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Carles Fernandez
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.\" Manpage for front-end-cal.
.\" Manpage for front\-end\-cal.
.\" Contact javier.arribas@cttc.es to correct errors or typos.
.TH front-end-cal 1 "15 Dec 2014" "0.0.1" "front-end-cal man page"
.TH front\-end\-cal 1 "15 Dec 2014" "0.0.1" "front\-end\-cal man page"
.SH NAME
\fBfront-end-cal\fR \- RF front-end center frequency and sampling rate calibration tool.
\fBfront\-end\-cal\fR \- RF front\-end center frequency and sampling rate calibration tool.
.SH SYNOPSIS
\fBfront-end-cal -config_file=\fR\fI<path-to-configuration-file>\fR [OPTION]...
\fBfront\-end\-cal \-config_file=\fR\fI<path\-to\-configuration\-file>\fR [OPTION]...
.SH DESCRIPTION
\fBfront-end-cal\fR is a calibration tool for some DVB-T receivers based on the Taiwan's Realtek RTL2832U chipset, sold in form of USB dongles that allow users to watch over-the-air DVB-T European broadcast television on their personal computers, to be used as GNSS front-ends.
\fBfront\-end\-cal\fR is a calibration tool for some DVB\-T receivers based on the Taiwan's Realtek RTL2832U chipset, sold in form of USB dongles that allow users to watch over\-the\-air DVB\-T European broadcast television on their personal computers, to be used as GNSS front\-ends.
\.TP
Normally, those devices send partially-decoded MPEG transport frames over the USB, but exploiting an undocumented mode of operation of the demodulator chip, the user is able to obtain raw I&Q samples, stream them through USB to a personal computer and then use \fBgnss-sdr\fR, turning the DVB-T receiver into a GNSS receiver and delivering position in real-time.
Normally, those devices send partially\-decoded MPEG transport frames over the USB, but exploiting an undocumented mode of operation of the demodulator chip, the user is able to obtain raw I&Q samples, stream them through USB to a personal computer and then use \fBgnss\-sdr\fR, turning the DVB\-T receiver into a GNSS receiver and delivering position in real\-time.
\.TP
The crystal oscillator that ships with the RTL2832U family devices exhibits limited accuracy to be used as a GNSS receiver front-end without previous calibration. \fBfront-end-cal\fR automatizes the algorithm proposed in [1], and it requires Internet access since it retrieves Assisted GPS data from SUPL servers.
The crystal oscillator that ships with the RTL2832U family devices exhibits limited accuracy to be used as a GNSS receiver front\-end without previous calibration. \fBfront\-end\-cal\fR implements the algorithm proposed in [1], and it requires Internet access since it retrieves Assisted GPS data from SUPL servers.
\.TP
\fBfront-end-cal\fR is able to work with raw data files or, if there is computational power enough, in real time with suitable radiofrequency front-ends. The whole receiver is defined in a single configuration file, and therefore users can define theirs.
\fBfront\-end\-cal\fR 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.
.SH OPTIONS
\fBfront-end-cal\fR takes the following options:
\fBfront\-end\-cal\fR takes the following options:
.TP
\fB-config_file=\fR\fI<path-to-configuration-file>\fR Set the configuration file.
\fB\-config_file=\fR\fI<path\-to\-configuration\-file>\fR Set the configuration file.
.TP
\fB-signal_source=\fR\fI<path-to-raw-signal-file>\fR If defined, path to the file containing the signal samples (overrides the data file specified in the configuration file).
\fB\-signal_source=\fR\fI<path\-to\-raw\-signal\-file>\fR If defined, path to the file containing the signal samples (overrides the data file specified in the configuration file).
.TP
\fB-log_dir=\fR\fI<path-to-directory>\fR If defined, overrides the default directory where logs are saved.
\fB\-log_dir=\fR\fI<path\-to\-directory>\fR If defined, overrides the default directory where logs are saved.
.TP
\fB-version\fR Print program version and exit.
\fB\-version\fR Print program version and exit.
.TP
\fB-help\fR Print all the available commandline flags and exit.
\fB\-help\fR Print all the available commandline flags and exit.
.SH SEE ALSO
.BR gnss-sdr (1), volk_gnsssdr_profile (1)
.BR gnss\-sdr (1), volk_gnsssdr_profile (1)
\.TP
Example of configuration file available at: ${prefix}/share/gnss-sdr/conf/front-end-cal.conf, where ${prefix}$ uses to be /usr or /usr/local. This will be the configuration file used by default if the \fB-config_file\fR option is not set.
Example of configuration file available at: ${prefix}/share/gnss\-sdr/conf/front\-end\-cal.conf, where ${prefix}$ uses to be /usr or /usr/local. This will be the configuration file used by default if the \fB\-config_file\fR option is not set.
\.TP
[1] C. Fernandez-Prades, J. Arribas, P. Closas, \fITurning a Television into a GNSS Receiver\fR, in Proceedings of ION GNSS+, 15-16 September 2013, Nashville, Tennessee (USA). A draft copy is freely available at http://www.cttc.es/publication/turning-a-television-into-a-gnss-receiver/
[1] C. Fernandez\-Prades, J. Arribas, P. Closas, \fITurning a Television into a GNSS Receiver\fR, in Proceedings of ION GNSS+, 15\-16 September 2013, Nashville, Tennessee (USA). A draft copy is freely available at http://www.cttc.es/publication/turning\-a\-television\-into\-a\-gnss\-receiver/
\.TP
Check http://gnss-sdr.org for more information.
Check http://gnss\\-sdr.org for more information.
.SH BUGS
No known bugs.
.SH AUTHOR