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gpssubframe(1)                 GPSD Documentation                 gpssubframe(1)




NAME

       gpssubframe - tool to dump subframe sentences from gpsd


SYNOPSIS

       gpssubframe [OPTIONS] [server[:port[:device]]]

       gpssubframe -h

       gpssubframe -V


DESCRIPTION

       gpssubframe is a tool to connect to gpsd and dump decoded subframe data
       to stdout. This is only useful if your GNSS receiver can output GPS
       subframe messages, and is configured to do so. A working knowledge of
       IS-GPS-200 is also required. Keep your copy close at hand.

       gpssubframe does not require root privileges, but will run fine as root.
       It can be run concurrently with other tools connecting to the local gpsd
       without causing problems.

       The program will accumulate subframe messages and output them by GPS
       satellite number on exit. By default the program never exits unless the
       user selects the number of seconds to run or number of messages to
       capture.

       By default gpssubframe connects to a gpsd running on the local host.
       Optionally a host, TCP/IP port number and remote device can be given.


OPTIONS

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

       -c COUNT, --count COUNT
           Exit after COUNT subframe messages.

       -D DEBUG, --debug DEBUG
           Set level of debug. Must be integer. Default 0.

       --desc
           Print long descriptions.

       --device DEVICE
           Connect to device DEVICE on gpsd host.

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

       --file FILE
           Read gpsd JSON from FILE instead of from gpsd..

       --host HOST
           Connect to gpsd on host HOST.

       --load LOADFILE
           Load saved JSON Subframe, TPV, and RAW data trom LOADFILE.

       -n COUNT, --count COUNT
           Count of messages to parse. 0 to disable.

       --port PORT
           Connect to gpsd on port PORT.

       --progress
           Print progress reports as messages are received.

       --satpos
           Compute GPS satellite positions before exit.  If --time is given, the
           positions will be calculated at the time.  Otherwise if a RAW message
           was received, the measurement time in that message will be used.  The
           last resort is to use the time from the last TPV message is used.

       --save SAVEFILE
           Save decoded Subframe data in SAVEFILE as JSON.  If present, the last
           TPV and RAW JSON records will also be saved.

       --test
           Run --satpos selftest code.

       --time SEC
           Compute satellite position at time SEC in POSIX seconds.

       -V, --version
           Print the program version, then exit.

       -x SEC, --seconds SEC
           Seconds of messages to parse. 0 to disable.


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

       First configure a u-blox 9-series to output subframe messages. Then have
       gpssubframe gather one complete set of subframes, then print the data
       organized by GPS satellite number.  Be sure to replace -P 22 with the
       correct protocol version for your receiver. Then calculate and print the
       known satellite positions as well as the azimuth, elevation, and range
       from the current position:

           ubxtool -P 22 -e SFRBX
           gpssubframe -x 750 --satpos

       If staring at a blank screen for 12.5 minutes is too stressful, then
       enable progress messages:

           gpssubframe -x 750 --satpos --progress


RETURN VALUES

       0
           on success.

       1
           on failure


SEE ALSO

       gpsd(8), gps(1), gpsprof(1), gpsfake(1).

       IS-GPS-200 "NAVSTAR GPS Space Segment/Navigation User Segment Interfaces"


RESOURCES

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


COPYING

       This file is Copyright 2020 by the GPSD project
       SPDX-License-Identifier: BSD-2-clause


AUTHOR

       Gary E. Miller



GPSD Version 3.24                  2021-09-20                     gpssubframe(1)

mgpsd 3.24 - Generated Sun Jan 1 11:05:55 CST 2023
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