RS-tracker

Historia

rs1729 ffa21731ff lmsX: short frames		2019-02-28 13:04:33 +01:00
..
README.md	README update	2018-09-22 12:48:40 +02:00
lms6.c	…
lms6.txt	lms6: nrz-ambiguity	2018-09-17 20:05:03 +02:00
lms6ccsds.c	lms6: viterbi update	2018-09-20 23:42:56 +02:00
lms6ecc.c	…
lmsX2446.c	lmsX: short frames	2019-02-28 13:04:33 +01:00

README.md

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