mirror of
https://github.com/f4exb/sdrangel.git
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390 lines
11 KiB
C++
390 lines
11 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2022 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <algorithm>
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#include <functional>
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#include "dsp/dspengine.h"
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#include "dsp/fftfactory.h"
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#include "dsp/fftengine.h"
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#include "doa2corr.h"
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std::complex<float> s2cNorm(const Sample& s)
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{
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float x = s.real() / SDR_RX_SCALEF;
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float y = s.imag() / SDR_RX_SCALEF;
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float m = sqrt(x*x + y*y);
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return std::complex<float>{x/m, y/m};
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}
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Sample sFirst(const Sample& a, const Sample& b) {
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(void) b;
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return a;
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}
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Sample sSecond(const Sample& a, const Sample& b) {
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(void) a;
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return b;
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}
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Sample sSecondInv(const Sample& a, const Sample& b) {
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(void) a;
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return Sample{-b.real(), -b.imag()};
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}
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Sample invfft2s(const std::complex<float>& a) { //!< Complex float to Sample for 1 side time correlation
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Sample s;
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s.setReal(a.real()/2.0f);
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s.setImag(a.imag()/2.0f);
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return s;
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}
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DOA2Correlator::DOA2Correlator(int fftSize) :
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m_corrType(DOA2Settings::CorrelationFFT),
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m_fftSize(fftSize)
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{
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setPhase(0);
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FFTFactory *fftFactory = DSPEngine::instance()->getFFTFactory();
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m_window.create(FFTWindow::Function::Hanning, fftSize);
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for (int i = 0; i < 2; i++) {
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m_fftSequences[i] = fftFactory->getEngine(fftSize, false, &m_fft[i]);
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}
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m_invFFTSequence = fftFactory->getEngine(fftSize, true, &m_invFFT);
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m_dataj = new std::complex<float>[2*fftSize]; // receives actual FFT result hence twice the data FFT size
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m_tcorr.resize(fftSize);
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m_xcorr.resize(fftSize);
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m_tcorrSize = fftSize;
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m_xcorrSize = fftSize;
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}
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DOA2Correlator::~DOA2Correlator()
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{
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FFTFactory *fftFactory = DSPEngine::instance()->getFFTFactory();
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fftFactory->releaseEngine(m_fftSize, true, m_invFFTSequence);
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delete[] m_dataj;
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for (int i = 0; i < 2; i++) {
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fftFactory->releaseEngine(m_fftSize, false, m_fftSequences[i]);
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}
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}
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bool DOA2Correlator::performCorr(
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const SampleVector& data0,
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unsigned int size0,
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const SampleVector& data1,
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unsigned int size1
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)
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{
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bool results = false;
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if (m_phase == 0)
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{
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switch (m_corrType)
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{
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case DOA2Settings::Correlation0:
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results = performOpCorr(data0, size0, data1, size1, sFirst);
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break;
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case DOA2Settings::Correlation1:
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results = performOpCorr(data0, size0, data1, size1, sSecond);
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break;
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case DOA2Settings::CorrelationFFT:
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results = performFFTProd(data0, size0, data1, size1);
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break;
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default:
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break;
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}
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}
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else if ((m_phase == -180) || (m_phase == 180))
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{
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if (m_corrType == DOA2Settings::CorrelationFFT)
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{
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if (size1 > m_data1p.size()) {
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m_data1p.resize(size1);
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}
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std::transform(
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data1.begin(),
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data1.begin() + size1,
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m_data1p.begin(),
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[](const Sample& s) -> Sample {
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return Sample{-s.real(), -s.imag()};
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}
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);
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}
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switch (m_corrType)
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{
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case DOA2Settings::Correlation0:
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results = performOpCorr(data0, size0, data1, size1, sFirst);
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break;
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case DOA2Settings::Correlation1:
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results = performOpCorr(data0, size0, data1, size1, sSecondInv);
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break;
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case DOA2Settings::CorrelationFFT:
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results = performFFTProd(data0, size0, m_data1p, size1);
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break;
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default:
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break;
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}
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}
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else
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{
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if (size1 > m_data1p.size()) {
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m_data1p.resize(size1);
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}
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std::transform(
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data1.begin(),
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data1.begin() + size1,
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m_data1p.begin(),
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[this](const Sample& s) -> Sample {
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Sample t;
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int64_t sx = s.real();
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int64_t sy = s.imag();
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int64_t x = sx*m_cos + sy*m_sin;
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int64_t y = sy*m_cos - sx*m_sin;
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t.setReal(x>>(SDR_RX_SAMP_SZ-1));
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t.setImag(y>>(SDR_RX_SAMP_SZ-1));
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return t;
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}
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);
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switch (m_corrType)
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{
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case DOA2Settings::Correlation0:
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results = performOpCorr(data0, size0, m_data1p, size1, sFirst);
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break;
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case DOA2Settings::Correlation1:
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results = performOpCorr(data0, size0, m_data1p, size1, sSecond);
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break;
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case DOA2Settings::CorrelationFFT:
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results = performFFTProd(data0, size0, m_data1p, size1);
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break;
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default:
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break;
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}
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}
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return results;
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}
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bool DOA2Correlator::performOpCorr(
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const SampleVector& data0,
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unsigned int size0,
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const SampleVector& data1,
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unsigned int size1,
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Sample sampleOp(const Sample& a, const Sample& b)
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)
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{
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unsigned int size = std::min(size0, size1);
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adjustTCorrSize(size);
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adjustXCorrSize(size);
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std::transform(
