Patent ID: 7903765

Claim:
A method for demodulating a signal of multiple frequency manipulation with equidistant frequency spreading, comprising: forming an array of adjustable frequencies from f 1 to f m for exact adjusting of said frequency spreading, where m is a maximum number of the frequencies in the signal of multiple frequency manipulation with equidistant frequency spreading f p =kf t , where f t is a clock frequency, k=1, 2, . . . an initial frequency values in the array being allocated in such regions, where exact values of a frequency of a received signal could be situated; demodulating the received signal using the array; while receiving the received signal, extracting maximum values in modulus of the received signal on all frequencies f i (i=1, . . . , m) switched with the clock frequency f t to obtain switched maximum values; extracting the clock frequency f t from the switched maximum values of the received signal for exact adjusting the frequency spreading f p to the clock frequency f t ; tuning the array of adjustable frequencies with the frequency spreading adjusted to the exact values of the received signal frequency; wherein demodulating the received signal occurs by coherently receiving the received signal using only one of the quadrature channels for ascertaining the presence or absence of a signal of a particular frequency from said exact frequency values.