kopia lustrzana https://github.com/Guenael/rtlsdr-wsprd
WIP chore: wsprd lib update part4
Guenael
rodzic
92d3e34213
commit
7dc970ee74
224
wsprd/wsprd.c
224
wsprd/wsprd.c
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@ -90,15 +90,15 @@ void sync_and_demodulate(float *id,
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float *qd,
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long np,
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unsigned char *symbols,
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float *f1,
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float *freq,
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int ifmin,
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int ifmax,
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float fstep,
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int *shift1,
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int *shift,
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int lagmin,
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int lagmax,
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int lagstep,
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float *drift1,
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float *drift,
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int symfac,
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float *sync,
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int mode) {
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@ -126,22 +126,22 @@ void sync_and_demodulate(float *id,
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ifmax = 0;
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fstep = 0.0;
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} else if (mode == 1) {
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lagmin = *shift1;
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lagmax = *shift1;
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lagmin = *shift;
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lagmax = *shift;
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} else if (mode == 2) {
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lagmin = *shift1;
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lagmax = *shift1;
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lagmin = *shift;
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lagmax = *shift;
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ifmin = 0;
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ifmax = 0;
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}
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for (int ifreq = ifmin; ifreq <= ifmax; ifreq++) {
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float f0 = *f1 + ifreq * fstep;
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float f0 = *freq + ifreq * fstep;
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for (int lag = lagmin; lag <= lagmax; lag = lag + lagstep) {
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float ss = 0.0;
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float totp = 0.0;
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for (int i = 0; i < NSYM; i++) {
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float fp = f0 + (*drift1 / 2.0) * ((float)i - (float)NBITS) / (float)NBITS;
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float fp = f0 + (*drift / 2.0) * ((float)i - (float)NBITS) / (float)NBITS;
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if (i == 0 || (fp != fplast)) { // only calculate sin/cos if necessary
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float dphi0 = TWOPIDT * (fp - DF15);
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float cdphi0 = cosf(dphi0);
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@ -223,8 +223,8 @@ void sync_and_demodulate(float *id,
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if (mode <= 1) { // Send best params back to caller
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*sync = syncmax;
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*shift1 = best_shift;
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*f1 = fbest;
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*shift = best_shift;
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*freq = fbest;
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return;
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}
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@ -252,14 +252,14 @@ void subtract_signal(float *id,
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float *qd,
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long np,
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float f0,
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int shift0,
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float drift0,
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int shift,
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float drift,
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unsigned char *channel_symbols) {
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float c0[NSPERSYM], s0[NSPERSYM];
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for (int i = 0; i < NSYM; i++) {
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float fp = f0 + ((float)drift0 / 2.0) * ((float)i - (float)NBITS) / (float)NBITS;
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float fp = f0 + ((float)drift / 2.0) * ((float)i - (float)NBITS) / (float)NBITS;
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float dphi = TWOPIDT * (fp + ((float)channel_symbols[i] - 1.5) * DF);
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float cdphi = cosf(dphi);
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@ -277,7 +277,7 @@ void subtract_signal(float *id,
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float q0 = 0.0;
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for (int j = 0; j < NSPERSYM; j++) {
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int k = shift0 + i * NSPERSYM + j;
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int k = shift + i * NSPERSYM + j;
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if ((k > 0) & (k < np)) {
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i0 = i0 + id[k] * c0[j] + qd[k] * s0[j];
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q0 = q0 - id[k] * s0[j] + qd[k] * c0[j];
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@ -289,7 +289,7 @@ void subtract_signal(float *id,
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q0 = q0 / (float)NSPERSYM;
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for (int j = 0; j < NSPERSYM; j++) {
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int k = shift0 + i * NSPERSYM + j;
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int k = shift + i * NSPERSYM + j;
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if ((k > 0) & (k < np)) {
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id[k] = id[k] - (i0 * c0[j] - q0 * s0[j]);
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qd[k] = qd[k] - (q0 * c0[j] + i0 * s0[j]);
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@ -305,8 +305,8 @@ void subtract_signal2(float *id,
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float *qd,
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long np,
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float f0,
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int shift0,
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float drift0,
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int shift,
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float drift,
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unsigned char *channel_symbols) {
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float phi = 0.0;
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@ -328,7 +328,7 @@ void subtract_signal2(float *id,
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for (int i = 0; i < NSYM; i++) {
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float cs = (float)channel_symbols[i];
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float dphi = TWOPIDT * (f0 + (drift0 / 2.0) * ((float)i - (float)NSYM / 2.0) / ((float)NSYM / 2.0) + (cs - 1.5) * DF);
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float dphi = TWOPIDT * (f0 + (drift / 2.0) * ((float)i - (float)NSYM / 2.0) / ((float)NSYM / 2.0) + (cs - 1.5) * DF);
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for (int j = 0; j < NSPERSYM; j++) {
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int ii = NSPERSYM * i + j;
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@ -357,11 +357,11 @@ void subtract_signal2(float *id,
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// s(t) * conjugate(r(t))
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// beginning of first symbol in reference signal is at i=0
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// beginning of first symbol in received data is at shift0.
