NAME

       gnss-sdr - GNSS Software Defined Receiver.

SYNOPSIS

       gnss-sdr -c=<path-to-configuration-file> [OPTION]...

DESCRIPTION

       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.

       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.

       There is some flexibility in how flags may be specified. The following examples are equivalent:

               gnss-sdr -c=/home/user/rx.conf

               gnss-sdr --c=/home/user/rx.conf

               gnss-sdr -c /home/user/rx.conf

               gnss-sdr --c /home/user/rx.conf

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.

SEE ALSO

       volk_gnsssdr_profile(1)

       Examples of configuration files available at: ${prefix}/share/gnss-sdr/conf, where ${prefix} uses to be
       /usr or /usr/local.

       Check https://gnss-sdr.org for more information.

BUGS

       Please report bugs at https://github.com/gnss-sdr/gnss-sdr/issues

AUTHOR

       Carles Fernandez-Prades (carles.fernandez@cttc.es)

       This software package has been developed at CTTC (Centre Tecnologic de Telecomunicacions de Catalunya,
       https://www.cttc.cat) with contributions from around the world.

0.0.20                                             1 Apr 2025                                        gnss-sdr(1)