/*! * \file galileo_e5a_dll_pll_tracking_fpga.cc * \brief Adapts a code DLL + carrier PLL * tracking block to a TrackingInterface for Galileo E5a signals for the FPGA * \author Marc Majoral, 2019. mmajoral(at)cttc.cat * * ----------------------------------------------------------------------------- * * GNSS-SDR is a Global Navigation Satellite System software-defined receiver. * This file is part of GNSS-SDR. * * Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors) * SPDX-License-Identifier: GPL-3.0-or-later * * ----------------------------------------------------------------------------- */ #include "galileo_e5a_dll_pll_tracking_fpga.h" #include "Galileo_E5a.h" #include "configuration_interface.h" #include "display.h" #include "dll_pll_conf_fpga.h" #include "galileo_e5_signal_replica.h" #include "gnss_sdr_flags.h" #include "uio_fpga.h" #include #include #include GalileoE5aDllPllTrackingFpga::GalileoE5aDllPllTrackingFpga( const ConfigurationInterface *configuration, const std::string &role, unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams) { Dll_Pll_Conf_Fpga trk_params_fpga = Dll_Pll_Conf_Fpga(); DLOG(INFO) << "role " << role; trk_params_fpga.SetFromConfiguration(configuration, role); const auto vector_length = static_cast(std::round(trk_params_fpga.fs_in / (GALILEO_E5A_CODE_CHIP_RATE_CPS / GALILEO_E5A_CODE_LENGTH_CHIPS))); trk_params_fpga.vector_length = vector_length; d_track_pilot = trk_params_fpga.track_pilot; if (trk_params_fpga.extend_correlation_symbols < 1) { trk_params_fpga.extend_correlation_symbols = 1; std::cout << TEXT_RED << "WARNING: Galileo E5a. extend_correlation_symbols must be bigger than 0. Coherent integration has been set to 1 symbol (1 ms)" << TEXT_RESET << '\n'; } else if (!trk_params_fpga.track_pilot and trk_params_fpga.extend_correlation_symbols > GALILEO_E5A_I_SECONDARY_CODE_LENGTH) { trk_params_fpga.extend_correlation_symbols = GALILEO_E5A_I_SECONDARY_CODE_LENGTH; std::cout << TEXT_RED << "WARNING: Galileo E5a. extend_correlation_symbols must be lower than 21 when tracking the data component. Coherent integration has been set to 20 symbols (20 ms)" << TEXT_RESET << '\n'; } if ((trk_params_fpga.extend_correlation_symbols > 1) and (trk_params_fpga.pll_bw_narrow_hz > trk_params_fpga.pll_bw_hz or trk_params_fpga.dll_bw_narrow_hz > trk_params_fpga.dll_bw_hz)) { std::cout << TEXT_RED << "WARNING: Galileo E5a. PLL or DLL narrow tracking bandwidth is higher than wide tracking one" << TEXT_RESET << '\n'; } trk_params_fpga.system = 'E'; const std::array sig_{'5', 'X', '\0'}; std::memcpy(trk_params_fpga.signal, sig_.data(), 3); d_data_codes = nullptr; // UIO device file device_name = configuration->property(role + ".devicename", default_device_name_Galileo_E5a); // compute the number of tracking channels that have already been instantiated. The order in which // GNSS-SDR instantiates the tracking channels i L1, L2, L5, E1, E5a // However E5a can use the same tracking HW accelerators as L5 (but not simultaneously). // Therefore for the proper assignment of the FPGA tracking device file numbers to the E5a tracking channels, // the number of channels that have already been assigned to L5 must not be substracted to this channel number, // so they are not counted here. uint32_t num_prev_assigned_ch_1C = configuration->property("Channels_1C.count", 0); uint32_t num_prev_assigned_ch_2S = 0; if (configuration->property("Tracking_2S.devicename", std::string("")) != device_name) { num_prev_assigned_ch_2S = configuration->property("Channels_2S.count", 0); } uint32_t num_prev_assigned_ch_1B = configuration->property("Channels_1B.count", 0); num_prev_assigned_ch = num_prev_assigned_ch_1C + num_prev_assigned_ch_2S + num_prev_assigned_ch_1B; // ################# PRE-COMPUTE ALL THE CODES ################# uint32_t code_samples_per_chip = 1; auto code_length_chips = static_cast(GALILEO_E5A_CODE_LENGTH_CHIPS); volk_gnsssdr::vector aux_code(code_length_chips * code_samples_per_chip, gr_complex(0.0, 0.0)); d_ca_codes = static_cast(volk_gnsssdr_malloc(static_cast(code_length_chips) * code_samples_per_chip * GALILEO_E5A_NUMBER_OF_CODES * sizeof(int32_t), volk_gnsssdr_get_alignment())); if (trk_params_fpga.track_pilot) { d_data_codes = static_cast(volk_gnsssdr_malloc((static_cast(code_length_chips)) * code_samples_per_chip * GALILEO_E5A_NUMBER_OF_CODES * sizeof(int32_t), volk_gnsssdr_get_alignment())); } for (uint32_t PRN = 1; PRN <= GALILEO_E5A_NUMBER_OF_CODES; PRN++) { const std::array sig_a = {'5', 'X', '\0'}; galileo_e5_a_code_gen_complex_primary(aux_code, PRN, sig_a); if (trk_params_fpga.track_pilot) { // The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA for (uint32_t s = 0; s < code_length_chips; s++) { auto tmp_value = static_cast(aux_code[s].imag()); if (tmp_value < 0) { tmp_value = 0; } tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY; d_ca_codes[static_cast(code_length_chips) * (PRN - 1) + s] = tmp_value; tmp_value = static_cast(aux_code[s].real()); if (tmp_value < 0) { tmp_value = 0; } tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY | LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT; d_data_codes[static_cast(code_length_chips) * (PRN - 1) + s] = tmp_value; } } else { // The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA for (uint32_t s = 0; s < code_length_chips; s++) { auto tmp_value = static_cast(aux_code[s].real()); if (tmp_value < 0) { tmp_value = 0; } tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY; d_ca_codes[static_cast(code_length_chips) * (PRN - 1) + s] = tmp_value; } } } trk_params_fpga.ca_codes = d_ca_codes; trk_params_fpga.data_codes = d_data_codes; trk_params_fpga.code_length_chips = code_length_chips; trk_params_fpga.code_samples_per_chip = code_samples_per_chip; // 2 sample per chip trk_params_fpga.extended_correlation_in_fpga = false; // by default trk_params_fpga.extend_fpga_integration_periods = 1; // (number of FPGA integrations that are combined in the SW) trk_params_fpga.fpga_integration_period = 1; // (number of symbols that are effectively integrated in the FPGA) if (d_track_pilot) { if (trk_params_fpga.extend_correlation_symbols > 1) { if (trk_params_fpga.extend_correlation_symbols <= GALILEO_E5A_I_SECONDARY_CODE_LENGTH) { if ((GALILEO_E5A_I_SECONDARY_CODE_LENGTH % trk_params_fpga.extend_correlation_symbols) == 0) { trk_params_fpga.extended_correlation_in_fpga = true; trk_params_fpga.fpga_integration_period = trk_params_fpga.extend_correlation_symbols; } } else { if (trk_params_fpga.extend_correlation_symbols % GALILEO_E5A_I_SECONDARY_CODE_LENGTH == 0) { trk_params_fpga.extended_correlation_in_fpga = true; trk_params_fpga.extend_fpga_integration_periods = trk_params_fpga.extend_correlation_symbols / GALILEO_E5A_I_SECONDARY_CODE_LENGTH; trk_params_fpga.fpga_integration_period = GALILEO_E5A_I_SECONDARY_CODE_LENGTH; } } } } // ################# MAKE TRACKING GNURadio object ################### tracking_fpga_sc = dll_pll_veml_make_tracking_fpga(trk_params_fpga); channel_ = 0; DLOG(INFO) << "tracking(" << tracking_fpga_sc->unique_id() << ")"; if (in_streams_ > 1) { LOG(ERROR) << "This implementation only supports one input stream"; } if (out_streams_ > 1) { LOG(ERROR) << "This implementation only supports one output stream"; } } GalileoE5aDllPllTrackingFpga::~GalileoE5aDllPllTrackingFpga() { volk_gnsssdr_free(d_ca_codes); if (d_track_pilot) { volk_gnsssdr_free(d_data_codes); } } void GalileoE5aDllPllTrackingFpga::start_tracking() { tracking_fpga_sc->start_tracking(); } void GalileoE5aDllPllTrackingFpga::stop_tracking() { tracking_fpga_sc->stop_tracking(); } /* * Set tracking channel unique ID */ void GalileoE5aDllPllTrackingFpga::set_channel(unsigned int channel) { channel_ = channel; // UIO device file std::string device_io_name; // find the uio device file corresponding to the tracking multicorrelator if (find_uio_dev_file_name(device_io_name, device_name, channel - num_prev_assigned_ch) < 0) { std::cout << "Cannot find the FPGA uio device file corresponding to device name " << device_name << std::endl; throw std::exception(); } tracking_fpga_sc->set_channel(channel, device_io_name); } void GalileoE5aDllPllTrackingFpga::set_gnss_synchro(Gnss_Synchro *p_gnss_synchro) { tracking_fpga_sc->set_gnss_synchro(p_gnss_synchro); } void GalileoE5aDllPllTrackingFpga::connect(gr::top_block_sptr top_block) { if (top_block) { /* top_block is not null */ }; // nothing to connect, now the tracking uses gr_sync_decimator } void GalileoE5aDllPllTrackingFpga::disconnect(gr::top_block_sptr top_block) { if (top_block) { /* top_block is not null */ }; // nothing to disconnect, now the tracking uses gr_sync_decimator } gr::basic_block_sptr GalileoE5aDllPllTrackingFpga::get_left_block() { return tracking_fpga_sc; } gr::basic_block_sptr GalileoE5aDllPllTrackingFpga::get_right_block() { return tracking_fpga_sc; }