radiosonde_auto_rx/rs41/rs41sg.c

586 wiersze
14 KiB
C

/*
* radiosonde RS41-SG
* author: zilog80
* usage:
* gcc rs41sg.c -lm -o rs41sg
* ./rs41sg [options] rs41_audio.wav
* options:
* -v, --verbose
* -r, --raw
* ./rs41sg rs41_audio.wav
* ./rs41sg -r rs41_audio.wav | less -S
* ./rs41sg -v rs41_audio.wav 1> /dev/null
* ./rs41sg -v rs41_audio.wav 1> pos.txt
* ./rs41sg -v rs41_audio.wav 2> cal.txt
* ./rs41sg -v rs41_audio.wav 2>&1 >/dev/null | grep 0x00
*/
#include <stdio.h>
#include <string.h>
#include <math.h>
typedef unsigned char ui8_t;
typedef struct {
int frnr;
char id[9];
int week; int gpssec;
int jahr; int monat; int tag;
int wday;
int std; int min; int sek;
double lat; double lon; double h;
} gpx_t;
gpx_t gpx;
int option_verbose = 0, // ausfuehrliche Anzeige
option_raw = 0, // rohe Frames
wavloaded = 0;
#define HEADOFS 24 // HEADOFS+HEADLEN <= 64
#define HEADLEN 32 // HEADOFS+HEADLEN mod 8 = 0
#define FRAMESTART ((HEADOFS+HEADLEN)/8)
/* 10 B6 CA 11 22 96 12 F8 */
char header[] = "0000100001101101010100111000100001000100011010010100100000011111";
char buf[HEADLEN+1] = "x";
int bufpos = -1;
#define FRAME_LEN 320
ui8_t frame[FRAME_LEN] = { 0x10, 0xB6, 0xCA, 0x11, 0x22, 0x96, 0x12, 0xF8};
#define MASK_LEN 64
ui8_t mask[MASK_LEN] = { 0x96, 0x83, 0x3E, 0x51, 0xB1, 0x49, 0x08, 0x98,
0x32, 0x05, 0x59, 0x0E, 0xF9, 0x44, 0xC6, 0x26,
0x21, 0x60, 0xC2, 0xEA, 0x79, 0x5D, 0x6D, 0xA1,
0x54, 0x69, 0x47, 0x0C, 0xDC, 0xE8, 0x5C, 0xF1,
0xF7, 0x76, 0x82, 0x7F, 0x07, 0x99, 0xA2, 0x2C,
0x93, 0x7C, 0x30, 0x63, 0xF5, 0x10, 0x2E, 0x61,
0xD0, 0xBC, 0xB4, 0xB6, 0x06, 0xAA, 0xF4, 0x23,
0x78, 0x6E, 0x3B, 0xAE, 0xBF, 0x7B, 0x4C, 0xC1};
/* LFSR: ab i=8 (mod 64):
* m[16+i] = m[i] ^ m[i+2] ^ m[i+4] ^ m[i+6]
* ________________3205590EF944C6262160C2EA795D6DA15469470CDCE85CF1
* F776827F0799A22C937C3063F5102E61D0BCB4B606AAF423786E3BAEBF7B4CC196833E51B1490898
*/
/* ------------------------------------------------------------------------------------ */
#define BAUD_RATE 4800
int sample_rate = 0, bits_sample = 0, channels = 0;
float samples_per_bit = 0;
int findstr(char *buff, char *str, long pos) {
int i;
for (i = 0; i < 4; i++) {
if (buff[(pos+i)%4] != str[i]) break;
}
return i;
}
int read_wav_header(FILE *fp) {
char txt[5] = "\0\0\0\0";
char buff[4];
int byte, num, i;
long p = 0, pos_fmt, pos_dat;
char fmt_[5] = "fmt ";
char data[5] = "data";
if (fseek(fp, 0L, SEEK_SET)) return -1;
if (fread(txt, 1, 4, fp) < 4) return -1;
if (strncmp(txt, "RIFF", 4)) return -1;
if (fseek(fp, 8L, SEEK_SET)) return -1;
if (fread(txt, 1, 4, fp) < 4) return -1;
if (strncmp(txt, "WAVE", 4)) return -1;
// pos_fmt = 12L
for ( ; ; ) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
buff[p % 4] = byte;
p++;
if (findstr(buff, fmt_, p) == 4) break;
}
pos_fmt = ftell(fp)-4; //fprintf(stderr, "pos_fmt %ld\n", pos_fmt);
if (fseek(fp, pos_fmt+10, SEEK_SET)) return -1;
num = 0;
for (i = 0; i < 2; i++) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
num |= (byte << (8*i));
}
channels = num;
