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"""
gps_l1_ca_kf_read_tracking_dump.py
Read GNSS-SDR Tracking dump binary file into Python.
Opens GNSS-SDR tracking binary log file .dat and returns the contents in a dictionary
gps_l1_ca_kf_read_tracking_dump(filename)
Args:
filename - Path to file .dat with the raw data
Return:
GNSS_tracking - A dictionary with the processed data in lists
Irene Pérez Riega, 2023. iperrie@inta.es
-----------------------------------------------------------------------------
GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
This file is part of GNSS-SDR.
Copyright (C) 2022 (see AUTHORS file for a list of contributors)
SPDX-License-Identifier: GPL-3.0-or-later
-----------------------------------------------------------------------------
"""
import struct
import sys
def gps_l1_ca_kf_read_tracking_dump(filename):
bytes_shift = 0
GNSS_tracking = {}
v1 = []
v2 = []
v3 = []
v4 = []
v5 = []
v6 = []
v7 = []
v8 = []
v9 = []
v10= []
v11 = []
v12 = []
v13 = []
v14 = []
v15 = []
v16 = []
v17 = []
v18 = []
v19 = []
v20 = []
v21 = []
v22 = []
if sys.maxsize > 2 ** 36: # 64 bits computer
float_size_bytes = 4
unsigned_long_int_size_bytes = 8
double_size_bytes = 8
unsigned_int_size_bytes = 4
else: # 32 bits
float_size_bytes = 4
unsigned_long_int_size_bytes = 4
double_size_bytes = 8
unsigned_int_size_bytes = 4
f = open(filename, 'rb')
if f is None:
help(gps_l1_ca_kf_read_tracking_dump)
return None
else:
while True:
f.seek(bytes_shift, 0)
# VE -> Magnitude of the Very Early correlator.
v1.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# E -> Magnitude of the Early correlator.
v2.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# P -> Magnitude of the Prompt correlator.
v3.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# L -> Magnitude of the Late correlator.
v4.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# VL -> Magnitude of the Very Late correlator.
v5.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# promp_I -> Value of the Prompt correlator in the
# In-phase component.
v6.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# promp_Q -> Value of the Prompt correlator in the
# Quadrature component.
v7.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# PRN_start_sample -> Sample counter from tracking start.
if unsigned_long_int_size_bytes == 8:
v8.append(struct.unpack(
'Q', f.read(unsigned_long_int_size_bytes))[0])
bytes_shift += unsigned_long_int_size_bytes
else:
v8.append(struct.unpack(
'I', f.read(unsigned_int_size_bytes))[0])
bytes_shift += unsigned_int_size_bytes
f.seek(bytes_shift, 0)
# acc_carrier_phase_rad - > Accumulated carrier phase, in rad.
v9.append(struct.unpack('f', f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# carrier doppler hz -> Doppler shift, in Hz.
v10.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# carrier doppler rate hz s -> Doppler rate, in Hz/s.
v11.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# code freq hz -> Code frequency, in chips/s.
v12.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# code_freq_rate_hz_s -> Code frequency rate, in chips/s².
#todo carr_error in gps_l1_ca_kf_read_tracking_dump.m
v13.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# carr_error -> Raw carrier error (unfiltered) at the PLL
# output, in Hz.
#todo carr_noise_sigma2 in gps_l1_ca_kf_read_tracking_dump.m
v14.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# carr_nco -> Carrier error at the output of the PLL
# filter, in Hz.
v15.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# code error -> Raw code error (unfiltered) at the DLL
# output, in chips.
v16.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# code nco -> Code error at the output of the DLL
# filter, in chips.
v17.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# CN0_SNV_dB_Hz -> C/N0 estimation, in dB-Hz.
v18.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# carrier lock test -> Output of the carrier lock test.
v19.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# var 1 -> not used ?
v20.append(struct.unpack('f',
f.read(float_size_bytes))[0])
bytes_shift += float_size_bytes
f.seek(bytes_shift, 0)
# var 2 -> not used ?
v21.append(struct.unpack('d',
f.read(double_size_bytes))[0])
bytes_shift += double_size_bytes
f.seek(bytes_shift, 0)
# PRN -> Satellite ID.
v22.append(struct.unpack('I',
f.read(unsigned_int_size_bytes))[0])
bytes_shift += unsigned_int_size_bytes
f.seek(bytes_shift, 0)
linea = f.readline()
if not linea:
break
f.close()
GNSS_tracking['VE'] = v1
GNSS_tracking['E'] = v2
GNSS_tracking['P'] = v3
GNSS_tracking['L'] = v4
GNSS_tracking['VL'] = v5
GNSS_tracking['prompt_I'] = v6
GNSS_tracking['prompt_Q'] = v7
GNSS_tracking['PRN_start_sample'] = v8
GNSS_tracking['acc_carrier_phase_rad'] = v9
GNSS_tracking['carrier_doppler_hz'] = v10
GNSS_tracking['carrier_doppler_rate_hz2'] = v11 #todo segun el dll es carrier_doppler_rate_hz_s
GNSS_tracking['code_freq_hz'] = v12
GNSS_tracking['carr_error'] = v13 #todo code_freq_rate_hz_s segun dll
GNSS_tracking['carr_noise_sigma2'] = v14 #todo carr_error segun dll
GNSS_tracking['carr_nco'] = v15
GNSS_tracking['code_error'] = v16
GNSS_tracking['code_nco'] = v17
GNSS_tracking['CN0_SNV_dB_Hz'] = v18
GNSS_tracking['carrier_lock_test'] = v19
GNSS_tracking['var1'] = v20
GNSS_tracking['var2'] = v21
GNSS_tracking['PRN'] = v22
return GNSS_tracking
|
