3 ms·
This isn't 1993 anymore. Beidou and Glonass (and Galileo) are global networks that do the same things for those other countries, and the ITAR restrictions on GP
by LeifCarrotson 4y ago
This isn't 1993 anymore. Beidou and Glonass (and Galileo) are global networks that do the same things for those other countries, and the ITAR restrictions on GPS receiver altitude and velocity are increasingly able to be overcome by a hobbyist in a garage, much less a nation-state.
- bluGill 4y agoIt doesn't matter - the speed of light in air varies by enough that no satellite can provide the needed accuracy alone.
- fsh 4y agoNot quite. Geodetic GNSS systems use two different carrier frequencies to measure and correct for atmospheric dispersion. This reduces the error to sub-mm levels. The inaccuracy of real-time GNSS is due to unknown variations of the satellite orbits, satellite clocks, and earth rotation.