Radiosonde LMS6

LMS6 (403 MHz)
(for 1680 MHz 9600 bit/s try /RS/mk2a)

FSK 4800 bit/s
R=1/2 K=7 convolutional code, Reed-Solomon RS(255,223)-blocks (CCSDS)

Files

• lms6ccsds.c, RS/ecc/bch_ecc.c

Compile

(copy bch_ecc.c)
gcc lms6ccsds.c -lm -o lms6ccsds

Usage

./lms6ccsds -b -v --vit --ecc <audio.wav>

• <audio.wav>: FM-demodulated signal, recorded as wav audio file
• options:
  -b: integrate bit-samples
  -r: output raw data
  -v: additional data (sonde-ID)
  --vit: Viterbi decode
  --ecc: Reed-Solomon error correction
  

Integrating bit-samples is better for error correction. Good synchronization is important. Correlation locates block/frame start even better (cf. /RS/demod).

older versions

• lms6.c, lms6ecc.c