GNSS-SDR  0.0.19
An Open Source GNSS Software Defined Receiver
gps_l1_ca_dll_pll_tracking_gpu_cc.h
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1 /*!
2  * \file gps_l1_ca_dll_pll_tracking_gpu_cc.h
3  * \brief Implementation of a code DLL + carrier PLL tracking block, GPU ACCELERATED
4  * \author Javier Arribas, 2015. jarribas(at)cttc.es
5  *
6  * Code DLL + carrier PLL according to the algorithms described in:
7  * K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.H.Jensen,
8  * A Software-Defined GPS and Galileo Receiver. A Single-Frequency Approach,
9  * Birkhauser, 2007
10  *
11  * -----------------------------------------------------------------------------
12  *
13  * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
14  * This file is part of GNSS-SDR.
15  *
16  * Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
17  * SPDX-License-Identifier: GPL-3.0-or-later
18  *
19  * -----------------------------------------------------------------------------
20  */
21 
22 #ifndef GNSS_SDR_GPS_L1_CA_DLL_PLL_TRACKING_GPU_CC_H
23 #define GNSS_SDR_GPS_L1_CA_DLL_PLL_TRACKING_GPU_CC_H
24 
25 #include "cuda_multicorrelator.h"
26 #include "gnss_block_interface.h"
27 #include "gnss_synchro.h"
28 #include "tracking_2nd_DLL_filter.h"
29 #include "tracking_FLL_PLL_filter.h"
30 #include <gnuradio/block.h>
31 #include <fstream>
32 #include <map>
33 #include <string>
34 #include <vector>
35 
36 /** \addtogroup Tracking
37  * \{ */
38 /** \addtogroup Tracking_gnuradio_blocks
39  * \{ */
40 
41 
42 class Gps_L1_Ca_Dll_Pll_Tracking_GPU_cc;
43 
44 using gps_l1_ca_dll_pll_tracking_gpu_cc_sptr = gnss_shared_ptr<Gps_L1_Ca_Dll_Pll_Tracking_GPU_cc>;
45 
46 gps_l1_ca_dll_pll_tracking_gpu_cc_sptr
47 gps_l1_ca_dll_pll_make_tracking_gpu_cc(
48  int64_t fs_in,
49  uint32_t vector_length,
50  bool dump,
51  std::string dump_filename,
52  float pll_bw_hz,
53  float dll_bw_hz,
54  float early_late_space_chips);
55 
56 
57 /*!
58  * \brief This class implements a DLL + PLL tracking loop block
59  */
60 class Gps_L1_Ca_Dll_Pll_Tracking_GPU_cc : public gr::block
61 {
62 public:
63  ~Gps_L1_Ca_Dll_Pll_Tracking_GPU_cc();
64 
65  void set_channel(uint32_t channel);
66  void set_gnss_synchro(Gnss_Synchro *p_gnss_synchro);
67  void start_tracking();
68 
69  int general_work(int noutput_items, gr_vector_int &ninput_items,
70  gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
71 
72  void forecast(int noutput_items, gr_vector_int &ninput_items_required);
73 
74 private:
75  friend gps_l1_ca_dll_pll_tracking_gpu_cc_sptr
76  gps_l1_ca_dll_pll_make_tracking_gpu_cc(
77  int64_t fs_in,
78  uint32_t vector_length,
79  bool dump,
80  std::string dump_filename,
81  float pll_bw_hz,
82  float dll_bw_hz,
83  float early_late_space_chips);
84 
85  Gps_L1_Ca_Dll_Pll_Tracking_GPU_cc(
86  int64_t fs_in,
87  uint32_t vector_length,
88  bool dump,
89  std::string dump_filename,
90  float pll_bw_hz,
91  float dll_bw_hz,
92  float early_late_space_chips);
93  void update_local_code();
94  void update_local_carrier();
95  void check_carrier_phase_coherent_initialization();
96 
97  // PLL and DLL filter library
98  Tracking_2nd_DLL_filter d_code_loop_filter;
