mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-12-24 10:50:29 -05:00
145 lines
5.4 KiB
C++
145 lines
5.4 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019-2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
|
|
// Copyright (C) 2020-2022 Jon Beniston, M7RCE <jon@beniston.com> //
|
|
// Copyright (C) 2020 Kacper Michajłow <kasper93@gmail.com> //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef INCLUDE_RADIOSONDEDEMODSINK_H
|
|
#define INCLUDE_RADIOSONDEDEMODSINK_H
|
|
|
|
#include <QVector>
|
|
|
|
#include "dsp/channelsamplesink.h"
|
|
#include "dsp/phasediscri.h"
|
|
#include "dsp/nco.h"
|
|
#include "dsp/interpolator.h"
|
|
#include "dsp/firfilter.h"
|
|
#include "dsp/gaussian.h"
|
|
#include "util/movingaverage.h"
|
|
#include "util/doublebufferfifo.h"
|
|
#include "util/messagequeue.h"
|
|
#include "util/crc.h"
|
|
|
|
#include "radiosondedemodsettings.h"
|
|
|
|
// Length of preamble (40 bytes) and frame (std 320 bytes - extended 518)
|
|
#define RADIOSONDEDEMOD_MAX_BYTES (40+518)
|
|
|
|
class ChannelAPI;
|
|
class RadiosondeDemod;
|
|
class ScopeVis;
|
|
|
|
class RadiosondeDemodSink : public ChannelSampleSink {
|
|
public:
|
|
RadiosondeDemodSink(RadiosondeDemod *radiosondeDemod);
|
|
~RadiosondeDemodSink();
|
|
|
|
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
|
|
|
|
void setScopeSink(ScopeVis* scopeSink) { m_scopeSink = scopeSink; }
|
|
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
|
|
void applySettings(const RadiosondeDemodSettings& settings, bool force = false);
|
|
void setMessageQueueToChannel(MessageQueue *messageQueue) { m_messageQueueToChannel = messageQueue; }
|
|
void setChannel(ChannelAPI *channel) { m_channel = channel; }
|
|
|
|
double getMagSq() const { return m_magsq; }
|
|
|
|
void getMagSqLevels(double& avg, double& peak, int& nbSamples)
|
|
{
|
|
if (m_magsqCount > 0)
|
|
{
|
|
m_magsq = m_magsqSum / m_magsqCount;
|
|
m_magSqLevelStore.m_magsq = m_magsq;
|
|
m_magSqLevelStore.m_magsqPeak = m_magsqPeak;
|
|
}
|
|
|
|
avg = m_magSqLevelStore.m_magsq;
|
|
peak = m_magSqLevelStore.m_magsqPeak;
|
|
nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
|
|
|
|
m_magsqSum = 0.0f;
|
|
m_magsqPeak = 0.0f;
|
|
m_magsqCount = 0;
|
|
}
|
|
|
|
|
|
private:
|
|
struct MagSqLevelsStore
|
|
{
|
|
MagSqLevelsStore() :
|
|
m_magsq(1e-12),
|
|
m_magsqPeak(1e-12)
|
|
{}
|
|
double m_magsq;
|
|
double m_magsqPeak;
|
|
};
|
|
|
|
ScopeVis* m_scopeSink; // Scope GUI to display baseband waveform
|
|
RadiosondeDemod *m_radiosondeDemod;
|
|
RadiosondeDemodSettings m_settings;
|
|
ChannelAPI *m_channel;
|
|
int m_channelSampleRate;
|
|
int m_channelFrequencyOffset;
|
|
int m_samplesPerSymbol; // Number of samples per symbol
|
|
|
|
NCO m_nco;
|
|
Interpolator m_interpolator;
|
|
Real m_interpolatorDistance;
|
|
Real m_interpolatorDistanceRemain;
|
|
|
|
double m_magsq;
|
|
double m_magsqSum;
|
|
double m_magsqPeak;
|
|
int m_magsqCount;
|
|
MagSqLevelsStore m_magSqLevelStore;
|
|
|
|
MessageQueue *m_messageQueueToChannel;
|
|
|
|
MovingAverageUtil<Real, double, 16> m_movingAverage;
|
|
|
|
Lowpass<Complex> m_lowpass; // RF input filter
|
|
PhaseDiscriminators m_phaseDiscri; // FM demodulator
|
|
Gaussian<Real> m_pulseShape; // Pulse shaping filter
|
|
Real *m_rxBuf; // Receive sample buffer, large enough for one max length messsage
|
|
int m_rxBufLength; // Size in elements in m_rxBuf
|
|
int m_rxBufIdx; // Index in to circular buffer
|
|
int m_rxBufCnt; // Number of valid samples in buffer
|
|
Real *m_train; // Training sequence to look for
|
|
int m_correlationLength;
|
|
|
|
unsigned char m_bytes[RADIOSONDEDEMOD_MAX_BYTES];
|
|
crc16ccitt m_crc;
|
|
|
|
QVector<qint16> m_demodBuffer;
|
|
int m_demodBufferFill;
|
|
|
|
SampleVector m_sampleBuffer;
|
|
static const int m_sampleBufferSize = RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE / 20;
|
|
int m_sampleBufferIndex;
|
|
|
|
static const uint8_t m_descramble[64];
|
|
|
|
MessageQueue *getMessageQueueToChannel() { return m_messageQueueToChannel; }
|
|
void processOneSample(Complex &ci);
|
|
Real correlate(int idx) const;
|
|
bool processFrame(int length, float corr, int sampleIdx);
|
|
int reedSolomonErrorCorrection();
|
|
bool checkCRCs(int length);
|
|
void sampleToScope(Complex sample);
|
|
};
|
|
|
|
#endif // INCLUDE_RADIOSONDEDEMODSINK_H
|