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/*!
* \file gps_l1_ca_pcps_acquisition.h
* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
* GPS L1 C/A signals
* \authors <ul>
* <li> Javier Arribas, 2011. jarribas(at)cttc.es
* <li> Luis Esteve, 2012. luis(at)epsilon-formacion.com
* <li> Marc Molina, 2013. marc.molina.pena(at)gmail.com
* </ul>
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (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.
*
* GNSS-SDR 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, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_H_
#define GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_H_
#include <string>
#include <gnuradio/blocks/stream_to_vector.h>
#include <gnuradio/blocks/float_to_complex.h>
#include "gnss_synchro.h"
#include "acquisition_interface.h"
#include "pcps_acquisition_cc.h"
#include "pcps_acquisition_sc.h"
#include "complex_byte_to_float_x2.h"
#include <volk_gnsssdr/volk_gnsssdr.h>
class ConfigurationInterface;
/*!
* \brief This class adapts a PCPS acquisition block to an AcquisitionInterface
* for GPS L1 C/A signals
*/
class GpsL1CaPcpsAcquisition: public AcquisitionInterface
{
public:
GpsL1CaPcpsAcquisition(ConfigurationInterface* configuration,
std::string role, unsigned int in_streams,
unsigned int out_streams);
virtual ~GpsL1CaPcpsAcquisition();
std::string role()
{
return role_;
}
/*!
* \brief Returns "GPS_L1_CA_PCPS_Acquisition"
*/
std::string implementation()
{
return "GPS_L1_CA_PCPS_Acquisition";
}
size_t item_size()
{
return item_size_;
}
void connect(gr::top_block_sptr top_block);
void disconnect(gr::top_block_sptr top_block);
gr::basic_block_sptr get_left_block();
gr::basic_block_sptr get_right_block();
/*!
* \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);
/*!
* \brief Set acquisition channel unique ID
*/
void set_channel(unsigned int channel);
/*!
* \brief Set statistics threshold of PCPS algorithm
*/
void set_threshold(float threshold);
/*!
* \brief Set maximum Doppler off grid search
*/
void set_doppler_max(unsigned int doppler_max);
/*!
* \brief Set Doppler steps for the grid search
*/
void set_doppler_step(unsigned int doppler_step);
/*!
* \brief Initializes acquisition algorithm.
*/
void init();
/*!
* \brief Sets local code for GPS L1/CA PCPS acquisition algorithm.
*/
void set_local_code();
/*!
* \brief Returns the maximum peak of grid search
*/
signed int mag();
/*!
* \brief Restart acquisition algorithm
*/
void reset();
/*!
* \brief If state = 1, it forces the block to start acquiring from the first sample
*/
void set_state(int state);
private:
ConfigurationInterface* configuration_;
pcps_acquisition_cc_sptr acquisition_cc_;
pcps_acquisition_sc_sptr acquisition_sc_;
gr::blocks::stream_to_vector::sptr stream_to_vector_;
gr::blocks::float_to_complex::sptr float_to_complex_;
complex_byte_to_float_x2_sptr cbyte_to_float_x2_;
size_t item_size_;
std::string item_type_;
unsigned int vector_length_;
unsigned int code_length_;
bool bit_transition_flag_;
bool use_CFAR_algorithm_flag_;
unsigned int channel_;
float threshold_;
unsigned int doppler_max_;
unsigned int doppler_step_;
unsigned int sampled_ms_;
unsigned int max_dwells_;
long fs_in_;
long if_;
bool dump_;
std::string dump_filename_;
std::complex<float> * code_;
Gnss_Synchro * gnss_synchro_;
std::string role_;
unsigned int in_streams_;
unsigned int out_streams_;
float calculate_threshold(float pfa);
};
#endif /* GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_H_ */