gnss-sdr1

Usage

Overview

gnss-sdr is a Global Navigation Satellite Systems Software Defined Receiver written in C++. It implements all the signal processing chain, taking as input raw samples coming from the output of an Analog-to-Digital Converter, and processing them up to the computation of the Position-Velocity-Time solution, including the generation of code and phase measurements. .TP gnss-sdr is able to work with raw data files or, if there is computational power enough, in real time with suitable radio frequency front-ends. The whole receiver is defined in a single configuration file, and therefore users can define theirs. .TP There is some flexibility in how flags may be specified. The following examples are equivalent: .RS 8 .TP gnss-sdr -c=/home/user/rx.conf .TP gnss-sdr --c=/home/user/rx.conf .TP gnss-sdr -c /home/user/rx.conf .TP gnss-sdr --c /home/user/rx.conf .RE

Options

gnss-sdr takes the following options:

-c=<path-to-configuration-file> or -config_file=<path-to-configuration-file>

Set the configuration file. This flag is mandatory.

-s=<path-to-raw-signal-file> or -signal_source=<path-to-raw-signal-file>

If defined, path to the file containing the signal samples (overrides the data file specified in the configuration file).

-log_dir=<path-to-directory>

If defined, overrides the default directory where logs are saved.

-doppler_max=<doppler_max>

If defined, maximum Doppler value in the search grid, in Hz (overrides the configuration file).

-doppler_step=<doppler_step>

If defined, sets the frequency step in the search grid, in Hz (overrides the configuration file).

-cn0_samples=<samples>

Number of correlators outputs (one per integration time) used for CN0 estimation. It defaults to 20 outputs.

-cn0_min=<cn0_min>

Minimum valid CN0 (in dB-Hz). It defaults to 25 dB-Hz. If set, it overrides the configuration file.

-max_lock_fail=<max_lock_fail>

Maximum number of lock failures before dropping a satellite. It defaults to 50 failures. If set, it overrides the configuration file.

-carrier_lock_th=<carrier_lock_th>

Carrier lock error threshold (in rad). It defaults to 0.85 rad (48.7 degrees). If set, it overrides the configuration file.

-dll_bw_hz=<dll_bw_hz>

If defined, bandwidth of the DLL low pass filter, in Hz (overrides the configuration file).

-pll_bw_hz=<pll_bw_hz>

If defined, bandwidth of the PLL low pass filter, in Hz (overrides the configuration file).

-RINEX_version=<version>

If defined, specifies the RINEX version (2.11 or 3.02). Default: "3.02". Overrides the configuration file.

-version

Print program version and exit.

-help

Print all the available commandline flags and exit.