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"""
gps_l1_ca_read_telemetry_dump.py
gps_l1_ca_read_telemetry_dump (filename)
Open and read GNSS-SDR telemetry binary log files (.dat) into Python, and
return the contents.
Irene Pérez Riega, 2023. iperrie@inta.es
Args:
filename - Path to file telemetry[N].dat with the raw data
Return:
telemetry - A dictionary with the processed data
-----------------------------------------------------------------------------
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
def gps_l1_ca_read_telemetry_dump(filename):
double_size_bytes = 8
int_size_bytes = 4
bytes_shift = 0
tow_current_symbol_ms = []
tracking_sample_counter = []
tow = []
nav_simbols = []
prn = []
f = open(filename, 'rb')
if f is None:
return None
else:
while True:
f.seek(bytes_shift, 0)
tow_current_symbol_ms.append(struct.unpack(
'd', f.read(double_size_bytes))[0])
bytes_shift += double_size_bytes
f.seek(bytes_shift, 0)
tracking_sample_counter.append(struct.unpack(
'Q', f.read(double_size_bytes))[0])
bytes_shift += double_size_bytes
f.seek(bytes_shift, 0)
tow.append(struct.unpack(
'd', f.read(double_size_bytes))[0])
bytes_shift += double_size_bytes
f.seek(bytes_shift, 0)
nav_simbols.append(struct.unpack(
'I', f.read(int_size_bytes))[0])
bytes_shift += int_size_bytes
f.seek(bytes_shift, 0)
prn.append(struct.unpack('I', f.read(int_size_bytes))[0])
bytes_shift += int_size_bytes
f.seek(bytes_shift, 0)
# Check file
linea = f.readline()
if not linea:
break
telemetry = {
'tow_current_symbol_ms': tow_current_symbol_ms,
'tracking_sample_counter': tracking_sample_counter,
'tow': tow,
'nav_simbols': nav_simbols,
'prn': prn
}
return telemetry
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