GNSS-SDR  0.0.19
An Open Source GNSS Software Defined Receiver
glonass_l1_ca_dll_pll_c_aid_tracking_cc.h
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1 /*!
2  * \file glonass_l1_ca_dll_pll_c_aid_tracking_cc.h
3  * \brief Implementation of a code DLL + carrier PLL tracking block
4  * \author Gabriel Araujo, 2017. gabriel.araujo.5000(at)gmail.com
5  * \author Luis Esteve, 2017. luis(at)epsilon-formacion.com
6  * \author Damian Miralles, 2017. dmiralles2009(at)gmail.com
7  *
8  *
9  * Code DLL + carrier PLL according to the algorithms described in:
10  * K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.H.Jensen,
11  * A Software-Defined GPS and Galileo Receiver. A Single-Frequency
12  * Approach, Birkha user, 2007
13  *
14  * -----------------------------------------------------------------------------
15  *
16  * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
17  * This file is part of GNSS-SDR.
18  *
19  * Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
20  * SPDX-License-Identifier: GPL-3.0-or-later
21  *
22  * -----------------------------------------------------------------------------
23  */
24 
25 #ifndef GNSS_SDR_GLONASS_L1_CA_DLL_PLL_C_AID_TRACKING_CC_H
26 #define GNSS_SDR_GLONASS_L1_CA_DLL_PLL_C_AID_TRACKING_CC_H
27 
28 #include "gnss_synchro.h"
29 #include "tracking_2nd_DLL_filter.h"
30 #include "tracking_FLL_PLL_filter.h"
31 // #include "tracking_loop_filter.h"
32 #include "cpu_multicorrelator.h"
33 #include "gnss_block_interface.h"
34 #include <gnuradio/block.h>
35 #include <pmt/pmt.h>
36 #include <volk_gnsssdr/volk_gnsssdr_alloc.h> // for volk_gnsssdr::vector
37 #include <deque>
38 #include <fstream>
39 #include <map>
40 #include <string>
41 
42 /** \addtogroup Tracking
43  * \{ */
44 /** \addtogroup Tracking_gnuradio_blocks
45  * \{ */
46 
47 
48 class glonass_l1_ca_dll_pll_c_aid_tracking_cc;
49 
50 using glonass_l1_ca_dll_pll_c_aid_tracking_cc_sptr = gnss_shared_ptr<glonass_l1_ca_dll_pll_c_aid_tracking_cc>;
51 
52 glonass_l1_ca_dll_pll_c_aid_tracking_cc_sptr
53 glonass_l1_ca_dll_pll_c_aid_make_tracking_cc(
54  int64_t fs_in, uint32_t vector_length,
55  bool dump,
56  const std::string& dump_filename,
57  float pll_bw_hz,
58  float dll_bw_hz,
59  float pll_bw_narrow_hz,
60  float dll_bw_narrow_hz,
61  int32_t extend_correlation_ms,
62  float early_late_space_chips);
63 
64 
65 /*!
66  * \brief This class implements a DLL + PLL tracking loop block
67  */
68 class glonass_l1_ca_dll_pll_c_aid_tracking_cc : public gr::block
69 {
70 public:
71  ~glonass_l1_ca_dll_pll_c_aid_tracking_cc();
72 
73  void set_channel(uint32_t channel);
74  void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro);
75  void start_tracking();
76 
77  int general_work(int noutput_items, gr_vector_int& ninput_items,
78  gr_vector_const_void_star& input_items, gr_vector_void_star& output_items);
79 
80  void forecast(int noutput_items, gr_vector_int& ninput_items_required);
81 
82 private:
83  friend glonass_l1_ca_dll_pll_c_aid_tracking_cc_sptr
84  glonass_l1_ca_dll_pll_c_aid_make_tracking_cc(
85  int64_t fs_in, uint32_t vector_length,
86  bool dump,
87  const std::string& dump_filename,
88  float pll_bw_hz,
89  float dll_bw_hz,
90  float pll_bw_narrow_hz,
91  float dll_bw_narrow_hz,
92  int32_t extend_correlation_ms,
93  float early_late_space_chips);
94 
95  glonass_l1_ca_dll_pll_c_aid_tracking_cc(
96  int64_t fs_in, uint32_t vector_length,
97  bool dump,
98  const std::string& dump_filename,
99  float pll_bw_hz,
100  float dll_bw_hz,
101  float pll_bw_narrow_hz,
102  float dll_bw_narrow_hz,
103  int32_t extend_correlation_ms,
104  float early_late_space_chips);
105 
106  void msg_handler_preamble_index(const pmt::pmt_t& msg);
