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RS-tracker/rs41/rs41iq.c

1904 wiersze
55 KiB
C
Czysty Bezpośredni odnośnik Wina Historia

/*
* radiosondes RS41-SG(P)
* author: zilog80
*
* compile:
* gcc rs41iq.c -lm -o rs41iq
* (includes bch_ecc.c)
* usage:
* ./rs41iq [options] audio.wav
* options:
* -v, -vx, -vv (info, aux, info/conf)
* -r, --raw
* -i, --invert
* -b (alt. Demod.)
* --crc (check CRC)
* --ecc2 (Reed-Solomon)
* --ptu (temperature)
* --iq
* --iq2==--iq3
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <complex.h>
#ifdef CYGWIN
#include <fcntl.h> // cygwin: _setmode()
#include <io.h>
#endif
typedef unsigned char ui8_t;
typedef unsigned short ui16_t;
typedef unsigned int ui32_t;
typedef short i16_t;
typedef int i32_t;
#include "bch_ecc.c" // RS/ecc/
typedef struct {
int typ;
int msglen;
int msgpos;
int parpos;
int hdrlen;
int frmlen;
} rscfg_t;
rscfg_t cfg_rs41 = { 41, (320-56)/2, 56, 8, 8, 320};
typedef struct {
int frnr;
char id[9];
int week; int gpssec;
int jahr; int monat; int tag;
int wday;
int std; int min; float sek;
double lat; double lon; double alt;
double vN; double vE; double vU;
double vH; double vD; double vD2;
float T;
ui32_t crc;
} gpx_t;
gpx_t gpx;
int option_verbose = 0, // ausfuehrliche Anzeige
option_raw = 0, // rohe Frames
option_inv = 0, // invertiert Signal
option_res = 0, // genauere Bitmessung
option_crc = 0, // check CRC
option_avg = 0, // moving average
option_b = 0,
option_ecc = 0, // Reed-Solomon ECC
option_sat = 0, // GPS sat data
option_ptu = 0,
option_len = 0,
option_iq = 0,
wavloaded = 0;
int wav_channel = 0; // audio channel: left
int rawin = 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 NDATA_LEN 320 // std framelen 320
#define XDATA_LEN 198
#define FRAME_LEN (NDATA_LEN+XDATA_LEN) // max framelen 518
ui8_t //xframe[FRAME_LEN] = { 0x10, 0xB6, 0xCA, 0x11, 0x22, 0x96, 0x12, 0xF8}, = xorbyte( frame)
frame[FRAME_LEN] = { 0x86, 0x35, 0xf4, 0x40, 0x93, 0xdf, 0x1a, 0x60}; // = xorbyte(xframe)
char buffer_rawin[3*FRAME_LEN+12]; //## rawin1: buffer_rawin[2*FRAME_LEN+12];
int frameofs = 0;
#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
*/
/* ------------------------------------------------------------------------------------ */
int LOG2N;
int N_DFT, M_DFT;
int N_IQBUF;
double complex *raw_iqbuf = NULL;
double complex *rot_iqbuf = NULL;
int Nvar = 0;
float *bufvar = NULL;
float xsum = 0,
qsum = 0;
float mu, bvar[FRAME_LEN];
/* ------------------------------------------------------------------------------------ */
// option_b: exakte Baudrate wichtig!
// im Prinzip in sync-preamble/header ermittelbar
#define BAUD_RATE 4800
int sample_rate = 0, bits_sample = 0, channels = 0;
float samples_per_bit = 0;
int findstr(char *buff, char *str, int 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[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
#define LEN_movAvg 3
int movAvg[LEN_movAvg];
unsigned long sample_count = 0;
int read_sample(FILE *fp, double *x) { // channels == 1
int i;
short b = 0;
for (i = 0; i < channels; i++) {
// i = 0: links bzw. mono
if (fread( &b, bits_sample/8, 1, fp) != 1) return EOF;
if (i == wav_channel) {
if (bits_sample == 8) { b -= 128; }
*x = b/128.0;
if (bits_sample == 16) { *x /= 256.0; }
}
}
return 0;
}
int read_csample(FILE *fp, double complex *z) {
short x = 0, y = 0;
if (fread( &x, bits_sample/8, 1, fp) != 1) return EOF;
if (fread( &y, bits_sample/8, 1, fp) != 1) return EOF;
*z = x + I*y;
if (bits_sample == 8) { *z -= 128 + I*128; }
*z /= 128.0;
if (bits_sample == 16) { *z /= 256.0; }
return 0;
}
int sample_head_start = 0;
int sample_framestart = 0;
int sample_posnoise = 0;
double df = 0.0;
int len_sq = 0;
double V_noise = 0.0;
double V_signal = 0.0;
double SNRdB = 0.0;
int read_signed_sample(FILE *fp, double *s) { // int = i32_t
double x=0, x0=0;
double complex z, w;
static double complex z0;
double gain = 1.0;
if (option_iq) {
if ( read_csample(fp, &z) == EOF ) return EOF;
raw_iqbuf[sample_count % N_IQBUF] = z;
double t = (double)(sample_count) / sample_rate;
z *= cexp(-t*2*M_PI*df*I);
w = z * conj(z0);
x = gain * carg(w)/M_PI; // d1
//x = _gain * cimag(w) / (cabs(z0)*cabs(z0)); // for small angles ... d2
z0 = z;
rot_iqbuf[sample_count % N_IQBUF] = z;
if (sample_posnoise > 0)
{
if (sample_count >= sample_framestart && sample_count < sample_framestart+len_sq) {
if (sample_count == sample_framestart) V_signal = 0.0;
V_signal += cabs(z);
}
if (sample_count == sample_framestart+len_sq) V_signal /= (double)len_sq;
if (sample_count >= sample_posnoise && sample_count < sample_posnoise+len_sq) {
if (sample_count == sample_posnoise) V_noise = 0.0;
V_noise += cabs(z);
}
if (sample_count == sample_posnoise+len_sq) {
V_noise = V_noise/(double)len_sq;
#if defined(DBG) || defined(DBG1)
if (V_signal > 0 && V_noise > 0) {
// iq-samples/V [-1..1]
// dBw = 2*dBv, P=c*U*U
// dBw = 2*10*log10(V/V0)
SNRdB = 20.0 * log10(V_signal/V_noise+1e-20);
fprintf(stderr, "SNR: %.2f dB\n", SNRdB);
}
#endif
}
}
#ifdef DBG1
if ( sample_framestart > 0 && sample_count >= (unsigned long)sample_framestart &&
((int)(sample_count-sample_framestart) % (int)(samples_per_bit*8.0) == 0) ) {
double phase = carg(z); // ignore ISI ...
