METHOD AND DEVICE FOR EXTRACTING INFORMATION ABOUT DOPPLER SHIFT OF SIGNAL CARRIER FREQUENCY Russian patent published in 2004 - IPC

FIELD: communications engineering; information and measurement devices.

SUBSTANCE: proposed method that can be used for extracting information about Doppler shift of signal carrier frequency in information and measurement devices without a priori information about modulating message using two-position frequency keying due to quadrature separation of input signal relative to center frequency rating with low-frequency filtration of cophasal and quadrature components and generation of complex signal from filtered-off components includes signal division into two equal components, frequency conversion of both components followed by low-frequency filtration, multiplication of filtered-off signals, and calculation of Fourier transform with respect to signal; in the process frequency of one signal component is converted in phase relative to signal center frequency rating and that of other component, in quadrature relative to same frequency; each of converted-frequency signal components converted is filtered in low frequency band, complex signal with real part equal to filtered-off cophasal signal and imaginary part equal to filtered-off quadrature signal are generated; Fourier-transform image of generated complex signal is calculated; argument of maximum of Fourier-transform image of signal is found in region of negative frequencies and argument of maximum of Fourier-transform image of signal, in region of positive frequencies; Doppler signal carrier frequency shift is obtained as half-sum of found maxima of arguments. Device implementing proposed method has splitter, first mixer , first low-band filter, second mixer, second low-band filter, Fourier-transform processor, heterodyne, phase shifter, and arithmetic unit.

EFFECT: enlarged functional capabilities.

2 cl, 1 dwg