For a primer on how GPS works:
https://timeandnavigation.si.edu/mul...-does-gps-work
Quote:
Originally Posted by aWanderlustSeoul
*GPS satellites send their positions to receivers on the ground every second. For the purpose of this example, we are comparing position difference over a longer period of time.
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This is incorrect. Multiple GPS Satellites are sending a constant stream of data far in excess of once per second. The receiver is decoding and making calculations based on a constellation of some number of satellite streams.
https://en.wikipedia.org/wiki/GPS_signals
The GPS receiver chip may be sending NMEA sentences to the CPU at 1 Hz, but often times now that can be 5, 10, or even 20 Hz. It depends on the application and how they program the positioning receiver chipset. uBLOX makes some great low-cost GPS/GNSS receivers.
https://www.u-blox.com/en/product/neo-m8u-module
And they can be VERY accurate in both position and speed depending on the type of receiver and the software used to interpret the data.
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