILES

~phil/util/filters/unpriVtoi4.c location of source code

BUGS

You must tell the program the correct bit packing, number of channels, etc.. If not, you get basura.

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