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// beginning of first symbol in received data is at shift value.
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// filter transient lasts nfilt samples
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// leave nfilt zeros as a pad at the beginning of the unfiltered reference signal
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for (int i = 0; i < NSYM * NSPERSYM; i++) {
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int k = shift0 + i;
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int k = shift + i;
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if ((k > 0) && (k < np)) {
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ci[i + nfilt] = id[k] * refi[i] + qd[k] * refq[i];
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cq[i + nfilt] = qd[k] * refi[i] - id[k] * refq[i];
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@ -381,7 +381,7 @@ void subtract_signal2(float *id,
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// subtract c(t)*r(t) here
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// (ci+j*cq)(refi+j*refq)=(ci*refi-cq*refq)+j(ci*refq+cq*refi)
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// beginning of first symbol in reference signal is at i=nfilt
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// beginning of first symbol in received data is at shift0.
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// beginning of first symbol in received data is at shift value.
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for (int i = 0; i < NSYM * NSPERSYM; i++) {
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if (i < nfilt / 2) { // take care of the end effect (LPF step response) here
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norm = partialsum[nfilt / 2 + i];
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@ -390,7 +390,7 @@ void subtract_signal2(float *id,
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} else {
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norm = 1.0;
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}
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int k = shift0 + i;
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int k = shift + i;
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int j = i + nfilt;
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if ((k > 0) && (k < np)) {
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id[k] = id[k] - (cfi[j] * refi[i] - cfq[j] * refq[i]) / norm;
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@ -402,27 +402,23 @@ void subtract_signal2(float *id,
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int wspr_decode(float *idat,
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float *qdat,
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int samples,
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struct decoder_options options,
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struct decoder_results *decodes,
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int *n_results) {
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uint8_t symbols[NBITS * 2] = {0};
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uint8_t decdata[(NBITS + 7) / 8] = {0};
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int8_t message[12] = {0};
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float *qdat,
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int samples,
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struct decoder_options options,
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struct decoder_results *decodes,
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int *n_results) {
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/* Parameters used for performance-tuning */
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float minsync1 = 0.10; // First sync limit
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float minsync2 = 0.12; // Second sync limit
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int iifac = 3; // Step size in final DT peakup
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int symfac = 50; // Soft-symbol normalizing factor
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int maxdrift = 4; // Maximum (+/-) drift
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float minrms = 52.0 * (symfac / 64.0); // Final test for plausible decoding
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int delta = 60; // Fano threshold step
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int maxcycles = 10000; // Fano timeout limit
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float fmin = -110.0;
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float fmax = 110.0;
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float minsync1 = 0.10; // First sync limit
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float minsync2 = 0.12; // Second sync limit
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int iifac = 3; // Step size in final DT peakup
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int symfac = 50; // Soft-symbol normalizing factor
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int maxdrift = 4; // Maximum (+/-) drift
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float minrms = 52.0 * (symfac / 64.0); // Final test for plausible decoding
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int delta = 60; // Fano threshold step
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int maxcycles = 10000; // Fano timeout limit
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float fmin = -110.0;
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float fmax = 110.0;
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/* Search live parameters */
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float fstep;
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@ -439,22 +435,22 @@ int wspr_decode(float *idat,
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/* CPU usage stats */
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uint32_t metric, cycles, maxnp;
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/* Candidates */
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/* Candidates properties */
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struct cand candidates[200];
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float freq0[200], freq1 = 0.0;
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float drift0[200], drift1 = 0.0;
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float sync0[200], sync1 = 0.0;
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float snr0[200];
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int shift0[200], shift1 = 0;
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/* Decoded candidate */
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uint8_t symbols[NBITS * 2] = {0};
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uint8_t decdata[(NBITS + 7) / 8] = {0};
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int8_t message[12] = {0};
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/* Results */
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float allfreqs[100] = {0};
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char allcalls[100][13] = {0};
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char callsign[13] = {0};
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char call_loc_pow[23] = {0};
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char call[13] = {0};
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char loc[7] = {0};
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char pwr[3] = {0};
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float allfreqs[100] = {0};
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char allcalls[100][13] = {0};
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/* Setup metric table */
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int32_t mettab[2][256];
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@ -588,20 +584,22 @@ int wspr_decode(float *idat,
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// Find all local maxima in smoothed spectrum.
