radiosonde_auto_rx/lms6/lms6.c

654 wiersze
16 KiB
C

/*
LMS6
(403 MHz)
*/
#include <stdio.h>
#include <string.h>
#include <math.h>
typedef unsigned char ui8_t;
typedef unsigned short ui16_t;
typedef unsigned int ui32_t;
int option_verbose = 0, // ausfuehrliche Anzeige
option_raw = 0, // rohe Frames
option_inv = 0, // invertiert Signal
option_res = 0, // genauere Bitmessung
wavloaded = 0;
/* -------------------------------------------------------------------------- */
#define BAUD_RATE 4800
int sample_rate = 0, bits_sample = 0, channels = 0;
float samples_per_bit = 0;
int findstr(char *buf, char *str, int pos) {
int i;
for (i = 0; i < 4; i++) {
if (buf[(pos+i)%4] != str[i]) break;
}
return i;
}
int read_wav_header(FILE *fp) {
char txt[4+1] = "\0\0\0\0";
unsigned char dat[4];
int byte, p=0;
if (fread(txt, 1, 4, fp) < 4) return -1;
if (strncmp(txt, "RIFF", 4)) return -1;
if (fread(txt, 1, 4, fp) < 4) return -1;
// pos_WAVE = 8L
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;
txt[p % 4] = byte;
p++; if (p==4) p=0;
if (findstr(txt, "fmt ", p) == 4) break;
}
if (fread(dat, 1, 4, fp) < 4) return -1;
if (fread(dat, 1, 2, fp) < 2) return -1;
if (fread(dat, 1, 2, fp) < 2) return -1;
channels = dat[0] + (dat[1] << 8);
if (fread(dat, 1, 4, fp) < 4) return -1;
memcpy(&sample_rate, dat, 4); //sample_rate = dat[0]|(dat[1]<<8)|(dat[2]<<16)|(dat[3]<<24);
if (fread(dat, 1, 4, fp) < 4) return -1;
if (fread(dat, 1, 2, fp) < 2) return -1;
//byte = dat[0] + (dat[1] << 8);
if (fread(dat, 1, 2, fp) < 2) return -1;
bits_sample = dat[0] + (dat[1] << 8);
// pos_dat = 36L + info
for ( ; ; ) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
txt[p % 4] = byte;
p++; if (p==4) p=0;
if (findstr(txt, "data", p) == 4) break;
}
if (fread(dat, 1, 4, fp) < 4) return -1;
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;
}
#define EOF_INT 0x1000000
int read_signed_sample(FILE *fp) { // int = i32_t
int byte, i, ret; // EOF -> 0x1000000
for (i = 0; i < channels; i++) {
// i = 0: links bzw. mono
byte = fgetc(fp);
if (byte == EOF) return EOF_INT;
if (i == 0) ret = byte;
if (bits_sample == 16) {
byte = fgetc(fp);
if (byte == EOF) return EOF_INT;
if (i == 0) ret += byte << 8;
}
}
if (bits_sample == 8) return ret-128; // 8bit: 00..FF, centerpoint 0x80=128
if (bits_sample == 16) return (short)ret;
return ret;
}
int par=1, par_alt=1;
unsigned long sample_count = 0;
int read_bits_fsk(FILE *fp, int *bit, int *len) {
static int sample;
int n, y0;
float l, x1;
static float x0;
n = 0;
do{
y0 = sample;
sample = read_signed_sample(fp);
if (sample == EOF_INT) return EOF;
sample_count++;
par_alt = par;
par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
n++;
} while (par*par_alt > 0);
if (!option_res) l = (float)n / samples_per_bit;
else { // genauere Bitlaengen-Messung
x1 = sample/(float)(sample-y0); // hilft bei niedriger sample rate
l = (n+x0-x1) / samples_per_bit; // meist mehr frames (nicht immer)
x0 = x1;
}
*len = (int)(l+0.5);
if (!option_inv) *bit = (1+par_alt)/2; // oben 1, unten -1
else *bit = (1-par_alt)/2; // sdr#<rev1381?, invers: unten 1, oben -1
// *bit = (1+inv*par_alt)/2; // ausser inv=0
return 0;
}
/* -------------------------------------------------------------------------- */
#define BITS 8
#define HEADLEN (3*16)
#define HEADOFS 0
// (pp pp 24 54) 00 00 00 (7A..: SondeID, GPS, ...)