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data0.begin(),
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data0.begin() + size,
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data1.begin(),
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m_tcorr.begin(),
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sampleOp
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);
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m_processed = size;
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m_remaining[0] = size0 - size;
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m_remaining[1] = size1 - size;
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return true;
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}
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bool DOA2Correlator::performFFTProd(
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const SampleVector& data0,
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unsigned int size0,
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const SampleVector& data1,
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unsigned int size1
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)
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{
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unsigned int size = std::min(size0, size1);
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int nfft = 0;
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SampleVector::const_iterator begin0 = data0.begin();
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SampleVector::const_iterator begin1 = data1.begin();
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adjustTCorrSize(size);
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adjustXCorrSize(size);
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while (size >= m_fftSize)
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{
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// FFT[0]
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std::transform(
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begin0,
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begin0 + m_fftSize,
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m_fft[0]->in(),
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s2cNorm
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);
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m_window.apply(m_fft[0]->in());
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m_fft[0]->transform();
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// FFT[1]
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std::transform(
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begin1,
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begin1 + m_fftSize,
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m_fft[1]->in(),
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s2cNorm
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);
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m_window.apply(m_fft[1]->in());
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m_fft[1]->transform();
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// conjugate FFT[1]
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std::transform(
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m_fft[1]->out(),
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m_fft[1]->out() + m_fftSize,
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m_dataj,
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[](const std::complex<float>& c) -> std::complex<float> {
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return std::conj(c);
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}
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);
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// product of FFT[1]* with FFT[0] and store in both results
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std::transform(
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m_fft[0]->out(),
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m_fft[0]->out() + m_fftSize,
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m_dataj,
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m_invFFT->in(),
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[this](std::complex<float>& a, const std::complex<float>& b) -> std::complex<float> {
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return (a*b);
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}
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);
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// copy to complex vector for DOA with re-orderong
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std::copy(
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m_invFFT->in(),
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m_invFFT->in() + m_fftSize/2,
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m_xcorr.begin() + nfft*m_fftSize + m_fftSize/2
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);
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std::copy(
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m_invFFT->in() + m_fftSize/2,
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m_invFFT->in() + m_fftSize,
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m_xcorr.begin() + nfft*m_fftSize
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);
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// convert and scale to FFT size for scope time domain display
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std::transform(
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m_xcorr.begin() + nfft*m_fftSize,
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m_xcorr.begin() + nfft*m_fftSize + m_fftSize,
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m_tcorr.begin() + nfft*m_fftSize,
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[](const std::complex<float>& a) -> Sample {
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Sample s;
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s.setReal(a.real()/2.0f);
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s.setImag(a.imag()/2.0f);
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return s;
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}
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);
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// copy product to time domain - re-order, convert and scale to FFT size
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// std::transform(
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// m_invFFT->in(),
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// m_invFFT->in() + m_fftSize/2,
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// m_tcorr.begin() + nfft*m_fftSize + m_fftSize/2,
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// [](const std::complex<float>& a) -> Sample {
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// Sample s;
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// s.setReal(a.real()/2.0f);
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// s.setImag(a.imag()/2.0f);
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// return s;
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// }
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// );
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// std::transform(
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// m_invFFT->in() + m_fftSize/2,
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// m_invFFT->in() + m_fftSize,
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// m_tcorr.begin() + nfft*m_fftSize,
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// [](const std::complex<float>& a) -> Sample {
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// Sample s;
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// s.setReal(a.real()/2.0f);
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// s.setImag(a.imag()/2.0f);
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// return s;
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// }
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// );
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size -= m_fftSize;
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begin0 += m_fftSize;
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begin1 += m_fftSize;
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nfft++;
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}
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// update the samples counters
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m_processed = nfft*m_fftSize;
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m_remaining[0] = size0 - nfft*m_fftSize;
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m_remaining[1] = size1 - nfft*m_fftSize;
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return nfft > 0;
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}
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void DOA2Correlator::adjustTCorrSize(int size)
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{
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int nFFTSize = (size/m_fftSize)*m_fftSize;
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if (nFFTSize > m_tcorrSize)
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{
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m_tcorr.resize(nFFTSize);
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m_tcorrSize = nFFTSize;
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}
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}
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void DOA2Correlator::adjustXCorrSize(int size)
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{
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int nFFTSize = (size/m_fftSize)*m_fftSize;
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if (nFFTSize > m_xcorrSize)
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{
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m_xcorr.resize(nFFTSize);
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m_xcorrSize = nFFTSize;
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}
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}
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void DOA2Correlator::setPhase(int phase)
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{
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m_phase = phase;
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if (phase == 0)
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{
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m_sin = 0;
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m_cos = 1<<(SDR_RX_SAMP_SZ-1);
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}
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else if (phase == 90)
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{
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m_sin = 1<<(SDR_RX_SAMP_SZ-1);
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m_cos = 0;
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}
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else if (phase == -90)
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{
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m_sin = -(1<<(SDR_RX_SAMP_SZ-1));
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m_cos = 0;
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}
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else if ((phase == -180) || (phase == 180))
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{
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m_sin = 0;
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m_cos = -(1<<(SDR_RX_SAMP_SZ-1));
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}
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else
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{
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m_phase = phase % 180;
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double d_sin = sin(M_PI*(m_phase/180.0)) * (1<<(SDR_RX_SAMP_SZ-1));
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double d_cos = cos(M_PI*(m_phase/180.0)) * (1<<(SDR_RX_SAMP_SZ-1));
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m_sin = d_sin;
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m_cos = d_cos;
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}
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}
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