search

lofaldli / gr-ccsds

GNU Radio module for Reed Solomon coded CCSDS frames
40 stars 29 forks source link

RS interleave sequence not correct ? #8

Closed warmonkey closed 3 years ago

warmonkey commented 5 years ago

https://deepspace.jpl.nasa.gov/dsndocs/810-005/208/208B.pdf see page 24, rs decode output should "re-interleaved" to restore original order.

lofaldli commented 5 years ago

i'm not sure i understand what you mean, isn't this what is done in decode_frame (line 165)?

https://github.com/lofaldli/gr-ccsds/blob/e13cab4177ae4fef521a1347f04e46b53249a35c/lib/ccsds_decoder_impl.cc#L159-L182

warmonkey commented 5 years ago

input sequence, interleave = 8 00 01 02 03 04 05 ff 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f ......(total 223 8) ......(parity 32 8) corrected 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f ...... rs decoder input decoder 0 - 00 08 10 18 ...... decoder 6 - ff 0e 16 1e ...... ....