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266 lines
10 KiB
C++
266 lines
10 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2023 Jon Beniston, M7RCE <jon@beniston.com> //
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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 <complex.h>
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#include "dsp/dspengine.h"
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#include "util/db.h"
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#include "freqscanner.h"
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#include "freqscannersink.h"
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FreqScannerSink::FreqScannerSink(FreqScanner *ilsDemod) :
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m_freqScanner(ilsDemod),
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m_channel(nullptr),
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m_channelSampleRate(48000),
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m_channelFrequencyOffset(0),
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m_scannerSampleRate(33320),
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m_centerFrequency(0),
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m_messageQueueToChannel(nullptr),
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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_fftSize(1024),
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m_binsPerChannel(16),
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m_averageCount(0)
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{
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applySettings(m_settings, QStringList(), true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, 16, 4, true);
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}
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FreqScannerSink::~FreqScannerSink()
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{
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}
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void FreqScannerSink::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 (and filter)
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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 FreqScannerSink::processOneSample(Complex &ci)
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{
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ci /= SDR_RX_SCALEF;
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m_fft->in()[m_fftCounter] = ci;
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m_fftCounter++;
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if (m_fftCounter == m_fftSize)
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{
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// Apply windowing function
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m_fftWindow.apply(m_fft->in());
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// Perform FFT
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m_fft->transform();
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// Reorder (so negative frequencies are first) and average
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int halfSize = m_fftSize / 2;
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for (int i = 0; i < halfSize; i++) {
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m_fftAverage.storeAndGetAvg(m_magSq[i], magSq(i + halfSize), i);
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}
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for (int i = 0; i < halfSize; i++) {
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m_fftAverage.storeAndGetAvg(m_magSq[i + halfSize], magSq(i), i + halfSize);
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}
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if (m_fftAverage.nextAverage())
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{
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// Send results to channel
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if (getMessageQueueToChannel() && (m_settings.m_channelBandwidth != 0) && (m_binsPerChannel != 0))
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{
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FreqScanner::MsgScanResult* msg = FreqScanner::MsgScanResult::create(m_fftStartTime);
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QList<FreqScanner::MsgScanResult::ScanResult>& results = msg->getScanResults();
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for (int i = 0; i < m_settings.m_frequencySettings.size(); i++)
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{
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if (m_settings.m_frequencySettings[i].m_enabled)
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{
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qint64 frequency = m_settings.m_frequencySettings[i].m_frequency;
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qint64 startFrequency = m_centerFrequency - m_scannerSampleRate / 2;
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qint64 diff = frequency - startFrequency;
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float binBW = m_scannerSampleRate / (float)m_fftSize;
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// Ignore results in uppper and lower 12.5%, as there may be aliasing here from half-band filters
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if ((diff < m_scannerSampleRate * 0.875f) && (diff >= m_scannerSampleRate * 0.125f))
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{
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int bin = std::round(diff / binBW);
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int channelBins;
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if (m_settings.m_frequencySettings[i].m_channelBandwidth.isEmpty())
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{
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channelBins = m_binsPerChannel;
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}
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else
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{
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int channelBW = m_settings.getChannelBandwidth(&m_settings.m_frequencySettings[i]);
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channelBins = m_fftSize / (m_scannerSampleRate / (float)channelBW);
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}
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// Calculate power at that frequency
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Real power;
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if (m_settings.m_measurement == FreqScannerSettings::PEAK) {
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power = peakPower(bin, channelBins);
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} else {
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power = totalPower(bin, channelBins);
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}
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//qDebug() << "startFrequency:" << startFrequency << "m_scannerSampleRate:" << m_scannerSampleRate << "m_centerFrequency:" << m_centerFrequency << "frequency" << frequency << "bin" << bin << "power" << power;
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FreqScanner::MsgScanResult::ScanResult result = {frequency, power};
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results.append(result);
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}
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}
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}
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getMessageQueueToChannel()->push(msg);
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}
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m_averageCount = 0;
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m_fftStartTime = QDateTime::currentDateTime();
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}