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for (int i = 0; i < 200; i++) {
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freq0[i] = 0.0;
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snr0[i] = 0.0;
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drift0[i] = 0.0;
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shift0[i] = 0;
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sync0[i] = 0.0;
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candidates[i].freq = 0.0;
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candidates[i].snr = 0.0;
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candidates[i].drift = 0.0;
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candidates[i].shift = 0;
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candidates[i].sync = 0.0;
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}
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int32_t npk = 0;
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int npk = 0;
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unsigned char candidate;
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for (int j = 1; j < 410; j++) {
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if ((smspec[j] > smspec[j - 1]) &&
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(smspec[j] > smspec[j + 1]) &&
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(npk < 200)) {
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freq0[npk] = (j - 205) * (DF / 2.0);
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snr0[npk] = 10.0 * log10f(smspec[j]) - snr_scaling_factor;
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candidate = (smspec[j] > smspec[j - 1]) &&
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(smspec[j] > smspec[j + 1]) &&
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(npk < 200);
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if (candidate) {
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candidates[npk].freq = (j - 205) * (DF / 2.0);
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candidates[npk].snr = 10.0 * log10f(smspec[j]) - snr_scaling_factor;
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npk++;
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}
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}
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@ -609,25 +607,21 @@ int wspr_decode(float *idat,
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// Don't waste time on signals outside of the range [fmin,fmax].
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int i = 0;
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for (int j = 0; j < npk; j++) {
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if (freq0[j] >= fmin && freq0[j] <= fmax) {
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freq0[i] = freq0[j];
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snr0[i] = snr0[j];
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if (candidates[j].freq >= fmin && candidates[j].freq <= fmax) {
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candidates[i] = candidates[j];
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i++;
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}
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}
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npk = i;
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// bubble sort on snr, bringing freq along for the ride
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float tmp;
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struct cand tmp;
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for (int pass = 1; pass <= npk - 1; pass++) {
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for (int k = 0; k < npk - pass; k++) {
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if (snr0[k] < snr0[k + 1]) {
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tmp = snr0[k];
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snr0[k] = snr0[k + 1];
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snr0[k + 1] = tmp;
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tmp = freq0[k];
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freq0[k] = freq0[k + 1];
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freq0[k + 1] = tmp;
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if (candidates[k].snr < candidates[k + 1].snr) {
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tmp = candidates[k];
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candidates[k] = candidates[k + 1];
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candidates[k + 1] = tmp;
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}
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}
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}
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@ -646,8 +640,8 @@ int wspr_decode(float *idat,
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signal vector.
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*/
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for (int j = 0; j < npk; j++) { // For each candidate...
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float smax = -1e30;
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int if0 = freq0[j] / (DF / 2.0) + NSPERSYM;
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float sync, sync_max = -1e30;
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int if0 = candidates[j].freq / (DF / 2.0) + NSPERSYM;
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for (int ifr = if0 - 1; ifr <= if0 + 1; ifr++) { // Freq search
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for (int k0 = -10; k0 < 22; k0++) { // Time search
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for (int idrift = -maxdrift; idrift <= maxdrift; idrift++) { // Drift search