char header[] = "0011101100100000""0000000000000000""0000000000000000";//"0010010011110001";
#define FRAMESTART 0
#define FRAME_LEN (300) // 4800baud, 16bits/byte
#define BITFRAME_LEN (FRAME_LEN*BITS)
#define RAWBITFRAME_LEN (BITFRAME_LEN*2)
char buf[HEADLEN];
int bufpos = -1;
char frame_rawbits[RAWBITFRAME_LEN+8];
#define K 8
char polyA[] = "10010101"; // 0xA9
char polyB[] = "00100010"; // 0x44
char frame_bits[BITFRAME_LEN+K+4]; // init K-1 bits mit 0
ui8_t frame_bytes[FRAME_LEN]; // = { 0x7A, ... };
void inc_bufpos() {
bufpos = (bufpos+1) % HEADLEN;
}
char cb_inv(char c) {
if (c == '0') return '1';
if (c == '1') return '0';
return c;
}
int compare2() {
int i, j;
i = 0;
j = bufpos;
while (i < HEADLEN) {
if (j < 0) j = HEADLEN-1;
if (buf[j] != header[HEADOFS+HEADLEN-1-i]) break;
j--;
i++;
}
if (i == HEADLEN) return 1;
i = 0;
j = bufpos;
while (i < HEADLEN) {
if (j < 0) j = HEADLEN-1;
if (buf[j] != cb_inv(header[HEADOFS+HEADLEN-1-i])) break;
j--;
i++;
}
if (i == HEADLEN) return -1;
return 0;
}
int deconv(char* frame_rawbits, char *bits) {
int j, n, bitA, bitB;
char *p;
int len;
int errors = 0;
len = strlen(frame_rawbits);
for (j = 0; j < K-1; j++) bits[j] = '0';
n = 0;
while (2*n < len-2*K) {
p = frame_rawbits+2*n;
bitA = bitB = 0;
for (j = 0; j < K-1; j++) {
bitA ^= (bits[n+j]&1) & (polyA[j]&1);
bitB ^= (bits[n+j]&1) & (polyB[j]&1);
}
if ( (bitA^(p[0]&1))==(polyA[K-1]&1) && (bitB^(p[1]&1))==(polyB[K-1]&1) ) bits[n+K-1] = '1';
else if ( (bitA^(p[0]&1))==0 && (bitB^(p[1]&1))==0 ) bits[n+K-1] = '0';
else { // error: no error correction...
if ( (bitA^(p[0]&1))!=(polyA[K-1]&1) && (bitB^(p[1]&1))==(polyB[K-1]&1) ) bits[n+K-1] = 0x39;
else bits[n+K-1] = 0x38;
if (n < 256) errors++; // nur bis Ende GPS-vel; alternativ: return pos 1. error
}
n += 1;
}
bits[n+K-1] = '\0';
return errors;
}
int bits2bytes(char *bitstr, ui8_t *bytes) {
int i, bit, d, byteval;
int bitpos, bytepos;
bitpos = 0;
bytepos = 0;
while (bytepos < FRAME_LEN) {
byteval = 0;
d = 1;
for (i = 0; i < BITS; i++) {
bit=*(bitstr+bitpos+i); /* little endian */
//bit=*(bitstr+bitpos+7-i); /* big endian */
if ((bit == '1') || (bit == '9')) byteval += d;
else /*if ((bit == '0') || (bit == '8'))*/ byteval += 0;
d <<= 1;
}
bitpos += BITS;
bytes[bytepos++] = byteval & 0xFF;
}
//while (bytepos < FRAME_LEN) bytes[bytepos++] = 0;
return 0;
}
/* -------------------------------------------------------------------------- */
typedef struct {
int frnr;
int sn;
int week; int gpstow;
int jahr; int monat; int tag;
int wday;
int std; int min; float sek;
double lat; double lon; double h;
double vH; double vD; double vV;
double vE; double vN; double vU;
//int freq;
} gpx_t;
gpx_t gpx;
#define pos_SondeSN 0x00 // ?3 byte 7A....