107 
108  void check_carrier_phase_coherent_initialization();
109 
110  int32_t save_matfile() const;
111 
112  volk_gnsssdr::vector<gr_complex> d_ca_code;
113  volk_gnsssdr::vector<float> d_local_code_shift_chips;
114  volk_gnsssdr::vector<gr_complex> d_correlator_outs;
115  volk_gnsssdr::vector<gr_complex> d_Prompt_buffer;
116 
117  Cpu_Multicorrelator multicorrelator_cpu;
118 
119  // PLL and DLL filter library
120  // Tracking_2nd_DLL_filter d_code_loop_filter;
121  Tracking_2nd_DLL_filter d_code_loop_filter;
122  Tracking_FLL_PLL_filter d_carrier_loop_filter;
123 
124  // symbol history to detect bit transition
125  std::deque<gr_complex> d_E_history;
126  std::deque<gr_complex> d_P_history;
127  std::deque<gr_complex> d_L_history;
128 
129  // file dump
130  std::string d_dump_filename;
131  std::ofstream d_dump_file;
132 
133  std::map<std::string, std::string> systemName;
134  std::string sys;
135 
136  // tracking configuration vars
137  Gnss_Synchro* d_acquisition_gnss_synchro;
138  int64_t d_fs_in;
139  double d_glonass_freq_ch;
140  double d_early_late_spc_chips;
141  uint32_t d_vector_length;
142  uint32_t d_channel;
143  int32_t d_n_correlator_taps;
144 
145  // remaining code phase and carrier phase between tracking loops
146  double d_rem_code_phase_samples;
147  double d_rem_code_phase_chips;
148  double d_rem_carrier_phase_rad;
149  int32_t d_rem_code_phase_integer_samples;
150 
151  // acquisition
152  double d_acq_code_phase_samples;
153  double d_acq_carrier_doppler_hz;
154 
155  // tracking vars
156  float d_dll_bw_hz;
157  float d_pll_bw_hz;
158  float d_dll_bw_narrow_hz;
159  float d_pll_bw_narrow_hz;
160  double d_code_freq_chips;
161  double d_code_phase_step_chips;
162  double d_carrier_doppler_hz;
163  double d_carrier_frequency_hz;
164  double d_carrier_frequency_old_hz;
165  double d_carrier_phase_step_rad;
166  double d_acc_carrier_phase_cycles;
167  double d_code_phase_samples;
168  double d_pll_to_dll_assist_secs_Ti;
169  double d_code_error_chips_Ti;
170  double d_code_error_filt_chips_s;
171  double d_code_error_filt_chips_Ti;
172  double d_carr_phase_error_secs_Ti;
173 
174  double d_preamble_timestamp_samples;
175  int32_t d_extend_correlation_ms;
176 
177  // Integration period in samples
178  int32_t d_correlation_length_samples;
179 
180  // processing samples counters
181  uint64_t d_sample_counter;
182  uint64_t d_acq_sample_stamp;
183 
184  // CN0 estimation and lock detector
185  int32_t d_cn0_estimation_counter;
186  double d_carrier_lock_test;
187  double d_CN0_SNV_dB_Hz;
188  double d_carrier_lock_threshold;
189  int32_t d_carrier_lock_fail_counter;
190 
191  bool d_enable_extended_integration;
192  bool d_preamble_synchronized;
193 
194  // control vars
195  bool d_enable_tracking;
196  bool d_pull_in;
197  bool d_acc_carrier_phase_initialized;
198 
199  bool d_dump;
200 };
201 
202 
203 /** \} */
204 /** \} */
205 #endif // GNSS_SDR_GLONASS_L1_CA_DLL_PLL_C_AID_TRACKING_CC_H
cpu_multicorrelator.h
High optimized CPU vector multiTAP correlator class.
Tracking_2nd_DLL_filter
This class implements a 2nd order DLL filter for code tracking loop.
Definition: tracking_2nd_DLL_filter.h:40
Cpu_Multicorrelator
Class that implements carrier wipe-off and correlators.
Definition: cpu_multicorrelator.h:37
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.
tracking_FLL_PLL_filter.h
Interface of a hybrid FLL and PLL filter for tracking carrier loop.
glonass_l1_ca_dll_pll_c_aid_tracking_cc
This class implements a DLL + PLL tracking loop block.
Definition: glonass_l1_ca_dll_pll_c_aid_tracking_cc.h:68
gnss_synchro.h
Interface of the Gnss_Synchro class.
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