[slicktux]

Thanks for the reply; did not think about that and after all that is the crucial characteristic of what allows GPS to work: now does it depend on the GPS module? Or can phase and Doppler shift be accesses regardless of the device?

[dvdbloc]

Every consumer GPS receiver I have seen and even some aerospace-grade receivers that I have (limited) experience with report data over a serial connection as “NMEA sentences”. You can read about them here: https://www.gpsinformation.org/dale/nmea.htm#nmea if it’s a USB GPS receiver, it’s likely internally a USB->serial chip with a GPS receiver communicating over serial. The data that I have seen is always been high-level focused on navigation such as speed in MPH and heading in degrees and of course, long and lag. Not to say that you can’t find a device that reports phase and Doppler shift, this is just how everything I have seen worked. When GPS receivers started getting cheap when I was a kid, I was very excited to experiment with them using Arduinos, etc so hope this helps!

[slicktux]

Thank you for the information! I will be giving this a read! Can’t wait!

[JensRex]

If you want to do anything with GPS modules, some fine and talented people have done the hard work of interfacing with, and parsing the output of a lot of different receivers, and called it `gpsd`.

https://gpsd.gitlab.io/gpsd/index.html

[lultimouomo]

It definitely depends on the device. You can find a lot of information about Doppler GPS in speed record communities on the internet, e.g. in this speed surfing record tracker:

https://www.gps-speedsurfing.com/default.aspx?mnu=item&item=...

[slicktux]

Another excellent reply! Thank you! This will definitely come in handy for personal projects; like autonomous robots; it helps to have redundant systems and it seems that GPS is more accurate than odometry or accelerometers that suffer from drift