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@ -664,15 +658,15 @@ int wspr_decode(float *idat,
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ss = ss + (2 * pr3vector[k] - 1) * ((p1 + p3) - (p0 + p2));
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pow = pow + p0 + p1 + p2 + p3;
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sync1 = ss / pow;
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sync = ss / pow;
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}
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}
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if (sync1 > smax) { // Save coarse parameters
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smax = sync1;
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shift0[j] = 128 * (k0 + 1);
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drift0[j] = idrift;
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freq0[j] = (ifr - NSPERSYM) * (DF / 2.0);
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sync0[j] = sync1;
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if (sync > sync_max) { // Save coarse parameters
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sync_max = sync;
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candidates[j].shift = 128 * (k0 + 1);
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candidates[j].drift = idrift;
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candidates[j].freq = (ifr - NSPERSYM) * (DF / 2.0);
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candidates[j].sync = sync;
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}
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}
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}
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@ -697,38 +691,42 @@ int wspr_decode(float *idat,
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*/
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for (int j = 0; j < npk; j++) {
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memset(symbols, 0, sizeof(char) * NBITS * 2);
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memset(callsign, 0, sizeof(char) * 13);
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memset(call_loc_pow, 0, sizeof(char) * 23);
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memset(call, 0, sizeof(char) * 13);
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memset(loc, 0, sizeof(char) * 7);
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memset(pwr, 0, sizeof(char) * 3);
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freq1 = freq0[j];
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drift1 = drift0[j];
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shift1 = shift0[j];
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sync1 = sync0[j];
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float freq = candidates[j].freq;
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float drift = candidates[j].drift;
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float sync = candidates[j].sync;
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int shift = candidates[j].shift;
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// Coarse-grid search for best sync lag (mode 0)
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// Search for best sync lag (mode 0)
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fstep = 0.0;
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ifmin = 0;
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ifmax = 0;
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lagmin = shift1 - 128;
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lagmax = shift1 + 128;
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lagmin = shift - 128;
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lagmax = shift + 128;
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lagstep = 8;
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if (options.quickmode)
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lagstep = 16;
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sync_and_demodulate(idat, qdat, samples, symbols, &freq1, ifmin, ifmax, fstep, &shift1,
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lagmin, lagmax, lagstep, &drift1, symfac, &sync1, 0);
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sync_and_demodulate(idat, qdat, samples, symbols, &freq, ifmin, ifmax, fstep, &shift,
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lagmin, lagmax, lagstep, &drift, symfac, &sync, 0);
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// Coarse-grid search for frequency peak (mode 1)
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// Search for frequency peak (mode 1)
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fstep = 0.1;
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ifmin = -2;
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ifmax = 2;
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sync_and_demodulate(idat, qdat, samples, symbols, &freq1, ifmin, ifmax, fstep, &shift1,
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lagmin, lagmax, lagstep, &drift1, symfac, &sync1, 1);
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sync_and_demodulate(idat, qdat, samples, symbols, &freq, ifmin, ifmax, fstep, &shift,
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lagmin, lagmax, lagstep, &drift, symfac, &sync, 1);
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if (sync1 > minsync1) {
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candidates[j].freq = freq;
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candidates[j].shift = shift;
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candidates[j].drift = drift;
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candidates[j].sync = sync;
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if (sync > minsync1) {