fprintf(stderr, "%lu phase : %+.2f\n", sample_count, phase/M_PI);
}
#endif
}
else {
if ( read_sample(fp, &x) == EOF ) return EOF;
}
*s = x;
if (option_b)
{
bufvar[sample_count % Nvar] = x;
x0 = bufvar[(sample_count+1) % Nvar];
xsum = xsum - x0 + x;
qsum = qsum - x0*x0 + x*x;
}
sample_count++;
return 0;
}
int par=1, par_alt=1;
int read_bits_fsk(FILE *fp, int *bit, int *len) {
static double sample;
float l;
int n;
n = 0;
do{
if ( read_signed_sample(fp, &sample) == EOF ) return EOF;
par_alt = par;
par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
n++;
} while (par*par_alt > 0);
l = (float)n / samples_per_bit;
*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
/* Y-offset ? */
return 0;
}
int bitstart = 0;
double bitgrenze = 0;
unsigned long scount = 0;
int read_rawbit(FILE *fp, int *bit) {
double sample;
double sum;
double sample0;
int pars;
int n;
sum = 0;
sample0 = 0;
pars = 0;
if (bitstart) {
scount = 1; // (sample_count overflow/wrap-around)
bitgrenze = 0; // d.h. bitgrenze = sample_count-1 (?)
bitstart = 0;
}
bitgrenze += samples_per_bit;
n = 0;
do {
if ( read_signed_sample(fp, &sample) == EOF ) return EOF;
//par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
sum += sample;
if (sample * sample0 < 0) pars++; // wenn sample[0..n-1]=0 ...
sample0 = sample;
scount++;
n++;
} while (scount < bitgrenze); // n < samples_per_bit
if (sum >= 0) *bit = 1;
else *bit = 0;
if (option_inv) *bit ^= 1;
if (option_iq >= 2) {
double h = 1.0; // modulation index, GFSK; h(rs41)=0.8?
double complex z = 0;
double complex X1 = 0;
double complex X2 = 0;
int cbit = 0;
if (option_iq == 2) {
double t = 1.0 / sample_rate;
double f1 = -h*sample_rate/(2*samples_per_bit);
double f2 = -f1;
while (n > 0) {
t = -n / (double)sample_rate;
z = rot_iqbuf[(sample_count-n + N_IQBUF) % N_IQBUF];
X1 += z*cexp(-t*2*M_PI*f1*I);
X2 += z*cexp(-t*2*M_PI*f2*I);
n--;
}
}
else {
double complex xi1 = cexp(+I*M_PI*h/samples_per_bit);
double complex xi2 = cexp(-I*M_PI*h/samples_per_bit);
double complex x1 = xi1;
double complex x2 = xi2;
while (n > 0) {
z = rot_iqbuf[(sample_count-n + N_IQBUF) % N_IQBUF];
X1 += z*x1; x1 *= xi1;
X2 += z*x2; x2 *= xi2;
n--;
}
}
if (cabs(X1) < cabs(X2)) cbit = 1; else cbit = 0;
#ifdef DBG2
fprintf(stderr, "bit: %d # X1: %+.4f %+.4fi | X2: %+.4f %+.4fi", *bit, creal(X1), cimag(X1), creal(X2), cimag(X2));
fprintf(stderr, " # |X1|: %.4f |X2|: %.4f", cabs(X1), cabs(X2));
fprintf(stderr, " # |X2|-|X1|: %+.4f", cabs(X2)-cabs(X1));
fprintf(stderr, " # [%c]", (cbit == *bit)?'+':'-');
fprintf(stderr, " (%lu)\n", sample_count);
#endif
*bit = cbit;
}
return pars;
}
/* ------------------------------------------------------------------------------------ */
double complex *xn, *Z, *w, *ew, *ewa;
double *Hann, *db;
int init_dft() {
int i, k, n;
int WLEN = M_DFT;
xn = calloc(N_DFT, sizeof(complex double)); if (xn == NULL) return -1;
Z = calloc(N_DFT, sizeof(complex double)); if (Z == NULL) return -1;
ew = calloc(LOG2N, sizeof(complex double)); if (ew == NULL) return -1;
db = calloc(N_DFT, sizeof(double)); if (db == NULL) return -1;
Hann = calloc(N_DFT, sizeof(complex double)); if (Hann == NULL) return -1;
/*
for (i = 0; i < N_DFT; i++) Hann[i] = 0;
for (i = 0; i < WLEN; i++) Hann[i] = 0.5 * (1 - cos( 2 * M_PI * i / (double)(WLEN-1) ) );
//Hann[i+(N-1-WLEN)/2] = 0.5 * (1 - cos( 2 * M_PI * i / (double)(WLEN-1) ) );
*/
for (i = 0; i < M_DFT; i++) Hann[i] = 0.5 * (1 - cos( 2 * M_PI * i / (double)(M_DFT-1) ) );
for (n = 0; n < LOG2N; n++) {
k = 1 << n;
ew[n] = cexp(-I*M_PI/(double)k);
}
return 0;
}
int free_dft() {
if (xn) { free(xn); xn = NULL; }
if (Z ) { free(Z ); Z = NULL; }
if (ew) { free(ew); ew = NULL; }
if (db) { free(db); db = NULL; }
if (Hann) { free(Hann); Hann = NULL; }
return 0;
}
void dft2() {
int s, l, l2, i, j, k;
double complex w1, w2, T;
for (i = 0; i < N_DFT; i++) Z[i] = /*(double complex)*/xn[i];
//Z = xn;
j = 1;
for (i = 1; i < N_DFT; i++) {
if (i < j) {
T = Z[j-1];
Z[j-1] = Z[i-1];
Z[i-1] = T;
}
k = N_DFT/2;
while (k < j) {
j = j - k;
k = k/2;
}
j = j + k;
}
for (s = 0; s < LOG2N; s++) {
l2 = 1 << s;
l = l2 << 1;
w1 = (double complex)1.0;
w2 = cexp(-I*M_PI/(double)l2);
//w2 = ew[s];
for (j = 1; j <= l2; j++) {
for (i = j; i <= N_DFT; i += l) {
k = i + l2;
T = Z[k-1] * w1;
Z[k-1] = Z[i-1] - T;
Z[i-1] = Z[i-1] + T;
}
w1 = w1 * w2;
}
}
}
void db_power(double complex Z[], double db[]) {
int i;
for (i = 0; i < N_DFT; i++) {
db[i] = 20.0 * log10(cabs(Z[i])/N_DFT+1e-20);
}
}
float bin2freq(int k) {
float fq = sample_rate * k / N_DFT;
if (fq > sample_rate/2.0) fq -= sample_rate;
return fq;
}
int max_bin() {
int k, kmax;
double max;
max = 0; kmax = 0;
for (k = 0; k < N_DFT; k++) {
if (cabs(Z[k]) > max) {
max = cabs(Z[k]);
kmax = k;
}
}
return kmax;
}
/* ------------------------------------------------------------------------------------ */