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m_fftCounter = 0;
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}
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}
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// Calculate total power in a channel containing the specified bin (i.e. sums adjacent bins in the same channel)
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Real FreqScannerSink::totalPower(int bin, int channelBins) const
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{
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// Skip bin between halfway between channels
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// Then skip first and last bins, to avoid spectral leakage (particularly at DC)
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int startBin = bin - channelBins / 2 + 1 + 1;
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Real magSqSum = 0.0f;
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for (int i = 0; i < channelBins - 2 - 1; i++) {
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int idx = startBin + i;
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if ((idx < 0) || (idx >= m_fftSize)) {
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continue;
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}
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magSqSum += m_magSq[idx];
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}
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Real db = CalcDb::dbPower(magSqSum);
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return db;
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}
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// Calculate peak power in a channel containing the specified bin
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Real FreqScannerSink::peakPower(int bin, int channelBins) const
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{
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// Skip bin between halfway between channels
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// Then skip first and last bins, to avoid spectral leakage (particularly at DC)
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int startBin = bin - channelBins/2 + 1 + 1;
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Real maxMagSq = std::numeric_limits<Real>::min();
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for (int i = 0; i < channelBins - 2 - 1; i++)
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{
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int idx = startBin + i;
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if ((idx < 0) || (idx >= m_fftSize)) {
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continue;
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}
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//qDebug() << "idx:" << idx << "power:" << CalcDb::dbPower(m_magSq[idx]);
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maxMagSq = std::max(maxMagSq, m_magSq[idx]);
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}
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Real db = CalcDb::dbPower(maxMagSq);
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return db;
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}
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Real FreqScannerSink::magSq(int bin) const
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{
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Complex c = m_fft->out()[bin];
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Real v = c.real() * c.real() + c.imag() * c.imag();
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Real magsq = v / (m_fftSize * m_fftSize);
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return magsq;
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}
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void FreqScannerSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, int scannerSampleRate, int fftSize, int binsPerChannel, bool force)
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{
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qDebug() << "FreqScannerSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " channelFrequencyOffset: " << channelFrequencyOffset
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<< " scannerSampleRate: " << scannerSampleRate
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<< " fftSize: " << fftSize
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<< " binsPerChannel: " << binsPerChannel;
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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) || (m_scannerSampleRate != scannerSampleRate) || force)
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{
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m_interpolator.create(16, channelSampleRate, scannerSampleRate / 2.2); // Filter potential aliasing resulting from half-band filters
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m_interpolatorDistance = (Real) channelSampleRate / (Real)scannerSampleRate;
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m_interpolatorDistanceRemain = m_interpolatorDistance;
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}
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if ((m_fftSize != 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(fftSize, false, m_fftSequence);
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}
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m_fftSequence = fftFactory->getEngine(fftSize, false, &m_fft);
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m_fftCounter = 0;
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m_fftStartTime = QDateTime::currentDateTime();
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m_fftWindow.create(FFTWindow::Hanning, fftSize);
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int averages = m_settings.m_scanTime * scannerSampleRate / 2 / fftSize;
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m_fftAverage.resize(fftSize, averages);
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m_magSq.resize(fftSize);
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}
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m_channelSampleRate = channelSampleRate;
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m_channelFrequencyOffset = channelFrequencyOffset;
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m_scannerSampleRate = scannerSampleRate;
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m_fftSize = fftSize;
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m_binsPerChannel = binsPerChannel;
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}
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void FreqScannerSink::applySettings(const FreqScannerSettings& settings, const QStringList& settingsKeys, bool force)
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{
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qDebug() << "FreqScannerSink::applySettings:"
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<< settings.getDebugString(settingsKeys, force)
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<< " force: " << force;
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if (settingsKeys.contains("scanTime") || force)
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{
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int averages = settings.m_scanTime * m_scannerSampleRate / 2 / m_fftSize;
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m_fftAverage.resize(m_fftSize, averages);
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}
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if (force) {
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m_settings = settings;
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} else {
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m_settings.applySettings(settingsKeys, settings);
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}
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}
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