// if (fseek(fp, pos_fmt+12L, SEEK_SET)) return -1; // 24L
num = 0;
for (i = 0; i < 4; i++) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
num |= (byte << (8*i));
}
sample_rate = num;
if (fseek(fp, pos_fmt+22, SEEK_SET)) return -1; // 34L
num = 0;
for (i = 0; i < 2; i++) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
num |= (byte << (8*i));
}
bits_sample = num;
// pos_dat = 36L
for ( ; ; ) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
buff[p % 4] = byte;
p++;
if (findstr(buff, data, p) == 4) break;
}
pos_dat = ftell(fp)-4; //fprintf(stderr, "pos_dat %ld\n", pos_dat);
/*
if (fseek(fp, 36L, SEEK_SET)) return -1;
if (fread(txt, 1, 4, fp) < 4) return -1;
if (strncmp(txt, "data", 4)) return -1;
*/
if (fseek(fp, pos_dat+8, SEEK_SET)) return -1; // 44L
fprintf(stderr, "sample_rate: %d\n", sample_rate);
fprintf(stderr, "bits : %d\n", bits_sample);
fprintf(stderr, "channels : %d\n", channels);
if ((bits_sample != 8) && (bits_sample != 16)) return -1;
samples_per_bit = sample_rate/(float)BAUD_RATE;
fprintf(stderr, "samples/bit: %.2f\n", samples_per_bit);
return 0;
}
int read_sample(FILE *fp) { // int = i32_t
int byte, i, ret; // return ui16_t/ui8_t oder EOF
for (i = 0; i < channels; i++) {
// i = 0: links bzw. mono
byte = fgetc(fp);
if (byte == EOF) return EOF;
if (i == 0) ret = byte;
if (bits_sample == 16) {
byte = fgetc(fp);
if (byte == EOF) return EOF;
if (i == 0) ret += byte << 8;
}
}
// unsigned 8/16 bit sample >= 0
return ret; // EOF < 0
}
int sign(int sample) {
int sgn = 0;
if (bits_sample == 8) { // unsigned char:
if (sample & 0x80) sgn = 1; else sgn = -1; // 00..7F - , 80..FF: +
}
else if (bits_sample == 16) {
if (sample & 0x8000) sgn = -1; else sgn = 1;
}
return sgn;
}
int par=1, par_alt=1;
unsigned long sample_count = 0;
int read_bits_fsk(FILE *fp, int *bit, int *len) {
int n, sample;
float l;
n = 0;
do{
sample = read_sample(fp); // unsigned sample;
if (sample == EOF) return EOF; // usample >= 0
par_alt = par;
par = sign(sample);
sample_count++;
n++;
} while (par*par_alt > 0);
l = (float)n / samples_per_bit; // abw = n % samples_per_bit;
*len = (int)(l+0.5);
*bit = (1-par_alt)/2; // unten 1, oben -1
// inverse: *bit = (1+par_alt)/2;
/* Y-offset ? */
return 0;
}
/* ------------------------------------------------------------------------------------ */
int bits2byte(char bits[]) {
int i, byteval=0, d=1;
for (i = 0; i < 8; i++) { // little endian
/* for (i = 7; i >= 0; i--) { // big endian */
if (bits[i] == 1) byteval += d;
else if (bits[i] == 0) byteval += 0;
else return 0x100;
d <<= 1;
}
return byteval;
}
void inc_bufpos() {
bufpos = (bufpos+1) % HEADLEN;
}
int compare() {
int i=0, j = bufpos;
while (i < HEADLEN) {
if (j < 0) j = HEADLEN-1;
if (buf[j] != header[HEADLEN+HEADOFS-1-i]) break;
j--;
i++;
}
return i;
}
ui8_t xorbyte(int pos) {
return frame[pos] ^ mask[pos % MASK_LEN];
}
/* ------------------------------------------------------------------------------------ */
/*
* Convert GPS Week and Seconds to Modified Julian Day.