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[HEADOFS+HEADLEN-1-i]) break;
j--;
i++;
}
return i;
}
/*
ui8_t xorbyte(int pos) {
return xframe[pos] ^ mask[pos % MASK_LEN];
}
*/
ui8_t framebyte(int pos) {
return frame[pos];
}
/* ------------------------------------------------------------------------------------ */
/*
* 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;
}
/* ------------------------------------------------------------------------------------ */
ui32_t u4(ui8_t *bytes) { // 32bit unsigned int
ui32_t val = 0;
memcpy(&val, bytes, 4);
return val;
}
ui32_t u3(ui8_t *bytes) { // 24bit unsigned int
int val24 = 0;
val24 = bytes[0] | (bytes[1]<<8) | (bytes[2]<<16);
// = memcpy(&val, bytes, 3), val &= 0x00FFFFFF;
return val24;
}
int i3(ui8_t *bytes) { // 24bit signed int
int val = 0,
val24 = 0;
val = bytes[0] | (bytes[1]<<8) | (bytes[2]<<16);
val24 = val & 0xFFFFFF; if (val24 & 0x800000) val24 = val24 - 0x1000000;
return val24;
}
ui32_t u2(ui8_t *bytes) { // 16bit unsigned int
return bytes[0] | (bytes[1]<<8);
}
/*
double r8(ui8_t *bytes) {
double val = 0;
memcpy(&val, bytes, 8);
return val;
}
float r4(ui8_t *bytes) {
float val = 0;
memcpy(&val, bytes, 4);
return val;
}
*/
/*
int crc16x(int start, int len) {
int crc16poly = 0x1021;
int rem = 0xFFFF, i, j;
int xbyte;
if (start+len+2 > FRAME_LEN) return -1;
for (i = 0; i < len; i++) {
xbyte = xorbyte(start+i);
rem = rem ^ (xbyte << 8);
for (j = 0; j < 8; j++) {
if (rem & 0x8000) {
rem = (rem << 1) ^ crc16poly;
}
else {
rem = (rem << 1);
}
rem &= 0xFFFF;
}
}
return rem;
}
*/
int crc16(int start, int len) {
int crc16poly = 0x1021;
int rem = 0xFFFF, i, j;
int byte;
if (start+len+2 > FRAME_LEN) return -1;
for (i = 0; i < len; i++) {
byte = framebyte(start+i);
rem = rem ^ (byte << 8);
for (j = 0; j < 8; j++) {
if (rem & 0x8000) {
rem = (rem << 1) ^ crc16poly;
}
else {
rem = (rem << 1);
}
rem &= 0xFFFF;
}
}
return rem;
}
int check_CRC(ui32_t pos, ui32_t pck) {
ui32_t crclen = 0,
crcdat = 0;
if (((pck>>8) & 0xFF) != frame[pos]) return -1;
crclen = frame[pos+1];
if (pos + crclen + 4 > FRAME_LEN) return -1;
crcdat = u2(frame+pos+2+crclen);
if ( crcdat != crc16(pos+2, crclen) ) {
return 1; // CRC NO
}
else return 0; // CRC OK
}
/*
Pos: SubHeader, 1+1 byte (ID+LEN)
0x039: 7928 FrameNumber+SondeID
+(0x050: 0732 CalFrames 0x00..0x32)
0x065: 7A2A PTU
0x093: 7C1E GPS1: RXM-RAW (0x02 0x10) Week, TOW, Sats
0x0B5: 7D59 GPS2: RXM-RAW (0x02 0x10) pseudorange, doppler
0x112: 7B15 GPS3: NAV-SOL (0x01 0x06) ECEF-POS, ECEF-VEL
0x12B: 7611 00
0x12B: 7Exx AUX-xdata
*/
#define crc_FRAME (1<<0)
#define xor_FRAME 0x1713 // ^0x6E3B=0x7928
#define pck_FRAME 0x7928
#define pos_FRAME 0x039
#define pos_FrameNb 0x03B // 2 byte
#define pos_SondeID 0x03D // 8 byte
#define pos_CalData 0x052 // 1 byte, counter 0x00..0x32
#define pos_Calfreq 0x055 // 2 byte, calfr 0x00
#define pos_Calburst 0x05E // 1 byte, calfr 0x02
// ? #define pos_Caltimer 0x05A // 2 byte, calfr 0x02 ?
#define pos_CalRSTyp 0x05B // 8 byte, calfr 0x21 (+2 byte in 0x22?)
// weitere chars in calfr 0x22/0x23; weitere ID
#define crc_PTU (1<<1)
#define pck_PTU 0x7A2A // PTU
#define pos_PTU 0x065
#define crc_GPS1 (1<<2)
#define xor_GPS1 0x9667 // ^0xEA79=0x7C1E
#define pck_GPS1 0x7C1E // RXM-RAW (0x02 0x10)
#define pos_GPS1 0x093
#define pos_GPSweek 0x095 // 2 byte
#define pos_GPSiTOW 0x097 // 4 byte
#define pos_satsN 0x09B // 12x2 byte (1: SV, 1: quality,strength)
#define crc_GPS2 (1<<3)
#define pck_GPS2 0x7D59 // RXM-RAW (0x02 0x10)
#define pos_GPS2 0x0B5
#define pos_minPR 0x0B7 // 4 byte
#define pos_FF 0x0BB // 1 byte
#define pos_dataSats 0x0BC // 12x(4+3) byte (4: pseudorange, 3: doppler)
#define crc_GPS3 (1<<4)
#define xor_GPS3 0xB9FF // ^0xC2EA=0x7B15
#define pck_GPS3 0x7B15 // NAV-SOL (0x01 0x06)
#define pos_GPS3 0x112
#define pos_GPSecefX 0x114 // 4 byte
#define pos_GPSecefY 0x118 // 4 byte
#define pos_GPSecefZ 0x11C // 4 byte
#define pos_GPSecefV 0x120 // 3*2 byte
#define pos_numSats 0x126 // 1 byte
#define pos_sAcc 0x127 // 1 byte
#define pos_pDOP 0x128 // 1 byte
#define crc_AUX (1<<5)
#define pck_AUX 0x7E00 // LEN variable
#define pos_AUX 0x12B
#define crc_ZERO (1<<6) // LEN variable
#define pck_ZERO 0x7600
ui8_t calibytes[51*16];
ui8_t calfrchk[51];
float Rf1, // ref-resistor f1 (750 Ohm)
Rf2, // ref-resistor f2 (1100 Ohm)
co1[3], // { -243.911 , 0.187654 , 8.2e-06 }
calT1[3], // calibration T1
co2[3], // { -243.911 , 0.187654 , 8.2e-06 }
calT2[3]; // calibration T2-Hum
double c = 299.792458e6;
double L1 = 1575.42e6;
int get_SatData() {
int i, n;
int sv;
ui32_t minPR;
int Nfix;
double pDOP, sAcc;
fprintf(stdout, "[%d]\n", u2(frame+pos_FrameNb));
fprintf(stdout, "iTOW: 0x%08X", u4(frame+pos_GPSiTOW));
fprintf(stdout, " week: 0x%04X", u2(frame+pos_GPSweek));
fprintf(stdout, "\n");
minPR = u4(frame+pos_minPR);
