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305 lines
11 KiB
C++
305 lines
11 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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// Copyright (C) 2021 Jon Beniston, M7RCE //
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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 <QDebug>
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#include "dsp/dspengine.h"
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#include "radioastronomy.h"
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#include "radioastronomysink.h"
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RadioAstronomySink::RadioAstronomySink(RadioAstronomy *aisDemod) :
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m_radioAstronomy(aisDemod),
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m_channelSampleRate(1000000),
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m_channelFrequencyOffset(0),
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m_fftSequence(-1),
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m_fft(nullptr),
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m_fftCounter(0),
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m_fftSum(nullptr),
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m_fftTemp(nullptr),
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m_fftSumCount(0),
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m_enabled(false),
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m_cal(false),
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m_magsqSum(0.0f),
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m_magsqPeak(0.0f),
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m_magsqCount(0),
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m_messageQueueToChannel(nullptr)
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{
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m_magsq = 0.0;
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applySettings(m_settings, true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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}
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RadioAstronomySink::~RadioAstronomySink()
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{
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delete[] m_fftSum;
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delete[] m_fftTemp;
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}
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void RadioAstronomySink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
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{
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Complex ci;
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for (SampleVector::const_iterator it = begin; it != end; ++it)
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{
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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if (m_interpolatorDistance < 1.0f) // interpolate
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{
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while (!m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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else // decimate
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{
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if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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}
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}
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void RadioAstronomySink::processOneSample(Complex &ci)
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{
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// Calculate power
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double magsqRaw = ci.real()*ci.real() + ci.imag()*ci.imag();
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double magsq = (magsqRaw / (SDR_RX_SCALED*SDR_RX_SCALED));
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// Calculate average and peak levels for level meter
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m_movingAverage(magsq);
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m_magsq = m_movingAverage.asDouble();
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m_magsqSum += magsq;
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if (magsq > m_magsqPeak)
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{
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m_magsqPeak = magsq;
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}
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m_magsqCount++;
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if (m_enabled || m_cal)
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{
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// Add to FFT input buffer
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m_fft->in()[m_fftCounter] = Complex(ci.real() / SDR_RX_SCALEF, ci.imag() / SDR_RX_SCALEF);
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m_fftCounter++;
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if (m_fftCounter >= m_settings.m_fftSize)
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{
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// Calculate FFT
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m_fftWindow.apply(m_fft->in());
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m_fft->transform();
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m_fftCounter = 0;
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// Calculate power and accumulate
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for (int i = 0; i < m_settings.m_fftSize; i++)
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{
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Complex s = m_fft->out()[i];
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Real v = s.real() * s.real() + s.imag() * s.imag();
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Real enbw = 1.0f;
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/*if (m_settings.m_fftWindow == RadioAstronomySettings::HAN && m_settings.m_fftCorrection == RadioAstronomySettings::POWER) {
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enbw = 1.5; // FIXME: Small dependence on fftSize in Matlab
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}*/
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m_fftSum[i] += v / (enbw * m_settings.m_fftSize * m_settings.m_fftSize); // Why FFT size here and not Fs?
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}
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m_fftSumCount++;
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if (m_fftSumCount >= m_settings.m_integration)
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{
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// Average
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for (int i = 0; i < m_settings.m_fftSize; i++) {
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m_fftSum[i] /= m_fftSumCount;
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}
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// Put negative frequencies first
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std::copy(m_fftSum + m_settings.m_fftSize/2, m_fftSum + m_settings.m_fftSize, m_fftTemp);
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std::copy(m_fftSum, m_fftSum + m_settings.m_fftSize/2, m_fftTemp + m_settings.m_fftSize/2);
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// Filter freqs with RFI
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if (m_filterBins.size() > 0)
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{
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// Find minimum value to use as replacement
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// Should possibly use an average of the n lowest values or something
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float minVal = std::numeric_limits<float>::max();
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for (int i = 0; i < m_settings.m_fftSize; i++) {
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minVal = std::min(minVal, m_fftTemp[i]);
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}
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for (int i = 0; i < m_filterBins.size(); i++)
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{
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int bin = m_filterBins[i];
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if (bin < m_settings.m_fftSize) {
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m_fftTemp[bin] = minVal;
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}
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}
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}
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getMessageQueueToChannel()->push(RadioAstronomy::MsgMeasurementProgress::create(100));
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if (m_cal)
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{
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// Indicate calibration complete
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if (getMessageQueueToChannel())
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{
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RadioAstronomy::MsgCalComplete *msg = RadioAstronomy::MsgCalComplete::create(m_fftTemp, m_settings.m_fftSize, QDateTime::currentDateTime(), m_hot);
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getMessageQueueToChannel()->push(msg);
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}
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// Cal complete
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m_cal = false;
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}
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else
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{
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// Send averaged FFT to channel
