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Added PCPS based Acquisition Files

This commit is contained in:
piyush0411 2020-06-06 14:25:46 +05:30
parent 8c965bb4f3
commit 9e38cc4ef5
2 changed files with 451 additions and 0 deletions

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/*!
* \file galileo_e5b_pcps_acquisition.cc
* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
* Galileo E5b data and pilot Signals
* \author Piyush Gupta, 2020. piyush04111999@gmail.com
* \note Code added as part of GSoC 2020 program.
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
* -------------------------------------------------------------------------
*/
#include "galileo_e5b_pcps_acquisition.h"
#include "Galileo_E5b.h"
#include "acq_conf.h"
#include "configuration_interface.h"
#include "galileo_e5_signal_processing.h"
#include "gnss_sdr_flags.h"
#include <glog/logging.h>
#include <volk_gnsssdr/volk_gnsssdr_complex.h>
#include <algorithm>
#if HAS_STD_SPAN
#include <span>
namespace own = std;
#else
#include <gsl/gsl>
namespace own = gsl;
#endif
GalileoE5bPcpsAcquisition::GalileoE5bPcpsAcquisition(ConfigurationInterface* configuration,
const std::string& role,
unsigned int in_streams,
unsigned int out_streams) : role_(role),
in_streams_(in_streams),
out_streams_(out_streams)
{
configuration_ = configuration;
acq_parameters_.ms_per_code = 1;
acq_parameters_.SetFromConfiguration(configuration_, role, GALILEO_E5B_CODE_CHIP_RATE_CPS, GALILEO_E5B_OPT_ACQ_FS_SPS);
DLOG(INFO) << "Role " << role;
if (FLAGS_doppler_max != 0)
{
acq_parameters_.doppler_max = FLAGS_doppler_max;
}
doppler_max_ = acq_parameters_.doppler_max;
doppler_step_ = acq_parameters_.doppler_step;
item_type_ = acq_parameters_.item_type;
item_size_ = acq_parameters_.it_size;
fs_in_ = acq_parameters_.fs_in;
acq_pilot_ = configuration_->property(role + ".acquire_pilot", false);
acq_iq_ = configuration_->property(role + ".acquire_iq", false);
if (acq_iq_)
{
acq_pilot_ = false;
}
code_length_ = static_cast<unsigned int>(std::floor(static_cast<double>(acq_parameters_.resampled_fs) / (GALILEO_E5B_CODE_CHIP_RATE_CPS / GALILEO_E5B_CODE_LENGTH_CHIPS)));
vector_length_ = std::floor(acq_parameters_.sampled_ms * acq_parameters_.samples_per_ms) * (acq_parameters_.bit_transition_flag ? 2 : 1);
code_ = std::vector<std::complex<float>>(vector_length_);
sampled_ms_ = acq_parameters_.sampled_ms;
acquisition_ = pcps_make_acquisition(acq_parameters_);
DLOG(INFO) << "acquisition(" << acquisition_->unique_id() << ")";
channel_ = 0;
threshold_ = 0.0;
doppler_center_ = 0;
gnss_synchro_ = nullptr;
if (in_streams_ > 1)
{
LOG(ERROR) << "This implementation only supports one input stream";
}
if (out_streams_ > 0)
{
LOG(ERROR) << "This implementation does not provide an output stream";
}
}
void GalileoE5bPcpsAcquisition::stop_acquisition()
{
}
void GalileoE5bPcpsAcquisition::set_threshold(float threshold)
{
threshold_ = threshold;
acquisition_->set_threshold(threshold_);
}
void GalileoE5bPcpsAcquisition::set_doppler_max(unsigned int doppler_max)
{
doppler_max_ = doppler_max;
acquisition_->set_doppler_max(doppler_max_);
}
void GalileoE5bPcpsAcquisition::set_doppler_step(unsigned int doppler_step)
{
doppler_step_ = doppler_step;
acquisition_->set_doppler_step(doppler_step_);
}
void GalileoE5bPcpsAcquisition::set_doppler_center(int doppler_center)
{
doppler_center_ = doppler_center;
acquisition_->set_doppler_center(doppler_center_);
}
void GalileoE5bPcpsAcquisition::set_gnss_synchro(Gnss_Synchro* gnss_synchro)
{
gnss_synchro_ = gnss_synchro;
acquisition_->set_gnss_synchro(gnss_synchro_);
}
signed int GalileoE5bPcpsAcquisition::mag()
{
return acquisition_->mag();
}
void GalileoE5bPcpsAcquisition::init()
{
acquisition_->init();
}
void GalileoE5bPcpsAcquisition::set_local_code()
{
std::vector<std::complex<float>> code(code_length_);
std::array<char, 3> signal_{};
signal_[0] = '7';
signal_[2] = '\0';
if (acq_iq_)
{
signal_[1] = 'X';
}
else if (acq_pilot_)
{
signal_[1] = 'Q';
}
else
{
signal_[1] = 'I';
}
if (acq_parameters_.use_automatic_resampler)
{
galileo_e5_b_code_gen_complex_sampled(code, gnss_synchro_->PRN, signal_, acq_parameters_.resampled_fs, 0);
}
else
{
galileo_e5_b_code_gen_complex_sampled(code, gnss_synchro_->PRN, signal_, fs_in_, 0);
}
own::span<gr_complex> code_span(code_.data(), vector_length_);
for (unsigned int i = 0; i < sampled_ms_; i++)
{
std::copy_n(code.data(), code_length_, code_span.subspan(i * code_length_, code_length_).data());
}
acquisition_->set_local_code(code_.data());
}
void GalileoE5bPcpsAcquisition::reset()
{
acquisition_->set_active(true);
}
void GalileoE5bPcpsAcquisition::set_state(int state)
{
acquisition_->set_state(state);
}
void GalileoE5bPcpsAcquisition::connect(gr::top_block_sptr top_block __attribute__((unused)))
{
if (item_type_ == "gr_complex")
{
// nothing to connect
}
else if (item_type_ == "cshort")
{
// nothing to connect
}
else
{
LOG(WARNING) << item_type_ << " unknown acquisition item type";
}
}
void GalileoE5bPcpsAcquisition::disconnect(gr::top_block_sptr top_block __attribute__((unused)))
{
if (item_type_ == "gr_complex")
{
// nothing to disconnect
}
else if (item_type_ == "cshort")
{
// nothing to disconnect
}
else
{
LOG(WARNING) << item_type_ << " unknown acquisition item type";
}
}
gr::basic_block_sptr GalileoE5bPcpsAcquisition::get_left_block()
{
return acquisition_;
}
gr::basic_block_sptr GalileoE5bPcpsAcquisition::get_right_block()
{
return acquisition_;
}
void GalileoE5bPcpsAcquisition::set_resampler_latency(uint32_t latency_samples)
{
acquisition_->set_resampler_latency(latency_samples);
}