fprintf(stdout, "minPR: %d", minPR);
fprintf(stdout, "\n");
for (i = 0; i < 12; i++) {
n = i*7;
sv = frame[pos_satsN+2*i];
if (sv == 0xFF) break;
fprintf(stdout, " SV: %2d # ", sv);
fprintf(stdout, "prMes: %.1f", u4(frame+pos_dataSats+n)/100.0 + minPR);
fprintf(stdout, " ");
fprintf(stdout, "doMes: %.1f", -i3(frame+pos_dataSats+n+4)/100.0*L1/c);
fprintf(stdout, "\n");
}
fprintf(stdout, "ECEF-POS: (%d,%d,%d)\n",
(i32_t)u4(frame+pos_GPSecefX),
(i32_t)u4(frame+pos_GPSecefY),
(i32_t)u4(frame+pos_GPSecefZ));
fprintf(stdout, "ECEF-VEL: (%d,%d,%d)\n",
(i16_t)u2(frame+pos_GPSecefV+0),
(i16_t)u2(frame+pos_GPSecefV+2),
(i16_t)u2(frame+pos_GPSecefV+4));
Nfix = frame[pos_numSats];
sAcc = frame[pos_sAcc]/10.0;
pDOP = frame[pos_pDOP]/10.0;
fprintf(stdout, "numSatsFix: %2d sAcc: %.1f pDOP: %.1f\n", Nfix, sAcc, pDOP);
fprintf(stdout, "CRC: ");
fprintf(stdout, " %04X", pck_GPS1);
if (check_CRC(pos_GPS1, pck_GPS1)==0) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
//fprintf(stdout, "[%+d]", check_CRC(pos_GPS1, pck_GPS1));
fprintf(stdout, " %04X", pck_GPS2);
if (check_CRC(pos_GPS2, pck_GPS2)==0) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
//fprintf(stdout, "[%+d]", check_CRC(pos_GPS2, pck_GPS2));
fprintf(stdout, " %04X", pck_GPS3);
if (check_CRC(pos_GPS3, pck_GPS3)==0) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
//fprintf(stdout, "[%+d]", check_CRC(pos_GPS3, pck_GPS3));
fprintf(stdout, "\n");
fprintf(stdout, "\n");
return 0;
}
int get_FrameNb() {
int i;
unsigned byte;
ui8_t frnr_bytes[2];
int frnr;
for (i = 0; i < 2; i++) {
byte = framebyte(pos_FrameNb + i);
frnr_bytes[i] = byte;
}
frnr = frnr_bytes[0] + (frnr_bytes[1] << 8);
gpx.frnr = frnr;
return 0;
}
int get_SondeID(int crc) {
int i;
unsigned byte;
char sondeid_bytes[9];
if (crc == 0) {
for (i = 0; i < 8; i++) {
byte = framebyte(pos_SondeID + i);
//if ((byte < 0x20) || (byte > 0x7E)) return -1;
sondeid_bytes[i] = byte;
}
sondeid_bytes[8] = '\0';
if ( strncmp(gpx.id, sondeid_bytes, 8) != 0 ) {
//for (i = 0; i < 51; i++) calfrchk[i] = 0;
memset(calfrchk, 0, 51);
memcpy(gpx.id, sondeid_bytes, 8);
gpx.id[8] = '\0';
}
}
return 0;
}
int get_FrameConf() {
int crc, err;
ui8_t calfr;
int i;
crc = check_CRC(pos_FRAME, pck_FRAME);
if (crc) gpx.crc |= crc_FRAME;
err = crc;
err |= get_FrameNb();
err |= get_SondeID(crc);
if (crc == 0) {
calfr = framebyte(pos_CalData);
if (calfrchk[calfr] == 0) // const?
{ // 0x32 not constant
for (i = 0; i < 16; i++) {
calibytes[calfr*16 + i] = framebyte(pos_CalData+1+i);
}
calfrchk[calfr] = 1;
}
}
return err;
}
int get_CalData() {
memcpy(&Rf1, calibytes+61, 4); // 0x03*0x10+13
memcpy(&Rf2, calibytes+65, 4); // 0x04*0x10+ 1
memcpy(co1+0, calibytes+77, 4); // 0x04*0x10+13
memcpy(co1+1, calibytes+81, 4); // 0x05*0x10+ 1
memcpy(co1+2, calibytes+85, 4); // 0x05*0x10+ 5
memcpy(calT1+0, calibytes+89, 4); // 0x05*0x10+ 9
memcpy(calT1+1, calibytes+93, 4); // 0x05*0x10+13
memcpy(calT1+2, calibytes+97, 4); // 0x06*0x10+ 1
memcpy(co2+0, calibytes+293, 4); // 0x12*0x10+ 5
memcpy(co2+1, calibytes+297, 4); // 0x12*0x10+ 9
memcpy(co2+2, calibytes+301, 4); // 0x12*0x10+13
memcpy(calT2+0, calibytes+305, 4); // 0x13*0x10+ 1
memcpy(calT2+1, calibytes+309, 4); // 0x13*0x10+ 5
memcpy(calT2+2, calibytes+313, 4); // 0x13*0x10+ 9
return 0;
}
float get_Tc0(ui32_t f, ui32_t f1, ui32_t f2) {
// y = (f - f1) / (f2 - f1);
// y1 = (f - f1) / f2; // = (1 - f1/f2)*y
float a = 3.9083e-3, // Pt1000 platinum resistance
b = -5.775e-7,
c = -4.183e-12; // below 0C, else C=0
float *cal = calT1;
float Rb = (f1*Rf2-f2*Rf1)/(f2-f1), // ofs
Ra = f * (Rf2-Rf1)/(f2-f1) - Rb,
raw = Ra/1000.0,
g_r = 0.8024*cal[0] + 0.0176, // empirisch
r_o = 0.0705*cal[1] + 0.0011, // empirisch
r = raw * g_r + r_o,
t = (-a + sqrt(a*a + 4*b*(r-1)))/(2*b); // t>0: c=0
// R/R0 = 1 + at + bt^2 + c(t-100)t^3 , R0 = 1000 Ohm, t/Celsius
return t;
}
float get_Tc(ui32_t f, ui32_t f1, ui32_t f2) {
float *p = co1;
float *c = calT1;
float g = (float)(f2-f1)/(Rf2-Rf1), // gain
Rb = (f1*Rf2-f2*Rf1)/(float)(f2-f1), // ofs
Rc = f/g - Rb,
//R = (Rc + c[1]) * c[0],
//T = p[0] + p[1]*R + p[2]*R*R;
R = Rc * c[0],
T = (p[0] + p[1]*R + p[2]*R*R + c[1])*(1.0 + c[2]);
return T;
}
int get_PTU() {
int err=0, i;
int bR, bc1, bT1,
bc2, bT2;
ui32_t meas[12];
float Tc = -273.15;
float Tc0 = -273.15;
get_CalData();
err = check_CRC(pos_PTU, pck_PTU);
if (err) gpx.crc |= crc_PTU;
if (err == 0) {
for (i = 0; i < 12; i++) {
meas[i] = u3(frame+pos_PTU+2+3*i);
}
bR = calfrchk[0x03] && calfrchk[0x04];
bc1 = calfrchk[0x04] && calfrchk[0x05];
bT1 = calfrchk[0x05] && calfrchk[0x06];
bc2 = calfrchk[0x12] && calfrchk[0x13];
bT2 = calfrchk[0x13];
if (bR && bc1 && bT1) {
Tc = get_Tc(meas[0], meas[1], meas[2]);
Tc0 = get_Tc0(meas[0], meas[1], meas[2]);
}
gpx.T = Tc;
if (option_verbose == 4)
{
printf(" h: %8.2f # ", gpx.alt); // crc_GPS3 ?
