Post: GPS uses doppler shift rather than positioning
GPS uses doppler shift rather than positioning →
Posted Friday 26th October 2007 13:21 GMT
In California teen offers GPS challenge to speeding rap
As most gps units do not rely on position to calculate speed the accuracy (even discounting dodgy weather conditions etc) is usually +/- 0.5mph
A quick search for 'gps speedometer doppler' will explain.
