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implemented double acquisition for the FPGA

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This commit is contained in:
Marc Majoral 2019-02-28 20:49:35 +01:00
parent 39e9c28024
commit ea86546d99
9 changed files with 127 additions and 59 deletions
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4
src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition_fpga.cc
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@ -161,6 +161,10 @@ GalileoE1PcpsAmbiguousAcquisitionFpga::GalileoE1PcpsAmbiguousAcquisitionFpga(
acq_parameters.all_fft_codes = d_all_fft_codes_;
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);

4
src/algorithms/acquisition/adapters/galileo_e5a_pcps_acquisition_fpga.cc
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@ -162,6 +162,10 @@ GalileoE5aPcpsAcquisitionFpga::GalileoE5aPcpsAcquisitionFpga(ConfigurationInterf
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
acquisition_fpga_ = pcps_make_acquisition_fpga(acq_parameters);
DLOG(INFO) << "acquisition(" << acquisition_fpga_->unique_id() << ")";

4
src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fpga.cc
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@ -143,6 +143,10 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
acquisition_fpga_ = pcps_make_acquisition_fpga(acq_parameters);
DLOG(INFO) << "acquisition(" << acquisition_fpga_->unique_id() << ")";

4
src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition_fpga.cc
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@ -142,6 +142,10 @@ GpsL5iPcpsAcquisitionFpga::GpsL5iPcpsAcquisitionFpga(
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
acquisition_fpga_ = pcps_make_acquisition_fpga(acq_parameters);
DLOG(INFO) << "acquisition(" << acquisition_fpga_->unique_id() << ")";