printf("1: %8d %8d %8d", meas[0], meas[1], meas[2]);
printf(" # ");
printf("2: %8d %8d %8d", meas[3], meas[4], meas[5]);
printf(" # ");
printf("3: %8d %8d %8d", meas[6], meas[7], meas[8]);
printf(" # ");
if (Tc > -273.0) {
printf(" T: %8.4f , T0: %8.4f ", Tc, Tc0);
}
printf("\n");
if (gpx.alt > -100.0) {
printf(" %9.2f ; %6.1f ; %6.1f ", gpx.alt, Rf1, Rf2);
printf("; %10.6f ; %10.6f ; %10.6f ;", calT1[0], calT1[1], calT1[2]);
printf(" %8d ; %8d ; %8d ", meas[0], meas[1], meas[2]);
printf("; %10.6f ; %10.6f ; %10.6f ;", calT2[0], calT2[1], calT2[2]);
printf(" %8d ; %8d ; %8d" , meas[6], meas[7], meas[8]);
printf("\n");
}
}
}
return err;
}
int get_GPSweek() {
int i;
unsigned byte;
ui8_t gpsweek_bytes[2];
int gpsweek;
for (i = 0; i < 2; i++) {
byte = framebyte(pos_GPSweek + i);
gpsweek_bytes[i] = byte;
}
gpsweek = gpsweek_bytes[0] + (gpsweek_bytes[1] << 8);
//if (gpsweek < 0) { gpx.week = -1; return -1; } // (short int)
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;
int ms;
for (i = 0; i < 4; i++) {
byte = framebyte(pos_GPSiTOW + i);
gpstime_bytes[i] = byte;
}
memcpy(&gpstime, gpstime_bytes, 4);
ms = gpstime % 1000;
gpstime /= 1000;
gpx.gpssec = gpstime;
day = (gpstime / (24 * 3600)) % 7;
//if ((day < 0) || (day > 6)) return -1; // besser CRC-check
gpstime %= (24*3600);
gpx.wday = day;
gpx.std = gpstime / 3600;
gpx.min = (gpstime % 3600) / 60;
gpx.sek = gpstime % 60 + ms/1000.0;
return 0;
}
int get_GPS1() {
int err=0;
// ((framebyte(pos_GPS1)<<8) | framebyte(pos_GPS1+1)) != pck_GPS1 ?
if ( framebyte(pos_GPS1) != ((pck_GPS1>>8) & 0xFF) ) {
gpx.crc |= crc_GPS1;
return -1;
}
err = check_CRC(pos_GPS1, pck_GPS1);
if (err) gpx.crc |= crc_GPS1;
//err = 0;
err |= get_GPSweek();
err |= get_GPStime();
return err;
}
int get_GPS2() {
int err=0;
err = check_CRC(pos_GPS2, pck_GPS2);
if (err) gpx.crc |= crc_GPS2;
return err;
}
#define EARTH_a 6378137.0
#define EARTH_b 6356752.31424518
#define EARTH_a2_b2 (EARTH_a*EARTH_a - EARTH_b*EARTH_b)
double a = EARTH_a,
b = EARTH_b,
a_b = EARTH_a2_b2,
e2 = EARTH_a2_b2 / (EARTH_a*EARTH_a),
ee2 = EARTH_a2_b2 / (EARTH_b*EARTH_b);
void ecef2elli(double X[], double *lat, double *lon, double *alt) {
double phi, lam, R, p, t;
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] + ee2 * b * sin(t)*sin(t)*sin(t) ,
p - e2 * a * cos(t)*cos(t)*cos(t) );
R = a / sqrt( 1 - e2*sin(phi)*sin(phi) );
*alt = 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, alt;
ui8_t gpsVel_bytes[2];
short vel16; // 16bit
double V[3], phi, lam, dir;
for (k = 0; k < 3; k++) {
for (i = 0; i < 4; i++) {
byte = frame[pos_GPSecefX + 4*k + i];
XYZ_bytes[i] = byte;
}
memcpy(&XYZ, XYZ_bytes, 4);
X[k] = XYZ / 100.0;
for (i = 0; i < 2; i++) {
byte = frame[pos_GPSecefV + 2*k + i];
gpsVel_bytes[i] = byte;
}
vel16 = gpsVel_bytes[0] | gpsVel_bytes[1] << 8;
V[k] = vel16 / 100.0;
}
// ECEF-Position
ecef2elli(X, &lat, &lon, &alt);
gpx.lat = lat;
gpx.lon = lon;
gpx.alt = alt;
if ((alt < -1000) || (alt > 80000)) return -3;
// ECEF-Velocities
// ECEF-Vel -> NorthEastUp
phi = lat*M_PI/180.0;
lam = lon*M_PI/180.0;
gpx.vN = -V[0]*sin(phi)*cos(lam) - V[1]*sin(phi)*sin(lam) + V[2]*cos(phi);
gpx.vE = -V[0]*sin(lam) + V[1]*cos(lam);
gpx.vU = V[0]*cos(phi)*cos(lam) + V[1]*cos(phi)*sin(lam) + V[2]*sin(phi);
// NEU -> HorDirVer
gpx.vH = sqrt(gpx.vN*gpx.vN+gpx.vE*gpx.vE);
/*
double alpha;
alpha = atan2(gpx.vN, gpx.vE)*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(gpx.vE, gpx.vN) * 180 / M_PI;
if (dir < 0) dir += 360;
gpx.vD = dir;
return 0;
}
int get_GPS3() {
int err=0;
// ((framebyte(pos_GPS3)<<8) | framebyte(pos_GPS3+1)) != pck_GPS3 ?
if ( framebyte(pos_GPS3) != ((pck_GPS3>>8) & 0xFF) ) {
gpx.crc |= crc_GPS3;
return -1;
}
err = check_CRC(pos_GPS3, pck_GPS3);
if (err) gpx.crc |= crc_GPS3;
err |= get_GPSkoord();
return err;
}
int get_Aux() {
//
// "Ozone Sounding with Vaisala Radiosonde RS41" user's guide
//
int i, auxlen, auxcrc, count7E, pos7E;
count7E = 0;
pos7E = pos_AUX;
// 7Exx: xdata
while ( pos7E < FRAME_LEN && framebyte(pos7E) == 0x7E ) {
auxlen = framebyte(pos7E+1);
auxcrc = framebyte(pos7E+2+auxlen) | (framebyte(pos7E+2+auxlen+1)<<8);
if ( auxcrc == crc16(pos7E+2, auxlen) ) {
if (count7E == 0) fprintf(stdout, "\n # xdata = ");
else fprintf(stdout, " # ");
//fprintf(stdout, " # %02x : ", framebyte(pos7E+2));
for (i = 1; i < auxlen; i++) {
fprintf(stdout, "%c", framebyte(pos7E+2+i));
}
count7E++;
pos7E += 2+auxlen+2;
}
else {
pos7E = FRAME_LEN;
gpx.crc |= crc_AUX;
}
}
i = check_CRC(pos7E, 0x7600); // 0x76xx: 00-padding block
if (i) gpx.crc |= crc_ZERO;
return count7E;
}
int get_Calconf(int out) {
int i;
unsigned byte;
ui8_t calfr = 0;
ui8_t burst = 0;
ui16_t fw = 0;
int freq = 0, f0 = 0, f1 = 0;
char sondetyp[9];
int err = 0;
byte = framebyte(pos_CalData);
calfr = byte;
err = check_CRC(pos_FRAME, pck_FRAME);
if (option_verbose == 3) {
fprintf(stdout, "\n"); // fflush(stdout);
fprintf(stdout, "[%5d] ", gpx.frnr);
fprintf(stdout, " 0x%02x: ", calfr);
for (i = 0; i < 16; i++) {
byte = framebyte(pos_CalData+1+i);
fprintf(stdout, "%02x ", byte);
}
if (err == 0) fprintf(stdout, "[OK]");
else fprintf(stdout, "[NO]");
fprintf(stdout, " ");
}
if (out)
{
if (calfr == 0x01 && option_verbose /*== 2*/) {
fw = framebyte(pos_CalData+6) | (framebyte(pos_CalData+7)<<8);
if (err == 0) fprintf(stdout, ": fw 0x%04x ", fw);
}
if (calfr == 0x02 && option_verbose /*== 2*/) {
byte = framebyte(pos_Calburst);
burst = byte; // fw >= 0x4ef5, BK irrelevant? (burst-killtimer in 0x31?)
