What is gpsfake?

Posted on by Dominique Stacey

What is gpsfake?

gpsfake is a test harness for gpsd and its clients. It opens a pty (pseudo-TTY), launches a gpsd instance that thinks the slave side of the pty is its GNSS device, and repeatedly feeds the contents of one or more test logfiles through the master side to the GNSS receiver.

How does gpsd work?

gpsd provides a TCP/IP service by binding to port 2947 by default. It communicates via that socket by accepting commands, and returning results. gpsd supports interfacing with the Network Time Protocol (NTP) server ntpd via shared memory to enable setting the host platform’s time via the GPS clock.

What is GPS daemon?

gpsd is a service daemon that monitors one or more GPSes or AIS receivers attached to a host computer through serial or USB ports, making all data on the location/course/velocity of the sensors available to be queried on TCP port 2947 of the host computer.

How do I exit Gpsmon?

Quit gpsmon. Control-C, or whatever your current interrupt character is, works as well. (Direct mode only.)

How accurate is gpsd?

The GPS unit is normally accurate to within two meters Circular Error Probability (CEP), and the accuracy is further increased through algorithms built into GPS Insight. Analysis of the GPS information provided by GPS Insight yields an accuracy rate of approximately 99.88%.

How can I tell if a GPS is running?

To check if your device is ready to be used by gpsd try running lsof(8) and search the output for your GPS device path (for example lsof -n | grep /dev/ttyUSB0 ). If something is listed in the output you’ll have to stop these processes and reconfigure them to ignore your GPS device.

How do I start a GPS?

How can I automatically launch GPSD on startup?

  1. sudo killall gpsd.
  2. Remove any sockets gpsd might have left behind with :
  3. Check the device path: dmesg – which shows PLU353.
  4. Ensure no other programs are using the device.
  5. Manually launch gpsd : sudo gpsd /dev/ttyUSB0 -F /var/run/gpsd.sock.

How far off can GPS be?

That’s compared to today’s GPS solutions, which typically have a range of three to five meters, or up to 16 feet away. That relatively large error range is what can make it so hard for your phone to tell if you’re on a highway or an offramp, or if you’ve made a turn or continued forward.

How accurate is Gpsd?

How do I start gpsd daemon?