121
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fpga.cc
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@ -75,6 +75,13 @@ pcps_acquisition_fpga::pcps_acquisition_fpga(pcpsconf_fpga_t conf_) : gr::block(
d_total_block_exp = acq_parameters.total_block_exp;
d_make_2_steps = acq_parameters.make_2_steps;
d_num_doppler_bins_step2 = acq_parameters.num_doppler_bins_step2;
d_doppler_step2 = acq_parameters.doppler_step2;
d_doppler_center_step_two = 0.0;
d_doppler_max = acq_parameters.doppler_max;
acquisition_fpga = std::make_shared<fpga_acquisition>(acq_parameters.device_name, acq_parameters.code_length, acq_parameters.doppler_max, d_fft_size,
acq_parameters.fs_in, acq_parameters.sampled_ms, acq_parameters.select_queue_Fpga, acq_parameters.all_fft_codes, acq_parameters.excludelimit);
}
@ -104,7 +111,7 @@ void pcps_acquisition_fpga::init()
d_mag = 0.0;
d_input_power = 0.0;
d_num_doppler_bins = static_cast<uint32_t>(std::ceil(static_cast<double>(static_cast<int32_t>(acq_parameters.doppler_max) - static_cast<int32_t>(-acq_parameters.doppler_max)) / static_cast<double>(d_doppler_step))) + 1;
d_num_doppler_bins = static_cast<uint32_t>(std::ceil(static_cast<double>(static_cast<int32_t>(d_doppler_max) - static_cast<int32_t>(-d_doppler_max)) / static_cast<double>(d_doppler_step))) + 1;
acquisition_fpga->init();
}
@ -167,34 +174,17 @@ void pcps_acquisition_fpga::send_negative_acquisition()
this->message_port_pub(pmt::mp("events"), pmt::from_long(2));
}
void pcps_acquisition_fpga::set_active(bool active)
void pcps_acquisition_fpga::acquisition_core(uint32_t num_doppler_bins, uint32_t doppler_step, uint32_t doppler_min)
{
d_active = active;
// initialize acquisition algorithm
uint32_t indext = 0U;
float firstpeak = 0.0;
float secondpeak = 0.0;
uint32_t total_block_exp;
d_input_power = 0.0;
d_mag = 0.0;
uint64_t initial_sample;
int32_t doppler;
DLOG(INFO) << "Channel: " << d_channel
<< " , doing acquisition of satellite: " << d_gnss_synchro->System << " " << d_gnss_synchro->PRN
<< " ,sample stamp: " << d_sample_counter << ", threshold: "
<< d_threshold << ", doppler_max: " << acq_parameters.doppler_max
<< ", doppler_step: " << d_doppler_step
// no CFAR algorithm in the FPGA
<< ", use_CFAR_algorithm_flag: false";
uint64_t initial_sample;
acquisition_fpga->configure_acquisition();
acquisition_fpga->set_doppler_sweep(d_num_doppler_bins);
acquisition_fpga->set_doppler_sweep(num_doppler_bins, doppler_step, doppler_min);
acquisition_fpga->write_local_code();
acquisition_fpga->set_block_exp(d_total_block_exp);
acquisition_fpga->run_acquisition();
@ -207,7 +197,8 @@ void pcps_acquisition_fpga::set_active(bool active)
d_total_block_exp = total_block_exp;
}
doppler = -static_cast<int32_t>(acq_parameters.doppler_max) + d_doppler_step * (d_doppler_index - 1);
//doppler = -static_cast<int32_t>(d_doppler_max) + d_doppler_step * (d_doppler_index - 1);
doppler = static_cast<int32_t>(doppler_min) + doppler_step * (d_doppler_index - 1);
if (secondpeak > 0)
{
@ -239,19 +230,91 @@ void pcps_acquisition_fpga::set_active(bool active)
d_gnss_synchro->Acq_delay_samples = static_cast<double>(indext);
d_gnss_synchro->Acq_samplestamp_samples = d_sample_counter; // delay due to the downsampling filter in the acquisition
}
}
if (d_test_statistics > d_threshold)
void pcps_acquisition_fpga::set_active(bool active)
{
d_active = active;
d_input_power = 0.0;
d_mag = 0.0;
DLOG(INFO) << "Channel: " << d_channel
<< " , doing acquisition of satellite: " << d_gnss_synchro->System << " " << d_gnss_synchro->PRN
<< " ,sample stamp: " << d_sample_counter << ", threshold: "
<< d_threshold << ", doppler_max: " << d_doppler_max
<< ", doppler_step: " << d_doppler_step
// no CFAR algorithm in the FPGA
<< ", use_CFAR_algorithm_flag: false";
acquisition_core(d_num_doppler_bins, d_doppler_step, -d_doppler_max);
if (!d_make_2_steps)
{
d_active = false;
send_positive_acquisition();
d_state = 0; // Positive acquisition
if (d_test_statistics > d_threshold)
{
d_active = false;
send_positive_acquisition();
d_state = 0; // Positive acquisition
}
else
{
d_state = 0;
d_active = false;
send_negative_acquisition();
}
}
else
{
d_state = 0;
d_active = false;
send_negative_acquisition();
if (d_test_statistics > d_threshold)
{
d_doppler_center_step_two = static_cast<float>(d_gnss_synchro->Acq_doppler_hz);
acquisition_core(d_num_doppler_bins_step2, d_doppler_step2, d_doppler_center_step_two - static_cast<float>(floor(d_num_doppler_bins_step2 / 2.0)) * d_doppler_step2);
if (d_test_statistics > d_threshold)
{
d_active = false;
send_positive_acquisition();
d_state = 0; // Positive acquisition
}
else
{
d_state = 0;
d_active = false;
send_negative_acquisition();
}
}
else
{
d_state = 0;
d_active = false;
send_negative_acquisition();
}
}
// if (d_test_statistics > d_threshold)
// {
// // if (!d_make_2_steps)
// // {
// d_active = false;
// send_positive_acquisition();
// d_state = 0; // Positive acquisition
// // }
// // else
// // {
// // d_doppler_center_step_two = static_cast<float>(d_gnss_synchro->Acq_doppler_hz);
// // acquisition_core(d_num_doppler_bins_step2, d_doppler_step2, d_doppler_center_step_two - static_cast<float>(floor(d_num_doppler_bins_step2 / 2.0)) * d_doppler_step2);
// // }
// }
// else
// {
// d_state = 0;
// d_active = false;
// send_negative_acquisition();
// }
}

12
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fpga.h
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@ -64,6 +64,9 @@ typedef struct
float downsampling_factor;
uint32_t total_block_exp;
uint32_t excludelimit;
bool make_2_steps;
uint32_t num_doppler_bins_step2;
float doppler_step2;
} pcpsconf_fpga_t;
class pcps_acquisition_fpga;
@ -94,6 +97,8 @@ private:
float first_vs_second_peak_statistic(uint32_t& indext, int32_t& doppler, uint32_t num_doppler_bins, int32_t doppler_max, int32_t doppler_step);
void acquisition_core(uint32_t num_doppler_bins, uint32_t doppler_step, uint32_t doppler_max);
pcpsconf_fpga_t acq_parameters;
bool d_active;
float d_threshold;
@ -104,6 +109,7 @@ private:
int32_t d_state;
uint32_t d_channel;
uint32_t d_doppler_step;
uint32_t d_doppler_max;
uint32_t d_fft_size;
uint32_t d_num_doppler_bins;
uint64_t d_sample_counter;
@ -115,6 +121,10 @@ private:
uint32_t d_total_block_exp;
bool d_make_2_steps;
uint32_t d_num_doppler_bins_step2;
float d_doppler_step2;
float d_doppler_center_step_two;
public:
~pcps_acquisition_fpga();
@ -187,7 +197,7 @@ public:
*/
inline void set_doppler_max(uint32_t doppler_max)
{
acq_parameters.doppler_max = doppler_max;
d_doppler_max = doppler_max;
acquisition_fpga->set_doppler_max(doppler_max);
}