if (err == 0) fprintf(stdout, ": BK %02X ", burst);
if (err == 0 && option_verbose == 3) { // killtimer
int kt = frame[0x5A] + (frame[0x5B] << 8); // short?
if ( kt != 0xFFFF ) fprintf(stdout, ": kt 0x%04x = %dsec = %.1fmin ", kt, kt, kt/60.0);
}
}
if (calfr == 0x00 && option_verbose) {
byte = framebyte(pos_Calfreq) & 0xC0; // erstmal nur oberste beiden bits
f0 = (byte * 10) / 64; // 0x80 -> 1/2, 0x40 -> 1/4 ; dann mal 40
byte = framebyte(pos_Calfreq+1);
f1 = 40 * byte;
freq = 400000 + f1+f0; // kHz;
if (err == 0) fprintf(stdout, ": fq %d ", freq);
}
if (calfr == 0x31 && option_verbose == 3) {
if (err == 0) { // fw >= 0x4ef5: default=[88 77]=0x7788sec=510min
int bt = frame[0x59] + (frame[0x5A] << 8); // short?
if ( bt != 0x0000 ) fprintf(stdout, ": bt 0x%04x = %dsec = %.1fmin ", bt, bt, bt/60.0);
}
}
if (calfr == 0x21 && option_verbose /*== 2*/) { // eventuell noch zwei bytes in 0x22
for (i = 0; i < 9; i++) sondetyp[i] = 0;
for (i = 0; i < 8; i++) {
byte = framebyte(pos_CalRSTyp + i);
if ((byte >= 0x20) && (byte < 0x7F)) sondetyp[i] = byte;
else if (byte == 0x00) sondetyp[i] = '\0';
}
if (err == 0) fprintf(stdout, ": %s ", sondetyp);
}
}
return 0;
}
/*
frame[pos_FRAME-1] == 0x0F: len == NDATA_LEN(320)
frame[pos_FRAME-1] == 0xF0: len == FRAME_LEN(518)
*/
int frametype() { // -4..+4: 0xF0 -> -4 , 0x0F -> +4
int i;
ui8_t b = frame[pos_FRAME-1];
int ft = 0;
for (i = 0; i < 4; i++) {
ft += ((b>>i)&1) - ((b>>(i+4))&1);
}
return ft;
}
/* ------------------------------------------------------------------------------------ */
/*
(uses fec-lib by KA9Q)
ka9q-fec:
gcc -c init_rs_char.c
gcc -c decode_rs_char.c
#include "fec.h" // ka9q-fec
void *rs;
unsigned char codeword1[rs_N], codeword2[rs_N];
rs = init_rs_char( 8, 0x11d, 0, 1, rs_R, 0);
// ka9q-fec301: p(x) = p[0]x^(N-1) + ... + p[N-2]x + p[N-1]
// -> cw[i] = codeword[RS.N-1-i]
*/
#define rs_N 255
#define rs_R 24
#define rs_K (rs_N-rs_R)
ui8_t cw1[rs_N], cw2[rs_N];
int rs41_ecc(int frmlen) {
// richtige framelen wichtig fuer 0-padding
int i, leak, ret = 0;
int errors1, errors2;
ui8_t err_pos1[rs_R], err_pos2[rs_R],
err_val1[rs_R], err_val2[rs_R];
if (frmlen > FRAME_LEN) frmlen = FRAME_LEN;
cfg_rs41.frmlen = frmlen;
cfg_rs41.msglen = (frmlen-56)/2; // msgpos=56;
leak = frmlen % 2;
for (i = frmlen; i < FRAME_LEN; i++) frame[i] = 0; // FRAME_LEN-HDR = 510 = 2*255
for (i = 0; i < rs_R; i++) cw1[i] = frame[cfg_rs41.parpos+i ];
for (i = 0; i < rs_R; i++) cw2[i] = frame[cfg_rs41.parpos+i+rs_R];
for (i = 0; i < rs_K; i++) cw1[rs_R+i] = frame[cfg_rs41.msgpos+2*i ];
for (i = 0; i < rs_K; i++) cw2[rs_R+i] = frame[cfg_rs41.msgpos+2*i+1];
errors1 = rs_decode(cw1, err_pos1, err_val1);
errors2 = rs_decode(cw2, err_pos2, err_val2);
if (option_ecc == 2 && (errors1 < 0 || errors2 < 0)) {
frame[pos_FRAME] = (pck_FRAME>>8)&0xFF; frame[pos_FRAME+1] = pck_FRAME&0xFF;
frame[pos_PTU] = (pck_PTU >>8)&0xFF; frame[pos_PTU +1] = pck_PTU &0xFF;
frame[pos_GPS1] = (pck_GPS1 >>8)&0xFF; frame[pos_GPS1 +1] = pck_GPS1 &0xFF;
frame[pos_GPS2] = (pck_GPS2 >>8)&0xFF; frame[pos_GPS2 +1] = pck_GPS2 &0xFF;
frame[pos_GPS3] = (pck_GPS3 >>8)&0xFF; frame[pos_GPS3 +1] = pck_GPS3 &0xFF;
if (frametype() < -2) {
for (i = NDATA_LEN + 7; i < FRAME_LEN-2; i++) frame[i] = 0;
}
for (i = 0; i < rs_K; i++) cw1[rs_R+i] = frame[cfg_rs41.msgpos+2*i ];
for (i = 0; i < rs_K; i++) cw2[rs_R+i] = frame[cfg_rs41.msgpos+2*i+1];
errors1 = rs_decode(cw1, err_pos1, err_val1);
errors2 = rs_decode(cw2, err_pos2, err_val2);
}
// Wenn Fehler im 00-padding korrigiert wurden,
// war entweder der frame zu kurz, oder
// Fehler wurden falsch korrigiert;
// allerdings ist bei t=12 die Wahrscheinlichkeit,
// dass falsch korrigiert wurde mit 1/t! sehr gering.
