Method for demodulating PSK modulated signals

摘要

The present invention is a method for demodulating a PSK modulated signal wherein the PSK system incorporates a transmitter generating a PSK modulated signal and wherein the transmitter is crystal based. A crystal based receiver receives the PSK modulated signal and the delta phase between the recovered PSK signal and a receiver generated reference signal is measured; the measurement is repeated with a predetermined phase shift. Voltage values are derived representing the results of each of the measurements and are applied to an analog-to-digital converter to derive digital values representing the two phases measured, and a corresponding delta phase. The digital values are applied to a look up table to derive a phase correction for the reference signal, and several methods are described to perform various types of PSK demodulation.