32
src/algorithms/acquisition/libs/fpga_acquisition.cc
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@ -216,12 +216,13 @@ void fpga_acquisition::set_block_exp(uint32_t total_block_exp)
d_map_base[11] = total_block_exp;
}
void fpga_acquisition::set_doppler_sweep(uint32_t num_sweeps)
void fpga_acquisition::set_doppler_sweep(uint32_t num_sweeps, uint32_t doppler_step, uint32_t doppler_min)
{
float phase_step_rad_real;
float phase_step_rad_int_temp;
int32_t phase_step_rad_int;
int32_t doppler = static_cast<int32_t>(-d_doppler_max);
//int32_t doppler = static_cast<int32_t>(-d_doppler_max);
int32_t doppler = static_cast<int32_t>(doppler_min);
float phase_step_rad = GPS_TWO_PI * (doppler) / static_cast<float>(d_fs_in);
// The doppler step can never be outside the range -pi to +pi, otherwise there would be aliasing
// The FPGA expects phase_step_rad between -1 (-pi) to +1 (+pi)
@ -239,7 +240,8 @@ void fpga_acquisition::set_doppler_sweep(uint32_t num_sweeps)
d_map_base[3] = phase_step_rad_int;
// repeat the calculation with the doppler step
doppler = static_cast<int32_t>(d_doppler_step);
//doppler = static_cast<int32_t>(d_doppler_step);
doppler = static_cast<int32_t>(doppler_step);
phase_step_rad = GPS_TWO_PI * (doppler) / static_cast<float>(d_fs_in);
phase_step_rad_real = phase_step_rad / (GPS_TWO_PI / 2);
if (phase_step_rad_real >= 1.0)
@ -264,30 +266,6 @@ void fpga_acquisition::configure_acquisition()
}
void fpga_acquisition::set_phase_step(uint32_t doppler_index)
{
float phase_step_rad_real;
float phase_step_rad_int_temp;
int32_t phase_step_rad_int;
int32_t doppler = -static_cast<int32_t>(d_doppler_max) + d_doppler_step * doppler_index;
float phase_step_rad = GPS_TWO_PI * (doppler) / static_cast<float>(d_fs_in);
// The doppler step can never be outside the range -pi to +pi, otherwise there would be aliasing
// The FPGA expects phase_step_rad between -1 (-pi) to +1 (+pi)
// The FPGA also expects the phase to be negative since it produces cos(x) -j*sin(x)
// while the gnss-sdr software (volk_gnsssdr_s32f_sincos_32fc) generates cos(x) + j*sin(x)
phase_step_rad_real = phase_step_rad / (GPS_TWO_PI / 2);
// avoid saturation of the fixed point representation in the fpga
// (only the positive value can saturate due to the 2's complement representation)
if (phase_step_rad_real >= 1.0)
{
phase_step_rad_real = MAX_PHASE_STEP_RAD;
}
phase_step_rad_int_temp = phase_step_rad_real * POW_2_2; // * 2^2
phase_step_rad_int = static_cast<int32_t>(phase_step_rad_int_temp * (POW_2_29)); // * 2^29 (in total it makes x2^31 in two steps to avoid the warnings
d_map_base[3] = phase_step_rad_int;
}
void fpga_acquisition::read_acquisition_results(uint32_t *max_index,
float *firstpeak, float *secondpeak, uint64_t *initial_sample, float *power_sum, uint32_t *doppler_index, uint32_t *total_blk_exp)
{

4
src/algorithms/acquisition/libs/fpga_acquisition.h
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@ -60,9 +60,9 @@ public:
bool init();
bool set_local_code(uint32_t PRN);
bool free();
void set_doppler_sweep(uint32_t num_sweeps);
void set_doppler_sweep(uint32_t num_sweeps, uint32_t doppler_step, uint32_t doppler_max);
void run_acquisition(void);
void set_phase_step(uint32_t doppler_index);
void read_acquisition_results(uint32_t *max_index, float *firstpeak, float *secondpeak, uint64_t *initial_sample, float *power_sum, uint32_t *doppler_index, uint32_t *total_blk_exp);
void block_samples();

1
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking_fpga.cc
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@ -1323,6 +1323,7 @@ int dll_pll_veml_tracking_fpga::general_work(int noutput_items __attribute__((un
d_state = 2;
DLOG(INFO) << "Number of samples between Acquisition and Tracking = " << acq_trk_diff_samples << " ( " << acq_trk_diff_seconds << " s)";
std::cout << "Number of samples between Acquisition and Tracking = " << acq_trk_diff_samples << " ( " << acq_trk_diff_seconds << " s)" << std::endl;
DLOG(INFO) << "PULL-IN Doppler [Hz] = " << d_carrier_doppler_hz
<< ". PULL-IN Code Phase [samples] = " << d_acq_code_phase_samples;