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if (getMessageQueueToChannel())
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{
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RadioAstronomy::MsgFFTMeasurement *msg = RadioAstronomy::MsgFFTMeasurement::create(m_fftTemp, m_settings.m_fftSize, QDateTime::currentDateTime());
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getMessageQueueToChannel()->push(msg);
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}
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m_enabled = (m_settings.m_runMode == RadioAstronomySettings::CONTINUOUS);
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if (m_enabled) {
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getMessageQueueToChannel()->push(RadioAstronomy::MsgMeasurementProgress::create(0));
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}
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}
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m_fftSumCount = 0;
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std::fill(m_fftSum, m_fftSum + m_settings.m_fftSize, 0.0f);
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}
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else
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{
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// Don't send more than ~4 updates per second
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int fftsPerSecond = m_settings.m_sampleRate / m_settings.m_fftSize;
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if ((m_fftSumCount % (fftsPerSecond/4)) == 0) {
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getMessageQueueToChannel()->push(RadioAstronomy::MsgMeasurementProgress::create(100 * m_fftSumCount / m_settings.m_integration));
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}
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}
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}
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}
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}
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void RadioAstronomySink::startMeasurements()
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{
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getMessageQueueToChannel()->push(RadioAstronomy::MsgMeasurementProgress::create(0));
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m_enabled = true;
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m_fftSumCount = 0;
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std::fill(m_fftSum, m_fftSum + m_settings.m_fftSize, 0.0f);
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}
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void RadioAstronomySink::stopMeasurements()
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{
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m_enabled = false;
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}
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void RadioAstronomySink::startCal(bool hot)
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{
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getMessageQueueToChannel()->push(RadioAstronomy::MsgMeasurementProgress::create(0));
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m_cal = true;
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m_hot = hot;
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m_fftSumCount = 0;
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std::fill(m_fftSum, m_fftSum + m_settings.m_fftSize, 0.0f);
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}
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void RadioAstronomySink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "RadioAstronomySink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " channelFrequencyOffset: " << channelFrequencyOffset;
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if ((m_channelFrequencyOffset != channelFrequencyOffset) ||
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(m_channelSampleRate != channelSampleRate) || force)
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{
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m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
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}
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if ((m_channelSampleRate != channelSampleRate) || force)
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{
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m_interpolator.create(16, channelSampleRate, m_settings.m_rfBandwidth / 2.0f);
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m_interpolatorDistance = (Real) channelSampleRate / (Real) m_settings.m_sampleRate;
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m_interpolatorDistanceRemain = m_interpolatorDistance;
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}
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m_channelSampleRate = channelSampleRate;
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m_channelFrequencyOffset = channelFrequencyOffset;
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}
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void RadioAstronomySink::applySettings(const RadioAstronomySettings& settings, bool force)
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{
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qDebug() << "RadioAstronomySink::applySettings:"
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<< " m_sampleRate: " << settings.m_sampleRate
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<< " m_rfBandwidth: " << settings.m_rfBandwidth
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<< " m_fftSize: " << settings.m_fftSize
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<< " m_fftWindow: " << settings.m_fftWindow
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<< " m_filterFreqs: " << settings.m_filterFreqs
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<< " force: " << force;
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if ((settings.m_rfBandwidth != m_settings.m_rfBandwidth)
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|| (settings.m_sampleRate != m_settings.m_sampleRate)
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|| force)
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{
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m_interpolator.create(16, m_channelSampleRate, settings.m_rfBandwidth / 2.0f); // 2.0 rather than 2.2 as in other plugins, to reduce rolloff at edge of band
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m_interpolatorDistance = (Real) m_channelSampleRate / (Real) settings.m_sampleRate;
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m_interpolatorDistanceRemain = m_interpolatorDistance;
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}
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if ((settings.m_fftSize != m_settings.m_fftSize) || force)
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{
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FFTFactory *fftFactory = DSPEngine::instance()->getFFTFactory();
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if (m_fftSequence >= 0) {
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fftFactory->releaseEngine(m_settings.m_fftSize, false, m_fftSequence);
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}
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m_fftSequence = fftFactory->getEngine(settings.m_fftSize, false, &m_fft);
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m_fftCounter = 0;
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delete[] m_fftSum;
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delete[] m_fftTemp;
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m_fftSum = new Real[settings.m_fftSize]();
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m_fftTemp = new Real[settings.m_fftSize]();
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m_fftSumCount = 0;
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}
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if ((settings.m_fftSize != m_settings.m_fftSize)
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|| (settings.m_fftWindow != m_settings.m_fftWindow)
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|| force)
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{
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if (settings.m_fftWindow == RadioAstronomySettings::HAN) {
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m_fftWindow.create(FFTWindow::Hanning, settings.m_fftSize);
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} else {
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m_fftWindow.create(FFTWindow::Rectangle, settings.m_fftSize);
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}
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}
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if ((settings.m_filterFreqs != m_settings.m_filterFreqs) || force)
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{
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m_filterBins.clear();
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QStringList filterFreqs = settings.m_filterFreqs.split(" ");
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for (int i = 0; i < filterFreqs.size(); i++)
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{
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bool ok;
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int bin = filterFreqs[i].toInt(&ok);
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if (ok) {
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m_filterBins.append(bin);
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}
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}
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}
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m_settings = settings;
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}
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