* - Adapted from sci.astro FAQ.
* - Ignores UTC leap seconds.
*/
void Gps2Date(long GpsWeek, long GpsSeconds, int *Year, int *Month, int *Day) {
long GpsDays, Mjd;
long J, C, Y, M;
GpsDays = GpsWeek * 7 + (GpsSeconds / 86400);
Mjd = 44244 + GpsDays;
J = Mjd + 2468570;
C = 4 * J / 146097;
J = J - (146097 * C + 3) / 4;
Y = 4000 * (J + 1) / 1461001;
J = J - 1461 * Y / 4 + 31;
M = 80 * J / 2447;
*Day = J - 2447 * M / 80;
J = M / 11;
*Month = M + 2 - (12 * J);
*Year = 100 * (C - 49) + Y + J;
}
/* ------------------------------------------------------------------------------------ */
#define pos_FrameNb 0x03B // 2 byte
#define pos_SondeID 0x03D // 8 byte
#define pos_CalData 0x052 // 1 byte, counter 0x00..0x32
#define pos_GPSweek 0x095 // 2 byte
#define pos_GPSTOW 0x097 // 4 byte
#define pos_GPSecefX 0x114 // 4 byte
#define pos_GPSecefY 0x118 // 4 byte
#define pos_GPSecefZ 0x11C // 4 byte
int get_FrameNb() {
int i;
unsigned byte;
ui8_t frnr_bytes[2];
int frnr;
for (i = 0; i < 2; i++) {
byte = xorbyte(pos_FrameNb + i);
frnr_bytes[i] = byte;
}
frnr = frnr_bytes[0] + (frnr_bytes[1] << 8);
gpx.frnr = frnr;
return 0;
}
int get_SondeID() {
int i;
unsigned byte;
ui8_t sondeid_bytes[8];
for (i = 0; i < 8; i++) {
byte = xorbyte(pos_SondeID + i);
if ((byte < 0x20) || (byte > 0x7E)) return -1;
sondeid_bytes[i] = byte;
}
for (i = 0; i < 8; i++) {
gpx.id[i] = sondeid_bytes[i];
}
gpx.id[9] = '\0';
return 0;
}
int get_GPSweek() {
int i;
unsigned byte;
ui8_t gpsweek_bytes[2];
int gpsweek;
for (i = 0; i < 2; i++) {
byte = xorbyte(pos_GPSweek + i);
gpsweek_bytes[i] = byte;
}
gpsweek = gpsweek_bytes[0] + (gpsweek_bytes[1] << 8);
gpx.week = gpsweek;
return 0;
}
char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"};
int get_GPStime() {
int i;
unsigned byte;
ui8_t gpstime_bytes[4];
int gpstime = 0, // 32bit
day;
for (i = 0; i < 4; i++) {
byte = xorbyte(pos_GPSTOW + i);
gpstime_bytes[i] = byte;
}
memcpy(&gpstime, gpstime_bytes, 4);
//ms = gpstime % 1000;
gpstime /= 1000;
gpx.gpssec = gpstime;
day = gpstime / (24 * 3600);
gpstime %= (24*3600);
if ((day < 0) || (day > 6)) return -1;
gpx.wday = day;
gpx.std = gpstime / 3600;
gpx.min = (gpstime % 3600) / 60;
gpx.sek = gpstime % 60;
return 0;
}
void ecef2elli(double X[], double *lat, double *lon, double *h) {
double a = 6378137.0,
b = 6356752.31424518,
e, ee;
double phi, lam, R, p, t;
e = sqrt( (a*a - b*b) / (a*a) );
ee = sqrt( (a*a - b*b) / (b*b) );
lam = atan2( X[1] , X[0] );
p = sqrt( X[0]*X[0] + X[1]*X[1] );
t = atan2( X[2]*a , p*b );
phi = atan2( X[2] + ee*ee * b * sin(t)*sin(t)*sin(t) ,
p - e*e * a * cos(t)*cos(t)*cos(t) );
R = a / sqrt( 1 - e*e*sin(phi)*sin(phi) );
*h = p / cos(phi) - R;
*lat = phi*180/M_PI;
*lon = lam*180/M_PI;
}
int get_GPSkoord() {
int i, k;
unsigned byte;
ui8_t XYZ_bytes[4];
int XYZ; // 32bit
double X[3], lat, lon, h;
for (k = 0; k < 3; k++) {
for (i = 0; i < 4; i++) {