// check CRC32
// CRC32 OK:
//for (i = 0; i < cfg_rs41.hdrlen; i++) frame[i] = data[i];
for (i = 0; i < rs_R; i++) {
frame[cfg_rs41.parpos+ i] = cw1[i];
frame[cfg_rs41.parpos+rs_R+i] = cw2[i];
}
for (i = 0; i < rs_K; i++) { // cfg_rs41.msglen <= rs_K
frame[cfg_rs41.msgpos+ 2*i] = cw1[rs_R+i];
frame[cfg_rs41.msgpos+1+2*i] = cw2[rs_R+i];
}
if (leak) {
frame[cfg_rs41.msgpos+2*i] = cw1[rs_R+i];
}
ret = errors1 + errors2;
if (errors1 < 0 || errors2 < 0) {
ret = 0;
if (errors1 < 0) ret |= 0x1;
if (errors2 < 0) ret |= 0x2;
ret = -ret;
}
return ret;
}
/* ------------------------------------------------------------------------------------ */
int print_position(int ec) {
int i;
int err, err0, err1, err2, err3;
int output, out_mask;
err = get_FrameConf();
err1 = get_GPS1();
err2 = get_GPS2();
err3 = get_GPS3();
err0 = get_PTU();
out_mask = crc_FRAME|crc_GPS1|crc_GPS3;
output = ((gpx.crc & out_mask) != out_mask); // (!err || !err1 || !err3);
if (output) {
if (!err) {
fprintf(stdout, "[%5d] ", gpx.frnr);
fprintf(stdout, "(%s) ", gpx.id);
}
if (!err1) {
Gps2Date(gpx.week, gpx.gpssec, &gpx.jahr, &gpx.monat, &gpx.tag);
fprintf(stdout, "%s ", weekday[gpx.wday]);
fprintf(stdout, "%04d-%02d-%02d %02d:%02d:%06.3f",
gpx.jahr, gpx.monat, gpx.tag, gpx.std, gpx.min, gpx.sek);
if (option_verbose == 3) fprintf(stdout, " (W %d)", gpx.week);
}
if (!err3) {
fprintf(stdout, " ");
fprintf(stdout, " lat: %.5f ", gpx.lat);
fprintf(stdout, " lon: %.5f ", gpx.lon);
fprintf(stdout, " alt: %.2f ", gpx.alt);
//if (option_verbose)
{
//fprintf(stdout, " (%.1f %.1f %.1f) ", gpx.vN, gpx.vE, gpx.vU);
fprintf(stdout," vH: %4.1f D: %5.1f° vV: %3.1f ", gpx.vH, gpx.vD, gpx.vU);
}
}
if (option_ptu && !err0) {
if (gpx.T > -273.0) printf(" T=%.1fC ", gpx.T);
}
//if (output)
{
if (option_crc) {
fprintf(stdout, " # ");
if (option_ecc && ec >= 0 && (gpx.crc & 0x1F) != 0) {
int pos, blk, len, crc; // unexpected blocks
int flen = NDATA_LEN;
if (frametype() < 0) flen += XDATA_LEN;
pos = pos_FRAME;
while (pos < flen-1) {
blk = frame[pos]; // 0x80XX: encrypted block
len = frame[pos+1]; // 0x76XX: 00-padding block
crc = check_CRC(pos, blk<<8);
fprintf(stdout, " %02X%02X", frame[pos], frame[pos+1]);
fprintf(stdout, "[%d]", crc&1);
pos = pos+2+len+2;
}
}
else {
fprintf(stdout, "[");
for (i=0; i<5; i++) fprintf(stdout, "%d", (gpx.crc>>i)&1);
fprintf(stdout, "]");
}
if (option_ecc == 2) {
if (ec > 0) fprintf(stdout, " (%d)", ec);
if (ec < 0) {
if (ec == -1) fprintf(stdout, " (-+)");
else if (ec == -2) fprintf(stdout, " (+-)");
else /*ec == -3*/ fprintf(stdout, " (--)");
}
}
}
}
get_Calconf(output);
//if (output)
{
if (option_verbose > 1) get_Aux();
fprintf(stdout, "\n"); // fflush(stdout);
}
}
err |= err1 | err3;
return err;
}
void print_frame(int len) {
int i, ec = 0, ft;
gpx.crc = 0;
//frame[pos_FRAME-1] == 0x0F: len == NDATA_LEN(320)
//frame[pos_FRAME-1] == 0xF0: len == FRAME_LEN(518)
ft = frametype();
if (ft > 2) len = NDATA_LEN;
// STD-frames mit 00 auffuellen fuer Fehlerkorrektur
if (len > NDATA_LEN && len < NDATA_LEN+XDATA_LEN-10) {
if (ft < -2) {
len = NDATA_LEN + 7; // std-O3-AUX-frame
}
}
// AUX-frames mit vielen Fehlern besser mit 00 auffuellen
for (i = len; i < FRAME_LEN-2; i++) {
frame[i] = 0;
}
if (ft > 2 || len == NDATA_LEN) {
frame[FRAME_LEN-2] = 0;
frame[FRAME_LEN-1] = 0;
}
if (len > NDATA_LEN) len = FRAME_LEN;
else len = NDATA_LEN;
if (option_ecc) {
ec = rs41_ecc(len);
}
if (option_raw) {
/*
for (i = 0; i < len; i++) {
byte = framebyte(i);
fprintf(stdout, "%02x", byte);
}
fprintf(stdout, "\n");
*/
if (option_ecc == 2 && ec >= 0) {
if (len < FRAME_LEN && frame[FRAME_LEN-1] != 0) len = FRAME_LEN;
}
for (i = 0; i < len; i++) {
fprintf(stdout, "%02x", frame[i]);
}
if (option_ecc) {
if (ec >= 0) fprintf(stdout, " [OK]"); else fprintf(stdout, " [NO]");
if (option_ecc == 2 && ec > 0) fprintf(stdout, " (%d)", ec);
}
fprintf(stdout, "\n");
// fprintf(stdout, "\n");
}
else if (option_sat) {
get_SatData();
}
else {
print_position(ec);
}
}
int main(int argc, char *argv[]) {
FILE *fp;
char *fpname;
char bitbuf[8];
int bit_count = 0,
byte_count = FRAMESTART,
ft_len = FRAME_LEN,
header_found = 0,
byte, i, j;
int bit, len,
frmlen = FRAME_LEN;
char *pbuf = NULL,
*buf_sp = NULL;
int sumQ, bitQ, Qerror_count;
double ratioQ;
#ifdef CYGWIN
_setmode(fileno(stdin), _O_BINARY); // _fileno(stdin)
#endif
setbuf(stdout, NULL);
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, -vx, -vv (info, aux, info/conf)\n");
fprintf(stderr, " -r, --raw\n");
fprintf(stderr, " -i, --invert\n");
//fprintf(stderr, " --avg (moving average)\n");
fprintf(stderr, " -b (alt. Demod.)\n");
fprintf(stderr, " --crc (check CRC)\n");
fprintf(stderr, " --ecc (Reed-Solomon)\n");
fprintf(stderr, " --std (std framelen 320)\n");
fprintf(stderr, " --std2 (full framelen 518)\n");
fprintf(stderr, " --sat (GPS Sat data)\n");
fprintf(stderr, " --ptu (temperature)\n");
return 0;
}
else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
option_verbose = 1;
}
else if (strcmp(*argv, "-vx") == 0) { option_verbose = 2; }
else if (strcmp(*argv, "-vv") == 0) { option_verbose = 3; }
else if (strcmp(*argv, "-vvv") == 0) { option_verbose = 4; }
else if (strcmp(*argv, "--crc") == 0) { option_crc = 1; }
else if (strcmp(*argv, "--res") == 0) { option_res = 1; }
else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