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worth_a_try = 1;
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} else {
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worth_a_try = 0;
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@ -740,12 +738,12 @@ int wspr_decode(float *idat,
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ii = (idt + 1) / 2;
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if (idt % 2 == 1) ii = -ii;
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ii = iifac * ii;
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int jiggered_shift = shift1 + ii;
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int jiggered_shift = shift + ii;
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// Use mode 2 to get soft-decision symbols
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sync_and_demodulate(idat, qdat, samples, symbols, &freq1, ifmin, ifmax, fstep,
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&jiggered_shift, lagmin, lagmax, lagstep, &drift1, symfac,
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&sync1, 2);
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sync_and_demodulate(idat, qdat, samples, symbols, &freq, ifmin, ifmax, fstep,
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&jiggered_shift, lagmin, lagmax, lagstep, &drift, symfac,
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&sync, 2);
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float sq = 0.0;
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for (i = 0; i < NSYM; i++) {
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float y = (float)symbols[i] - 128.0;
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@ -753,13 +751,14 @@ int wspr_decode(float *idat,
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|||
}
|
||||
float rms = sqrtf(sq / (float)NSYM);
|
||||
|
||||
if ((sync1 > minsync2) && (rms > minrms)) {
|
||||
if ((sync > minsync2) && (rms > minrms)) {
|
||||
deinterleave(symbols);
|
||||
not_decoded = fano(&metric, &cycles, &maxnp, decdata, symbols, NBITS,
|
||||
mettab, delta, maxcycles);
|
||||
}
|
||||
idt++;
|
||||
if (options.quickmode) break;
|
||||
if (options.quickmode)
|
||||
break;
|
||||
}
|
||||
|
||||
if (worth_a_try && !not_decoded) {
|
||||
|
|
@ -778,9 +777,8 @@ int wspr_decode(float *idat,
|
|||
if (options.subtraction && (ipass == 0) && !noprint) {
|
||||
unsigned char channel_symbols[NSYM];
|
||||
|
||||
//if (get_wspr_channel_symbols(call_loc_pow, hashtab, channel_symbols)) {
|
||||
if (get_wspr_channel_symbols(call_loc_pow, hashtab, loctab, channel_symbols)) {
|
||||
subtract_signal2(idat, qdat, samples, freq1, shift1, drift1, channel_symbols);
|
||||
subtract_signal2(idat, qdat, samples, freq, shift, drift, channel_symbols);
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
|
|
@ -789,24 +787,23 @@ int wspr_decode(float *idat,
|
|||
// Remove dupes (same callsign and freq within 3 Hz)
|
||||
int32_t dupe = 0;
|
||||
for (i = 0; i < uniques; i++) {
|
||||
if (!strcmp(callsign, allcalls[i]) && (fabs(freq1 - allfreqs[i]) < 3.0))
|
||||
if (!strcmp(callsign, allcalls[i]) && (fabs(freq - allfreqs[i]) < 3.0))
|
||||
dupe = 1;
|
||||
}
|
||||
|
||||
if (!dupe) {
|
||||
strcpy(allcalls[uniques], callsign);
|
||||
allfreqs[uniques] = freq1;
|
||||
allfreqs[uniques] = freq;
|
||||
uniques++;
|
||||
|
||||
double dialfreq = (double)options.freq / 1e6;
|
||||
double freq_print = dialfreq + (1500.0 + freq1) / 1e6;
|
||||
float dt_print = shift1 * DT - 2.0;
|
||||
double freq_print = dialfreq + (1500.0 + freq) / 1e6;
|
||||
|
||||
decodes[uniques - 1].sync = sync1;
|
||||
decodes[uniques - 1].snr = snr0[j];
|
||||
decodes[uniques - 1].dt = dt_print;
|
||||
decodes[uniques - 1].sync = candidates[j].sync;
|
||||
decodes[uniques - 1].snr = candidates[j].snr;
|
||||
decodes[uniques - 1].dt = shift * DT - 2.0;
|
||||
decodes[uniques - 1].freq = freq_print;
|
||||
decodes[uniques - 1].drift = drift1;
|
||||
decodes[uniques - 1].drift = drift;
|
||||
decodes[uniques - 1].cycles = cycles;
|
||||
decodes[uniques - 1].jitter = ii;
|
||||
strcpy(decodes[uniques - 1].message, call_loc_pow);
|
||||
|
|
@ -818,20 +815,19 @@ int wspr_decode(float *idat,
|
|||
}
|
||||
}
|
||||
|
||||
// sort the result
|
||||
/* Sort the result */
|
||||
struct decoder_results temp;
|
||||
for (int j = 1; j <= uniques - 1; j++) {
|
||||
for (int k = 0; k < uniques - j; k++) {
|
||||
if (decodes[k].snr < decodes[k + 1].snr) {
|
||||
temp = decodes[k];
|
||||
decodes[k] = decodes[k + 1];
|
||||
;
|
||||
decodes[k + 1] = temp;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Return number of spots to the calling fct
|
||||
/* Return number of spots to the calling fct */
|
||||
*n_results = uniques;
|
||||
|
||||
fftwf_free(fftin);
|
||||
|
|
|
|||
|
|
@ -70,15 +70,15 @@ void sync_and_demodulate(float *id,
|
|||
float *qd,
|
||||
long np,
|
||||
unsigned char *symbols,
|
||||
float *f1,
|
||||
float *freq,
|
||||
int ifmin,
|
||||
int ifmax,
|
||||
float fstep,
|
||||
int *shift1,
|
||||
int *shift,
|
||||
int lagmin,
|
||||
int lagmax,
|
||||
int lagstep,
|
||||
float *drift1,
|
||||
float *drift,
|
||||
int symfac,
|
||||
float *sync,
|
||||
int mode);
|
||||
|
|
@ -86,15 +86,15 @@ void subtract_signal(float *id,
|
|||
float *qd,
|
||||
long np,
|
||||
float f0,
|
||||
int shift0,
|
||||
float drift0,
|
||||
int shift,
|
||||
float drift,
|
||||
unsigned char *channel_symbols);
|
||||
void subtract_signal2(float *id,
|
||||
float *qd,
|
||||
long np,
|
||||
float f0,
|
||||
int shift0,
|
||||
float drift0,
|
||||
int shift,
|
||||
float drift,
|
||||
unsigned char *channel_symbols);
|
||||
int wspr_decode(float *idat,
|
||||
float *qdat,
|
||||
|
|
@ -102,3 +102,4 @@ int wspr_decode(float *idat,
|
|||
struct decoder_options options,
|
||||
struct decoder_results *decodes,
|
||||
int *n_results);
|
||||
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue