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radiosonde_auto_rx/rs41
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Michael Allan Wheeler 0f54d6da86 Updated for RS41 - needs testing with real radiosonde 2017-12-09 21:11:53 +11:00
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wav
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README.md rs41: readme 2017-05-04 17:14:08 +02:00
rs41.c RS41: multiple aux data 2017-01-18 22:31:49 +01:00
rs41.txt ecc: ka9q/Berlekamp-Massey <-> extEuclideanAlg 2017-10-30 16:08:57 +01:00
rs41ecc.c Updated for RS41 - needs testing with real radiosonde 2017-12-09 21:11:53 +11:00
rs41ptu.c rs41: frame <-> noise detect 2017-11-29 11:50:57 +01:00
rs41sg.c
…
rs41snr.c rs41: framelen an SNR erkennen 2017-04-18 09:58:56 +02:00

README.md

Radiosonde RS41

Files

  • rs41ecc.c, RS/ecc/bch_ecc.c

Compile

(copy bch_ecc.c)
gcc rs41ecc.c -lm -o rs41ecc

Usage

./rs41ecc [options] <audio.wav>

  • <audio.wav>: FM-demodulated signal, recorded as wav audio file
  • options:
    -i: invert signal/polarity
    -b: alternative demod
    -r: output raw data
    -v, -vx, -vv: additional data/aux/info
    --ecc: Reed-Solomon error correction
    --crc: CRC blocks: 0-OK, 1-NO
    --sat: additional Sat data

./rs41gps -h: list more options

Examples

FSK-demodulation is kept very simple. If the signal quality is low and (default) zero-crossing-demod is used, a lowpass filter is recommended:

  • sox 20170116_12Z.wav -t wav - lowpass 2800 2>/dev/null | ./rs41ecc --ecc --crc -vx

If timing/sync is not an issue, integrating the bit-samples (option -b) is better for error correction:

  • ./rs41ecc -b --ecc --crc -vx 20170116_12Z.wav

If the signal is inverted (depends on sdr-software and/or audio-card/settings), try option -i.

(cf. /RS/rs92)