I'm looking into a time marker modulated onto a rf carrier that is simple and at the same time accurate. The marker on the low frequency signal carrying the US time reference which is said to invert the carrier to mark the time certainly sounds simple. The remarkable accuracy of the RTK GPS devices, actual inches are claimed, suggests a very accurate means of reading the time marker. Anyone know of a text that deals with such circuitry or perhaps a schematic of a gps reciever with enough detail to show how it's done?
Hul