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gpsrinex(1)                    GPSD Documentation                    gpsrinex(1)




NAME

       gpsrinex - Read data from gpsd convert to RINEX3 and save to a file.


SYNOPSIS

       gpsrinex [OPTIONS] [server[:port[:device]]]

       gpsrinex -h

       gpsrinex -V


DESCRIPTION

       gpsrinex is a tool to connect to gpsd and output the received raw
       measurements as a RINEX 3 observation file. This is useful for sending
       raw measurements (pseudorange and carrierphase) from gpsd to a Precise
       Point Positioning (PPP) program or service.

       gpsrinex does not require root privileges, but may be run as root.  Some
       of the examples in this file may not work when run under sudo.  It can be
       run concurrently with other tools connecting to a local or remote gpsd
       without causing problems.

       gpsrinex needs the GNSS receiver to be sending raw measurements to gpsd.
       Only a few GNSS have this capability. In addition, the gpsd driver for
       that GNSS must support raw mode. Currently only the u-blox driver has
       this support. Only a few u-blox 8 and 9 receivers implement the required
       UBX-RXM-RAWX message. The NEO-M8T is known to work, but requires
       configuration with ubxtool.

       Before using ubxtool be sure to set the UBXOPTS environment variable with
       the correct protocol version for your u-blox receiver. If your protocol
       version is 32.00, you would do this:

           export UBXOPTS="-P 32.00"

       RINEX has its own definitions and abbreviations. Be sure to consult their
       documentation. An observation file (.obs) contains data sets, called
       epochs, that contain the pseudorange and carrierphase for each satellite
       seen.

       gpsrinex by default will acquire 20 epochs spaced apart by 30 seconds.
       That will take 10 minutes to complete. Most users consider the 30 second
       interval to be optimal. Many PPP programs require at least 1 or 2 hours
       data, but no more than 24 or 48 hours of data. Most users consider 4 to 6
       hours of data as a minimum for good accuracy. Additional hours will not
       yield much improvement.

       The output will consist of one RINEX 3 observation file that is ready to
       be read by your PPP program. The default filename will be in the form:
       gpsrinexYYYYDDDDHHMM.obs. You can override this filename with the -f
       option.

       Optionally a server, TCP/IP port number and remote device can be given.
       If omitted, gpsrinex connects to localhost on the default port (2947) and
       watches all devices opened by gpsd.


OPTIONS

       -?, -h, --help
           Print a usage message and exit.

       -D LVL, -debug LVL
           Set debug level to LVL.

       -f OUTFILE, --fileout OUTFILE
           save RINEX into FILE.

       -F INFILE, --filein INFILE
           Read GPS JSON from file, not from a live gpsd.

       -i SECS, --interval SECS
           wait [interval] seconds between epochs. The interval can be specified
           to the millisecond. OPUS accepts intervals of 1, 2, 3, 5, 10, 15
           or,30 seconds. OPUS then reduces the data to 30 second intervals.
           Default is 30.000.

       -n COUNT, --count COUNT
           Causes COUNT epochs to be output. OPUS requires a minimum af 15
           minutes, and a maximum of 48 hours, of data.

       -V, --version
           makes gpsrinex print its version and exit.

       The following options set strings that are placed in the generated RINEX
       3 obs file. They do not change how gpsrinex computes anything.

       --agency AGENCY
           The name of the agency creating the current file.

       --ant_num NUMBER
           The antenna serial number.

       --ant_type TYPE
           The antenna type.

       --marker_name NAME
           The marker name.

       --marker_type TYPE
           The marker type

       --observer OBSERVER
           The name of the observer (you).

       --rec_num NUM
           The receiver serial number.

       --rec_type TYPE
           The receiver type.

       --rec_vers VERS
           The receiver version.

       The following options set floating point numbers that are placed in the
       generated RINEX 3 obs file. They do not change how gpsrinex computes
       anything.

       --ant_e EASTING
           The antenna easting from marker in meters.

       --ant_h HEIGHT
           The antenna height from marker in meters.

       --ant_n NORTHING
           The antenna northing from marker in meters.


ARGUMENTS

       By default, clients collect data from the local gpsd daemon running on
       localhost, using the default GPSD port 2947. The optional argument to any
       client may override this behavior: [server[:port[:device]]]

       For further explanation, and examples, see the ARGUMENTS section in the
       gps(1) man page


EXAMPLES

       Example 1:

       Create a 4 hour .obs file. With a running gpsd accessible on the
       localhost do all of the following, in order. Order matters.

       The raw measurement messages are long. Be sure your serial port speed is
       high enough:

           gpsctl -s 115200

       Disable all NMEA messages, and enable binary messages:

           ubxtool -d NMEA
           ubxtool -e BINARY

       The NEO-M8N will only reliably output raw measurements when only the GPS
       and QZSS constellations are enabled. If your PPP service can use GLONASS,
       then enable that as well. Be sure to disable, before enable, so as not to
       momentarily have too many constellations selected. ubxtool, as
       recommended by u-blox, enables the QZSS constellation in tandem with GPS.
       Disable all constellations, except GPS (and QZSS):

           ubxtool -d BEIDOU
           ubxtool -d GALILEO
           ubxtool -d GLONASS
           ubxtool -d SBAS
           ubxtool -e GPS

       Verify the constellations enabled:

           ubxtool -p CFG-GNSS

       Enable the good stuff, the raw measurement messages:

           ubxtool -e RAWX

       Verify raw data messages are being sent:

           ubxtool | fgrep RAWX

       You should see this output:

           UBX-RXM-RAWX:
           UBX-RXM-RAWX:

       Collect 4 hours of samples at 30 second intervals, save the RINEX 3
       observations in the file today.obs:

           gpsrinex -i 30 -n 480 -f today.obs

       Wait 4 hours. Enjoy a meal, or do some exercise. When gpsrinex finishes,
       upload the file today.obs to your favorite PPP service.

       Example 2:

       Collect raw measurement data from a remote gpsd. Then process it later
       with gpsrinex and gpsprof.

       Ensure the receiver is configured properly, as shown in Example 1.

       Grab 4 hours of raw live data from remote gpsd at 10.168.1.2:

           gpspipe -x 14400 -R 10.168.1.2 > 4h-raw.ubx

       When gpspipe is complete, feed the data to gpsfake:

           gpsfake -1 -P 3000 4h-raw.ubx

       In another window, feed the data to gpsrinex. Use -n 10000000 so that all
       the data from the raw file is used:

           gpsrinex -i 30 -n 1000000 :3000

       Repeat the process with gpsfake to send the data to gpsprof.


RETURN VALUES

       0
           on success.

       1
           on failure


SEE ALSO

       One service known to work with gbsrinex output is at:
       <https://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php>

       OPUS requires 2 frequency observation files.
       <https://www.ngs.noaa.gov/OPUS/>

       The curious can find the RINEX 3.04 format described here:
       <ftp://igs.org/pub/data/format/rinex304.pdf>

       gpsd(8), gps(1), gpsprof(1), gpsfake(1). ubxtool(1), gpsd_json(5)


RESOURCES

       Project web site:  <https://gpsd.io/>


COPYING

       This file is Copyright 2013 by the GPSD project
       SPDX-License-Identifier: BSD-2-clause


AUTHOR

       Gary E. Miller



GPSD, Version 3.25                 2023-01-10                        gpsrinex(1)

gpsd 3.25 - Generated Thu Feb 2 15:08:55 CST 2023
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