#define pos_FrameNb 0x03 // 2 byte
//GPS Position
#define pos_GPSTOW 0x05 // 4 byte
#define pos_GPSlat 0x0D // 4 byte
#define pos_GPSlon 0x11 // 4 byte
#define pos_GPSalt 0x15 // 4 byte
//#define pos_GPSweek 0x20 // 2 byte
//GPS Velocity East-North-Up (ENU)
#define pos_GPSvO 0x19 // 3 byte
#define pos_GPSvN 0x1C // 3 byte
#define pos_GPSvV 0x1F // 3 byte
int get_SondeSN() {
unsigned byte;
byte = (frame_bytes[pos_SondeSN]<<16) | (frame_bytes[pos_SondeSN+1]<<8) | frame_bytes[pos_SondeSN+2];
gpx.sn = byte;
return 0;
}
int get_FrameNb() {
int i;
unsigned byte;
ui8_t frnr_bytes[2];
int frnr;
for (i = 0; i < 2; i++) {
byte = frame_bytes[pos_FrameNb + i];
frnr_bytes[i] = byte;
}
frnr = (frnr_bytes[0] << 8) + frnr_bytes[1] ;
gpx.frnr = frnr;
return 0;
}
char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"};
//char weekday[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
int get_GPStime() {
int i;
unsigned byte;
ui8_t gpstime_bytes[4];
int gpstime = 0, // 32bit
day;
float ms;
for (i = 0; i < 4; i++) {
byte = frame_bytes[pos_GPSTOW + i];
gpstime_bytes[i] = byte;
}
gpstime = 0;
for (i = 0; i < 4; i++) {
gpstime |= gpstime_bytes[i] << (8*(3-i));
}
gpx.gpstow = gpstime;
ms = gpstime % 1000;
gpstime /= 1000;
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 + ms/1000.0;
return 0;
}
double B60B60 = 0xB60B60; // 2^32/360 = 0xB60B60.xxx
int get_GPSlat() {
int i;
unsigned byte;
ui8_t gpslat_bytes[4];
int gpslat;
double lat;
for (i = 0; i < 4; i++) {
byte = frame_bytes[pos_GPSlat + i];
if (byte > 0xFF) return -1;
gpslat_bytes[i] = byte;
}
gpslat = 0;
for (i = 0; i < 4; i++) {
gpslat |= gpslat_bytes[i] << (8*(3-i));
}
lat = gpslat / B60B60;
gpx.lat = lat;
return 0;
}
int get_GPSlon() {
int i;
unsigned byte;
ui8_t gpslon_bytes[4];
int gpslon;
double lon;
for (i = 0; i < 4; i++) {
byte = frame_bytes[pos_GPSlon + i];
if (byte > 0xFF) return -1;
gpslon_bytes[i] = byte;
}
gpslon = 0;
for (i = 0; i < 4; i++) {
gpslon |= gpslon_bytes[i] << (8*(3-i));
}
lon = gpslon / B60B60;
gpx.lon = lon;
return 0;
}
int get_GPSalt() {
int i;
unsigned byte;
ui8_t gpsheight_bytes[4];
int gpsheight;
double height;
for (i = 0; i < 4; i++) {
byte = frame_bytes[pos_GPSalt + i];
if (byte > 0xFF) return -1;
gpsheight_bytes[i] = byte;
}
gpsheight = 0;
for (i = 0; i < 4; i++) {
gpsheight |= gpsheight_bytes[i] << (8*(3-i));
}
height = gpsheight / 1000.0;
gpx.h = height;
if (height < -100 || height > 60000) return -1;
return 0;
}
int get_GPSvel24() {
int i;
unsigned byte;
ui8_t gpsVel_bytes[3];
int vel24;
double vx, vy, vz, dir; //, alpha;
for (i = 0; i < 3; i++) {
byte = frame_bytes[pos_GPSvO + i];
if (byte > 0xFF) return -1;
gpsVel_bytes[i] = byte;
}
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
vx = vel24 / 1e3; // ost
for (i = 0; i < 3; i++) {
byte = frame_bytes[pos_GPSvN + i];
if (byte > 0xFF) return -1;
gpsVel_bytes[i] = byte;
}
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
vy= vel24 / 1e3; // nord
for (i = 0; i < 3; i++) {
byte = frame_bytes[pos_GPSvV + i];
if (byte > 0xFF) return -1;
gpsVel_bytes[i] = byte;
}
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
vz = vel24 / 1e3; // hoch
gpx.vE = vx;
gpx.vN = vy;
gpx.vU = vz;
gpx.vH = sqrt(vx*vx+vy*vy);
/*
alpha = atan2(vy, vx)*180/M_PI; // ComplexPlane (von x-Achse nach links) - GeoMeteo (von y-Achse nach rechts)
dir = 90-alpha; // z=x+iy= -> i*conj(z)=y+ix=re(i(pi/2-t)), Achsen und Drehsinn vertauscht
if (dir < 0) dir += 360; // atan2(y,x)=atan(y/x)=pi/2-atan(x/y) , atan(1/t) = pi/2 - atan(t)
gpx.vD2 = dir;
*/
dir = atan2(vx, vy) * 180 / M_PI;
if (dir < 0) dir += 360;
gpx.vD = dir;
gpx.vV = vz;
return 0;
}
void print_frame(int len) {
int i, err = 0;
if (len > RAWBITFRAME_LEN) len = RAWBITFRAME_LEN;
for (i = len; i < RAWBITFRAME_LEN; i++) frame_rawbits[i] = 0; // oder: '0'
err = deconv(frame_rawbits, frame_bits);
bits2bytes(frame_bits+K-1, frame_bytes);
if (option_raw) {
if (option_raw == 1) {
for (i = 0; i < len/(2*BITS); i++) printf("%02x ", frame_bytes[i]); printf("\n");
}
else {
for (i = 0; i < len; i++) printf("%c", frame_rawbits[i]); printf("\n");
}
}
else if (!err && len > 8*2*(pos_GPSTOW+4)) {
if ((frame_bytes[0] & 0xF0) == 0x70) // ? beginnen alle SNs mit 0x7A.... bzw 80..... ?
