mirror of https://github.com/gnss-sdr/gnss-sdr
220 lines
6.1 KiB
C++
220 lines
6.1 KiB
C++
/*!
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* \file gps_l1_ca_pcps_acquisition_fpga.h
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* \brief Adapts a PCPS acquisition block to an AcquisitionInterface
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* for GPS L1 C/A signals for the FPGA
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* \authors <ul>
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* <li> Marc Majoral, 2019. mmajoral(at)cttc.es
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* <li> Javier Arribas, 2019. jarribas(at)cttc.es
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* </ul>
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR 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, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GNSS-SDR 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 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_
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#define GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_
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#include "channel_fsm.h"
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#include "gnss_synchro.h"
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#include "pcps_acquisition_fpga.h"
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#include <memory>
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#include <string>
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#include <vector>
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class ConfigurationInterface;
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/*!
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* \brief This class adapts a PCPS acquisition block off-loaded on an FPGA
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* to an AcquisitionInterface for GPS L1 C/A signals
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*/
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class GpsL1CaPcpsAcquisitionFpga : public AcquisitionInterface
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{
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public:
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/*!
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* \brief Constructor
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*/
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GpsL1CaPcpsAcquisitionFpga(ConfigurationInterface* configuration,
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const std::string& role,
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unsigned int in_streams,
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unsigned int out_streams);
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/*!
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* \brief Destructor
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*/
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~GpsL1CaPcpsAcquisitionFpga() = default;
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/*!
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* \brief Role
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*/
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inline std::string role() override
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{
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return role_;
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}
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/*!
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* \brief Returns "GPS_L1_CA_PCPS_Acquisition_Fpga"
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*/
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inline std::string implementation() override
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{
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return "GPS_L1_CA_PCPS_Acquisition_Fpga";
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}
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/*!
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* \brief Returns size of lv_16sc_t
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*/
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inline size_t item_size() override
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{
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return sizeof(int16_t);
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}
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/*!
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* \brief Connect
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*/
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void connect(gr::top_block_sptr top_block) override;
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/*!
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* \brief Disconnect
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*/
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void disconnect(gr::top_block_sptr top_block) override;
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/*!
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* \brief Get left block
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*/
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gr::basic_block_sptr get_left_block() override;
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/*!
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* \brief Get right block
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*/
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gr::basic_block_sptr get_right_block() override;
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/*!
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* \brief Set acquisition/tracking common Gnss_Synchro object pointer
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* to efficiently exchange synchronization data between acquisition and
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* tracking blocks
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*/
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void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro) override;
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/*!
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* \brief Set acquisition channel unique ID
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*/
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inline void set_channel(unsigned int channel) override
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{
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channel_ = channel;
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acquisition_fpga_->set_channel(channel_);
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}
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/*!
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* \brief Set channel fsm associated to this acquisition instance
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*/
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inline void set_channel_fsm(std::weak_ptr<ChannelFsm> channel_fsm) override
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{
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channel_fsm_ = channel_fsm;
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acquisition_fpga_->set_channel_fsm(channel_fsm);
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}
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/*!
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* \brief Set statistics threshold of PCPS algorithm
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*/
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void set_threshold(float threshold) override;
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/*!
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* \brief Set maximum Doppler off grid search
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*/
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void set_doppler_max(unsigned int doppler_max) override;
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/*!
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* \brief Set Doppler steps for the grid search
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*/
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void set_doppler_step(unsigned int doppler_step) override;
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/*!
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* \brief Set Doppler center for the grid search
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*/
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void set_doppler_center(int doppler_center) override;
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/*!
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* \brief Initializes acquisition algorithm.
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*/
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void init() override;
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/*!
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* \brief Sets local code for GPS L1/CA PCPS acquisition algorithm.
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*/
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void set_local_code() override;
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/*!
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* \brief Returns the maximum peak of grid search
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*/
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signed int mag() override;
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/*!
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* \brief Restart acquisition algorithm
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*/
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void reset() override;
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/*!
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* \brief If state = 1, it forces the block to start acquiring from the first sample
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*/
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void set_state(int state) override;
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/*!
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* \brief Stop running acquisition
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*/
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void stop_acquisition() override;
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/*!
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* \brief Set Resampler Latency
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*/
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void set_resampler_latency(uint32_t latency_samples __attribute__((unused))) override{};
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private:
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static const uint32_t NUM_PRNs = 32;
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// the following flags are FPGA-specific and they are using arrange the values of the fft of the local code in the way the FPGA
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// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
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static const uint32_t quant_bits_local_code = 16;
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static const uint32_t select_lsbits = 0x0000FFFF; // Select the 10 LSbits out of a 20-bit word
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static const uint32_t select_msbits = 0xFFFF0000; // Select the 10 MSbits out of a 20-bit word
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static const uint32_t select_all_code_bits = 0xFFFFFFFF; // Select a 20 bit word
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static const uint32_t shl_code_bits = 65536; // shift left by 10 bits
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ConfigurationInterface* configuration_;
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pcps_acquisition_fpga_sptr acquisition_fpga_;
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uint32_t channel_;
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std::weak_ptr<ChannelFsm> channel_fsm_;
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uint32_t doppler_max_;
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uint32_t doppler_step_;
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int32_t doppler_center_;
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Gnss_Synchro* gnss_synchro_;
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std::string role_;
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unsigned int in_streams_;
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unsigned int out_streams_;
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std::vector<uint32_t> d_all_fft_codes_; // memory that contains all the code ffts
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};
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#endif // GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_
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