METHOD TO DEMODULATE SIGNALS OF RELATIVE PHASE MODULATION AND DEVICE FOR ITS REALISATION Russian patent published in 2013 - IPC H04L27/22 H03D3/00 

FIELD: radio engineering, communications.

SUBSTANCE: method to demodulate signals of relative modulation consists in generation of a sequence of rectangular pulses Sn(t) from a filtered demodulated signal S(t), in generation of two reference sequences of rectangular pulses cn(t) and sn(t), corresponding to the sign of instantaneous values of in-phase cos(2πf₀t) and quadrature sin(2πf₀t) signals with frequency f₀, equal to the average frequency of the demodulated signal, in production of a generated sequence of rectangular pulses Sn(t) with specified reference sequences of rectangular pulses cn(t) and sn(t), accordingly, on duration T of each element of the demodulated signal S(t) of two correlation functions Y(t), X(t), in taking counts Y_n, X_n of the specified correlation functions, in using them for production of the phase "Ф"_n estimate on this n element of the signal S(t) with usage of the specified mathematical expression, in calculation of the absolute value of difference of phase |"Ф"_n-"Ф"_n-1| estimates.

EFFECT: increased noise immunity of relative modulation signals demodulation.

2 cl, 2 dwg