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/*!
* \file galileo_e5b_pcps_acquisition.h
* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
* Galileo E5b data and pilot Signals
* \author Piyush Gupta, 2020. piyush04111999@gmail.com
* \note Code added as part of GSoC 2020 program.
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_GALILEO_E5B_PCPS_ACQUISITION_H
#define GNSS_SDR_GALILEO_E5B_PCPS_ACQUISITION_H
#include "channel_fsm.h"
#include "gnss_synchro.h"
#include "pcps_acquisition.h"
#include <memory>
#include <string>
#include <vector>
class ConfigurationInterface;
class GalileoE5bPcpsAcquisition : public AcquisitionInterface
{
public:
/*!
* \brief Constructor
*/
GalileoE5bPcpsAcquisition(ConfigurationInterface* configuration,
const std::string& role,
unsigned int in_streams,
unsigned int out_streams);
/*!
* \brief Destructor
*/
~GalileoE5bPcpsAcquisition() = default;
/*!
* \brief Role
*/
inline std::string role() override
{
return role_;
}
/*!
* \brief Returns "GALILEO_E5b_PCPS_Acquisition"
*/
inline std::string implementation() override
{
return "Galileo_E5b_PCPS_Acquisition";
}
/*!
* \brief Returns size of lv_16sc_t
*/
inline size_t item_size() override
{
return sizeof(int16_t);
}
/*!
* \brief Connect
*/
void connect(gr::top_block_sptr top_block) override;
/*!
* \brief Disconnect
*/
void disconnect(gr::top_block_sptr top_block) override;
/*!
* \brief Get left block
*/
gr::basic_block_sptr get_left_block() override;
/*!
* \brief Get right block
*/
gr::basic_block_sptr get_right_block() override;
/*!
* \brief Set acquisition/tracking common Gnss_Synchro object pointer
* to efficiently exchange synchronization data between acquisition and
* tracking blocks
*/
void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro) override;
/*!
* \brief Set acquisition channel unique ID
*/
inline void set_channel(unsigned int channel) override
{
channel_ = channel;
acquisition_->set_channel(channel_);
}
/*!
* \brief Set channel fsm associated to this acquisition instance
*/
inline void set_channel_fsm(std::weak_ptr<ChannelFsm> channel_fsm) override
{
channel_fsm_ = channel_fsm;
acquisition_->set_channel_fsm(channel_fsm);
}
/*!
* \brief Set statistics threshold of PCPS algorithm
*/
void set_threshold(float threshold) override;
/*!
* \brief Set maximum Doppler off grid search
*/
void set_doppler_max(unsigned int doppler_max) override;
/*!
* \brief Set Doppler steps for the grid search
*/
void set_doppler_step(unsigned int doppler_step) override;
/*!
* \brief Set Doppler center for the grid search
*/
void set_doppler_center(int doppler_center) override;
/*!
* \brief Initializes acquisition algorithm.
*/
void init() override;
/*!
* \brief Sets local Galileo E5b code for PCPS acquisition algorithm.
*/
void set_local_code() override;
/*!
* \brief Returns the maximum peak of grid search
*/
signed int mag() override;
/*!
* \brief Restart acquisition algorithm
*/
void reset() override;
/*!
* \brief If set to 1, ensures that acquisition starts at the
* first available sample.
* \param state - int=1 forces start of acquisition
*/
void set_state(int state) override;
/*!
* \brief Stop running acquisition
*/
void stop_acquisition() override;
/*!
* \brief Sets the resampler latency to account it in the acquisition code delay estimation
*/
void set_resampler_latency(uint32_t latency_samples) override;
private:
ConfigurationInterface* configuration_;
pcps_acquisition_sptr acquisition_;
Acq_Conf acq_parameters_;
size_t item_size_;
std::string item_type_;
std::string dump_filename_;
std::string role_;
bool acq_pilot_;
bool acq_iq_;
unsigned int vector_length_;
unsigned int code_length_;
unsigned int channel_;
std::weak_ptr<ChannelFsm> channel_fsm_;
unsigned int doppler_max_;
unsigned int doppler_step_;
int doppler_center_;
unsigned int sampled_ms_;
unsigned int in_streams_;
unsigned int out_streams_;
int64_t fs_in_;
float threshold_;
std::vector<std::complex<float>> code_;
Gnss_Synchro* gnss_synchro_;
};
#endif // GNSS_SDR_GALILEO_E5B_PCPS_ACQUISITION_H