{
get_FrameNb();
get_GPStime();
get_SondeSN();
if (option_verbose) printf(" (%7d) ", gpx.sn);
printf(" [%5d] ", gpx.frnr);
printf("%s ", weekday[gpx.wday]);
printf("(%02d:%02d:%06.3f) ", gpx.std, gpx.min, gpx.sek); // falls Rundung auf 60s: Ueberlauf
get_GPSlat();
get_GPSlon();
err = get_GPSalt();
if (!err) {
printf(" lat: %.6f° ", gpx.lat);
printf(" lon: %.6f° ", gpx.lon);
printf(" alt: %.2fm ", gpx.h);
//if (option_verbose)
{
get_GPSvel24();
//if (option_verbose == 2) printf(" (%.1f ,%.1f,%.1f) ", gpx.vE, gpx.vN, gpx.vU);
printf(" vH: %.1fm/s D: %.1f° vV: %.1fm/s ", gpx.vH, gpx.vD, gpx.vV);
}
}
printf("\n");
}
}
}
int main(int argc, char **argv) {
FILE *fp;
char *fpname;
int i, bit, len, rbit, rbit0;
int pos;
//int header_found = 0;
fpname = argv[0];
++argv;
while ((*argv) && (!wavloaded)) {
if ( (strcmp(*argv, "-h") == 0) || (strcmp(*argv, "--help") == 0) ) {
fprintf(stderr, "%s [options] audio.wav\n", fpname);
fprintf(stderr, " options:\n");
fprintf(stderr, " -v, --verbose\n");
fprintf(stderr, " -r, --raw\n");
return 0;
}
else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
option_verbose = 1;
}
//else if ( (strcmp(*argv, "-vv") == 0) ) option_verbose = 2;
else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
option_raw = 1;
}
else if ( (strcmp(*argv, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) {
option_raw = 2;
}
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
option_inv = 1; // unnoetig, NRZ-S...
}
else if (strcmp(*argv, "--res") == 0) { option_res = 1; }
else {
fp = fopen(*argv, "rb");
if (fp == NULL) {
fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv);
return -1;
}
wavloaded = 1;
}
++argv;
}
if (!wavloaded) fp = stdin;
i = read_wav_header(fp);
if (i) {
fclose(fp);
return -1;
}
pos = FRAMESTART;
rbit0 = 0; //idle
while (!read_bits_fsk(fp, &rbit, &len)) {
if (len == 0) { // reset_frame();
/*if (pos > 8*2*pos_GPSlon) {
//for (i = pos; i < RAWBITFRAME_LEN; i++) frame_rawbits[i] = '0';
print_frame(pos);
//header_found = 0;
pos = FRAMESTART;
}*/
//inc_bufpos();
//buf[bufpos] = 'x';
continue; // ...
}
for (i = 0; i < len; i++) {
inc_bufpos();
bit = 0x30 + (rbit==rbit0); // Ascii, NRZ-S
buf[bufpos] = bit;
rbit0 = rbit;
if (pos < RAWBITFRAME_LEN) frame_rawbits[pos] = bit;
pos++;
if ( compare2() ) { // GPS: (36+3)
print_frame(pos);//FRAME_LEN
//header_found = 0;
pos = FRAMESTART;
}
}
}
printf("\n");
fclose(fp);
return 0;
}