byte = xorbyte(pos_GPSecefX + 4*k + i);
XYZ_bytes[i] = byte;
}
memcpy(&XYZ, XYZ_bytes, 4);
X[k] = XYZ / 100.0;
}
ecef2elli(X, &lat, &lon, &h);
gpx.lat = lat;
gpx.lon = lon;
gpx.h = h;
return 0;
}
int get_Cal() {
int i;
unsigned byte;
ui8_t calfr;
byte = xorbyte(pos_CalData);
calfr = byte;
fprintf(stderr, " 0x%02x:", calfr);
for (i = 0; i < 16; i++) {
byte = xorbyte(pos_CalData+1+i);
fprintf(stderr, " %02x", byte);
}
fprintf(stderr, "\n");
return 0;
}
/* ------------------------------------------------------------------------------------ */
int print_position() {
int err;
err = 0;
err |= get_FrameNb();
err |= get_SondeID();
err |= get_GPSweek();
err |= get_GPStime();
err |= get_GPSkoord();
if (!err) {
Gps2Date(gpx.week, gpx.gpssec, &gpx.jahr, &gpx.monat, &gpx.tag);
fprintf(stdout, "[%5d] ", gpx.frnr);
if (option_verbose) fprintf(stdout, "(%s) ", gpx.id);
fprintf(stdout, "%s ", weekday[gpx.wday]);
fprintf(stdout, "%04d-%02d-%02d %02d:%02d:%02d",
gpx.jahr, gpx.monat, gpx.tag, gpx.std, gpx.min, gpx.sek);
if (option_verbose) fprintf(stdout, " (W %d)", gpx.week);
fprintf(stdout, " ");
fprintf(stdout, " lat: %.5f ", gpx.lat);
fprintf(stdout, " lon: %.5f ", gpx.lon);
fprintf(stdout, " h: %.2f ", gpx.h);
if (option_verbose) get_Cal();
fprintf(stdout, "\n");
}
return err;
}
void print_frame(int len) {
int i;
ui8_t byte;
if (option_raw) {
for (i = 0; i < len; i++) {
//byte = frame[i];
byte = xorbyte(i);
fprintf(stdout, "%02x", byte);
}
fprintf(stdout, "\n");
}
else print_position();
}
int main(int argc, char *argv[]) {
FILE *fp;
char bitbuf[8];
int bit_count = 0,
byte_count = FRAMESTART,
header_found = 0,
byte, i;
int bit, len;
++argv;
while ((*argv) && (!wavloaded)) {
if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
option_verbose = 1;
}
else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
option_raw = 1;
}
else {
if ( !(fp = fopen(*argv, "rb")) ) {
fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv);
return -1;
}
else wavloaded = 1;
}
++argv;
}
if (!wavloaded) {
fprintf(stderr, "rs41sg [options] <rs41_audio.wav>\n");
fprintf(stderr, " options:\n");
fprintf(stderr, " -v, --verbose\n");
fprintf(stderr, " -r, --raw\n");
return -1;
}
i = read_wav_header(fp);
if (i) {
fclose(fp);
return -1;
}
while (!read_bits_fsk(fp, &bit, &len)) {
if (len == 0) { // reset_frame();
if (byte_count > FRAME_LEN-20) print_frame(byte_count);
bit_count = 0;
byte_count = FRAMESTART;
header_found = 0;
inc_bufpos();
buf[bufpos] = 'x';
continue; // ...
}
for (i = 0; i < len; i++) {
inc_bufpos();
buf[bufpos] = 0x30 + bit; // Ascii
if (!header_found) {
if (compare() >= HEADLEN) header_found = 1;
}
else {
bitbuf[bit_count] = bit;
bit_count++;
if (bit_count == 8) {
bit_count = 0;
byte = bits2byte(bitbuf);
frame[byte_count] = byte;
byte_count++;
if (byte_count == FRAME_LEN) {
byte_count = FRAMESTART;
header_found = 0;
print_frame(FRAME_LEN);
}
}
}
}
}
fclose(fp);
return 0;
}