Originally Posted by
FairWeatherFlyer
Are you saying that GPS can accurately calculate GS/VS/direction purely by observing the received, doppler-shifed-due-to-GPS-receiver-movement carrier frequencies from satellites? It would be interesting to read more about this if you have some reference material?
It is theoretically possible to measure velocity very accurately from GPS signals, but this requires significant processing power, compared to a normal GPS position fix. See:
https://www.researchgate.net/profile...4c78000000.pdf
http://researchbank.rmit.edu.au/eser...9492/Zhang.pdf
To date, with SA switched off and with the improvement of receiver technologies, velocities of a GPS user can be determined at an accuracy level of centimetres per second, which are several orders of magnitude higher than that of the positions. Moreover, the velocities can be measured at a relative high sampling rate, say from 10Hz to 100Hz
Whether your specific GPS receiver has this capability (outside of specialised surveys), is an entirely different question.
P.S. Thanks to @
futurama for pointing this out earlier in the thread.