Frequency modulator for digital transmissions, used for precise determination of the position of a mobile using GPS

摘要

The method includes the step of modulating the central carrier frequency (f0) of one of the frequency values to the during a time (T) in successive frequency steps. The number of frequency steps for proceeding from f0-1/4T to f0+1/4T is the same as for proceeding from f0+1/4T to f0-1/4T.