99  Tracking_FLL_PLL_filter d_carrier_loop_filter;
100 
101  Gnss_Synchro *d_acquisition_gnss_synchro;
102 
103  std::vector<gr_complex> d_Prompt_buffer;
104 
105  // file dump
106  std::string d_dump_filename;
107  std::ofstream d_dump_file;
108 
109  std::map<std::string, std::string> systemName;
110  std::string sys;
111 
112  // tracking configuration vars
113  int64_t d_if_freq;
114  int64_t d_fs_in;
115  double d_early_late_spc_chips;
116  uint32_t d_vector_length;
117  uint32_t d_channel;
118  int32_t d_n_correlator_taps;
119 
120  // GPU HOST PINNED MEMORY IN/OUT VECTORS
121  cuda_multicorrelator *multicorrelator_gpu;
122  gr_complex *in_gpu;
123  gr_complex *d_correlator_outs;
124  gr_complex *d_ca_code;
125  float *d_local_code_shift_chips;
126 
127  gr_complex *d_Early;
128  gr_complex *d_Prompt;
129  gr_complex *d_Late;
130 
131  // remaining code phase and carrier phase between tracking loops
132  double d_rem_code_phase_samples;
133  double d_rem_code_phase_chips;
134  double d_rem_carrier_phase_rad;
135 
136  // acquisition
137  double d_acq_code_phase_samples;
138  double d_acq_carrier_doppler_hz;
139 
140  // tracking vars
141  double d_code_freq_chips;
142  double d_code_phase_step_chips;
143  double d_carrier_doppler_hz;
144  double d_carrier_phase_step_rad;
145  double d_acc_carrier_phase_cycles;
146  double d_code_phase_samples;
147  double d_pll_to_dll_assist_secs_Ti;
148 
149  // Integration period in samples
150  int32_t d_correlation_length_samples;
151 
152  // processing samples counters
153  uint64_t d_sample_counter;
154  uint64_t d_acq_sample_stamp;
155 
156  // CN0 estimation and lock detector
157  double d_carrier_lock_test;
158  double d_CN0_SNV_dB_Hz;
159  double d_carrier_lock_threshold;
160  int32_t d_carrier_lock_fail_counter;
161  int32_t d_cn0_estimation_counter;
162 
163  // control vars
164  bool d_acc_carrier_phase_initialized;
165  bool d_enable_tracking;
166  bool d_pull_in;
167  bool d_dump;
168 };
169 
170 
171 /** \} */
172 /** \} */
173 #endif // GNSS_SDR_GPS_L1_CA_DLL_PLL_TRACKING_GPU_CC_H
cuda_multicorrelator
Class that implements carrier wipe-off and correlators using NVIDIA CUDA GPU accelerators.
Definition: cuda_multicorrelator.h:111
Tracking_2nd_DLL_filter
This class implements a 2nd order DLL filter for code tracking loop.
Definition: tracking_2nd_DLL_filter.h:40
Gps_L1_Ca_Dll_Pll_Tracking_GPU_cc
This class implements a DLL + PLL tracking loop block.
Definition: gps_l1_ca_dll_pll_tracking_gpu_cc.h:60
Tracking_FLL_PLL_filter
This class implements a hybrid FLL and PLL filter for tracking carrier loop.
Definition: tracking_FLL_PLL_filter.h:29
Gnss_Synchro
This is the class that contains the information that is shared by the processing blocks.
Definition: gnss_synchro.h:38
gnss_block_interface.h
This interface represents a GNSS block.
tracking_2nd_DLL_filter.h
Interface of a 2nd order DLL filter for code tracking loop.
cuda_multicorrelator.h
Highly optimized CUDA GPU vector multiTAP correlator class.
tracking_FLL_PLL_filter.h
Interface of a hybrid FLL and PLL filter for tracking carrier loop.
gnss_synchro.h
Interface of the Gnss_Synchro class.
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