gpssubframe [OPTIONS] [server[:port[:device]]]
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.
- -?, -h, --help
-Print a usage message and exit.
- -c COUNT, --count COUNT
Exit after COUNT subframe messages.
- --device DEVICE
Connect to device DEVICE on gpsd host.
- -D LVL, --debug LVL
Set debug level to LVL.
- --file FILE
Read JSON from FILE instead of from gpsd..
- --host HOST
Connect to gpsd on host HOST.
- --port PORT
Connect to gpsd on port PORT.
Print progress reports as messages are received.
Compute GPS satellite positions before exit.
- --time SEC
Compute satellite position at time SEC in POSIX seconds.
Run --satpos selftest code.
- -V, --version
Print the program version, then exit.
- -x SEC, --seconds SEC
Seconds of messages to parse. 0 to disable.
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
gpsd(8), gps(1), gpsprof(1), gpsfake(1).
IS-GPS-200 "NAVSTAR GPS Space Segment/Navigation User Segment Interfaces"
This file is Copyright 2013 by the GPSD project SPDX-License-Identifier: BSD-2-clause