kopia lustrzana https://github.com/rs1729/RS
dft_detect: option -d2, detect twice
Zilog80
rodzic
81eeb0f84c
commit
08af407e24
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@ -0,0 +1,101 @@
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## detect radiosonde type
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#### Files
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* `dft_detect.c`
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#### Compile
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`gcc dft_detect.c -lm -o dft_detect`
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#### Usage
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`./dft_detect [options] <file>` <br />
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options:<br />
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`--IQ <fq>` : IQ data input, where `<fq>` is the relative frequency in `-0.5..0.5` <br />
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`-v` : sample count <br />
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`-c` : continuous output<br />
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`-t <sec>` : time limit <br />
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(input `<file>` can be `stdin`)
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<br />
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FM data:<br />
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`./dft_detect <fm_audio.wav>` <br />
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IQ data:<br />
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`./dft_detect --IQ <fq> <iq_data.wav>` <br />
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For IQ data (i.e. 2 channels) it is possible to read raw data (without wav header): <br />
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`./dft_detect --IQ <fq> - <sr> <bs> <iq_data.raw>` <br />
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where <br />
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`<sr>` : sample rate <br />
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`<bs>=8,16,32` : bits per (real) sample (u8, s16 or f32)
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`dft_detect` stops, if a (potential) radiosonde signal is detected, or if a time limit is set with option `-t`. <br />
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With option `-c` detection is continued, but a time limit can be set with `-t`.
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Output is of the form `<TYPE>: <score>` where the correlation score is a normalized value in `-1..+1`.
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#### Examples
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Ex.1
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```
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$ ./dft_detect fm_audio.wav
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sample_rate: 48000
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bits : 8
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channels : 1
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RS41: 0.9885
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```
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Ex.2
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```
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$ ./dft_detect -c fm_audio.wav 2>/dev/null
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RS41: 0.9885
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RS41: 0.9851
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RS41: 0.9784
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RS41: 0.9869
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RS41: 0.9845
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RS41: 0.9828
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RS41: 0.9814
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RS41: 0.9821
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RS41: 0.9823
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RS41: 0.9882
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[...]
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```
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Ex.3
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```
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$ ./dft_detect -c -t 4 fm_audio.wav 2>/dev/null
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RS41: 0.9885
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RS41: 0.9851
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RS41: 0.9784
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RS41: 0.9869
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RS41: 0.9845
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```
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Ex.4
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```
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$ ./dft_detect -v -c -t 2 fm_audio.wav 2>/dev/null
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sample: 39801
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RS41: 0.9885
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sample: 87824
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RS41: 0.9851
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sample: 135831
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RS41: 0.9784
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```
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Ex.5<br />
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Some radiosonde types have similar signals, false detection is possible.
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```
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$ ./dft_detect -c -t 4 fm_meisei.wav 2>/dev/null
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MEISEI: 0.9802
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MRZ: -0.9720
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MEISEI: 0.9829
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```
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Here a Meisei radiosonde seems to be more likely.
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Ex.6<br />
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Confirmed detection (two hits):
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```
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$ ./dft_detect -d2 -t 4 fm_meisei.wav 2>/dev/null
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MEISEI: 0.9829
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```
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@ -32,6 +32,7 @@ static int option_verbose = 0, // ausfuehrliche Anzeige
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option_dc = 0,
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option_silent = 0,
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option_cont = 0,
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option_d2 = 0,
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option_pcmraw = 0,
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option_singleLpIQ = 0,
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wavloaded = 0;
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@ -178,6 +179,23 @@ static int idx_MTS01 = -1,
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idx_IMET1AB = -1;
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static int rs_detect2[Nrs];
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static int rs_d2() {
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int tn = 0;
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for (tn = 0; tn < Nrs; tn++) {
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if ( rs_detect2[tn] > 1 ) break;
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}
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return tn;
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}
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static int reset_d2() {
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int n = 0;
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for (n = 0; n < Nrs; n++) rs_detect2[n] = 0;
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return 0;
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}
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/*
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// m10-false-positive:
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// m10-preamble similar to rs41-preamble, parts of rs92/imet1ab, imet1ab; diffs:
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@ -1302,6 +1320,8 @@ int main(int argc, char **argv) {
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int j_max;
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float mv_max;
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int d2_tn = Nrs;
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#ifdef CYGWIN
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_setmode(fileno(stdin), _O_BINARY); // _setmode(_fileno(stdin), _O_BINARY);
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@ -1364,6 +1384,9 @@ int main(int argc, char **argv) {
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if (*argv) tl = atof(*argv);
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else return -50;
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}
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else if ( (strcmp(*argv, "-d2") == 0) ) {
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option_d2 = 1;
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}
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else if ( (strcmp(*argv, "--ch2") == 0) ) { wav_channel = 1; } // right channel (default: 0=left)
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else if ( (strcmp(*argv, "--ths") == 0) ) {
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++argv;
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@ -1397,6 +1420,9 @@ int main(int argc, char **argv) {
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}
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if (!wavloaded) fp = stdin;
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if (option_d2) {
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option_cont = 0;
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}
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if (option_pcmraw == 0) {
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j = read_wav_header(fp, wav_channel);
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@ -1547,16 +1573,23 @@ int main(int argc, char **argv) {
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if (header_found) {
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if (!option_silent && (mv[j] > rs_hdr[j].thres || mv[j] < -rs_hdr[j].thres)) {
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if (option_verbose) fprintf(stdout, "sample: %d\n", mv_pos[j]);
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fprintf(stdout, "%s: %.4f", rs_hdr[j].type, mv[j]);
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if (option_dc && option_iq) {
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fprintf(stdout, " , %+.1fHz", rs_hdr[j].df*sr_base);
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if (option_verbose) {
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fprintf(stdout, " [ fq-ofs: %+.6f", rs_hdr[j].df);
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fprintf(stdout, " = %+.1fHz ]", rs_hdr[j].df*sr_base);
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}
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if (option_d2) {
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rs_detect2[j] += 1;
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d2_tn = rs_d2();
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if ( d2_tn == Nrs ) header_found = 0;
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}
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if ( !option_d2 || j == d2_tn ) {
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if (option_verbose) fprintf(stdout, "sample: %d\n", mv_pos[j]);
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fprintf(stdout, "%s: %.4f", rs_hdr[j].type, mv[j]);
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if (option_dc && option_iq) {
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fprintf(stdout, " , %+.1fHz", rs_hdr[j].df*sr_base);
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if (option_verbose) {
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fprintf(stdout, " [ fq-ofs: %+.6f", rs_hdr[j].df);
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fprintf(stdout, " = %+.1fHz ]", rs_hdr[j].df*sr_base);
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}
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}
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fprintf(stdout, "\n");
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}
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fprintf(stdout, "\n");
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}
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// if ((j < 3) && mv[j] < 0) header_found = -1;
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@ -1570,7 +1603,7 @@ int main(int argc, char **argv) {
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}
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}
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if (header_found && !option_cont) break;
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if (header_found && !option_cont || d2_tn < Nrs) break;
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header_found = 0;
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for (j = 0; j < Nrs; j++) mv[j] = 0.0;
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}
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