option_raw = 1;
}
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
option_inv = 1;
}
else if ( (strcmp(*argv, "--avg") == 0) ) {
option_avg = 1;
}
else if (strcmp(*argv, "-b") == 0) { option_b = 1; }
else if (strcmp(*argv, "--ecc" ) == 0) { option_ecc = 1; }
else if (strcmp(*argv, "--ecc2") == 0) { option_ecc = 2; }
else if (strcmp(*argv, "--std" ) == 0) { option_len = 1; frmlen = 320; } // NDATA_LEN
else if (strcmp(*argv, "--std2") == 0) { option_len = 2; frmlen = 518; } // NDATA_LEN+XDATA_LEN
else if (strcmp(*argv, "--sat") == 0) { option_sat = 1; }
else if (strcmp(*argv, "--ptu") == 0) { option_ptu = 1; }
else if (strcmp(*argv, "--ch2") == 0) { wav_channel = 1; } // right channel (default: 0=left)
else if (strcmp(*argv, "--rawin1") == 0) { rawin = 2; } // raw_txt input1
else if (strcmp(*argv, "--rawin2") == 0) { rawin = 3; } // raw_txt input2
else if (strcmp(*argv, "--iq") == 0) { option_iq = 1; } // differential/FM-demod
else if (strcmp(*argv, "--iq2") == 0) { option_iq = 2; option_b = 1; }
else if (strcmp(*argv, "--iq3") == 0) { option_iq = 3; option_b = 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;
if (option_ecc) {
rs_init_RS255();
}
if (!rawin) {
i = read_wav_header(fp);
if (i) {
fclose(fp);
return -1;
}
if (option_iq)
{
if (channels < 2) return -1;
LOG2N = 0;
M_DFT = samples_per_bit*256+0.5;
while ( (1 << LOG2N) < M_DFT ) LOG2N++;
LOG2N++;
N_DFT = (1 << LOG2N);
init_dft();
N_IQBUF = M_DFT + samples_per_bit*(64+16);
raw_iqbuf = calloc(N_IQBUF+1, sizeof(complex double)); if (raw_iqbuf == NULL) return -1;
rot_iqbuf = calloc(N_IQBUF+1, sizeof(complex double)); if (rot_iqbuf == NULL) return -1;
len_sq = samples_per_bit*8;
}
if (option_b)
{
Nvar = 32*samples_per_bit;
bufvar = (float *)calloc( Nvar+1, sizeof(float)); if (bufvar == NULL) return -1;
for (i = 0; i < Nvar; i++) bufvar[i] = 0;
}
while (!read_bits_fsk(fp, &bit, &len)) {
if (len == 0) { // reset_frame();
if (byte_count > pos_AUX) {
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;
if (header_found && option_iq) {
int buf_start = sample_count - (HEADOFS+HEADLEN+(len-i)+256)*samples_per_bit;
while (buf_start < 0) buf_start += N_IQBUF;
for (j = 0; j < M_DFT; j++) {
xn[j] = Hann[j]*raw_iqbuf[(buf_start+j) % N_IQBUF]; // Hann[j]*buffer[(ptr + j + 1)%N];
}
dft2();
db_power(Z, db);
df = bin2freq(max_bin());
#if defined(DBG) || defined(DBG1)
fprintf(stderr, "fq-ofs: %+.1f Hz\n", df);
#endif
// if |df|<eps, +-2400Hz dominant
if (fabs(df) > 1000.0) df = 0.0;
sample_head_start = sample_count - (HEADOFS+HEADLEN+(len-i-1))*samples_per_bit;
sample_framestart = sample_head_start + 64*samples_per_bit;
sample_posnoise = sample_framestart + sample_rate*7/8.0;
#ifdef DBG1
double phase0 = carg(rot_iqbuf[sample_head_start % N_IQBUF]);
fprintf(stderr, "%lu phase0 : %+.2f\n", sample_count, phase0/M_PI);
#endif
}
}
else {
bitbuf[bit_count] = bit;
bit_count++;
if (bit_count == 8) {
bit_count = 0;
byte = bits2byte(bitbuf);
//xframe[byte_count] = byte;
frame[byte_count] = byte ^ mask[byte_count % MASK_LEN];
byte_count++;
if (byte_count == frmlen) {
byte_count = FRAMESTART;
header_found = 0;
print_frame(frmlen);
}
}
}
}
if (header_found && option_b) {
bitstart = 1;
sumQ = 0;
Qerror_count = 0;
ft_len = frmlen;
while ( byte_count < frmlen ) {
bitQ = read_rawbit(fp, &bit); // return: zeroX/bit (oder alternativ Varianz/bit)
if ( bitQ == EOF) break;
sumQ += bitQ; // zeroX/byte
bitbuf[bit_count] = bit;
bit_count++;
if (bit_count == 8) {
bit_count = 0;
byte = bits2byte(bitbuf);
//xframe[byte_count] = byte;
frame[byte_count] = byte ^ mask[byte_count % MASK_LEN];
mu = xsum/(float)Nvar;
bvar[byte_count] = qsum/(float)Nvar - mu*mu;
if (byte_count > NDATA_LEN) { // Fehler erst ab minimaler framelen Zaehlen
//ratioQ = sumQ/samples_per_bit; // approx: bei Rauschen zeroX/byte leider nicht linear in sample_rate
//if (ratioQ > 0.7) { // sr=48k: 0.7, Schwelle, ab wann wahrscheinlich Rauschbit
if (bvar[byte_count]*2 > bvar[byte_count-300]*3) { // Var(frame)/Var(noise) ca. 1:2
Qerror_count += 1;
}
}
sumQ = 0; // Fenster fuer zeroXcount: 8 bit
byte_count++;
}
if (Qerror_count == 4 && option_len == 0) { // framelen = 320 oder 518
ft_len = byte_count;
Qerror_count += 1;
}
}
header_found = 0;
print_frame(ft_len);
byte_count = FRAMESTART;
}
}
if (option_b)
{
if (bufvar) { free(bufvar); bufvar = NULL; }
}
if (option_iq)
{
if (raw_iqbuf) { free(raw_iqbuf); raw_iqbuf = NULL; }
if (rot_iqbuf) { free(rot_iqbuf); rot_iqbuf = NULL; }
free_dft();
}
}
else //if (rawin)
{
if (rawin == 3) frameofs = 8;
else frameofs = 0;
while (1 > 0) {
pbuf = fgets(buffer_rawin, rawin*FRAME_LEN+12, fp);
if (pbuf == NULL) break;
buffer_rawin[rawin*FRAME_LEN] = '\0';
if (rawin == 2) {
buf_sp = strchr(buffer_rawin, ' ');
if (buf_sp != NULL && buf_sp-buffer_rawin < rawin*FRAME_LEN) {
buffer_rawin[buf_sp-buffer_rawin] = '\0';
}
}
len = strlen(buffer_rawin) / rawin;
if (len > pos_SondeID+10) {
for (i = 0; i < len; i++) { //%2x SCNx8=%hhx(inttypes.h)
sscanf(buffer_rawin+rawin*i, "%2hhx", frame+frameofs+i);
// wenn ohne %hhx: sscanf(buffer_rawin+rawin*i, "%2x", &byte); frame[frameofs+i] = (ui8_t)byte;
}
if (rawin == 3) {
len += frameofs;
if ((frame[NDATA_LEN-1]<<8)+frame[NDATA_LEN-2] == 0xc7ec) len = NDATA_LEN; //**//
}
print_frame(len);
}
}
}
fclose(fp);
return 0;
}
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