DIGITAL DEVICE FOR PROCESSING POLYPHASE ORTHOGONAL CODIPHASE SIGNALS Russian patent published in 2009 - IPC G06F17/14 

FIELD: physics; radio.

SUBSTANCE: invention relates to radio engineering and may be used in radar stations in target tracking modes to process polyphase pulse codiphase signals of unknown Doppler frequency encoded with orthogonal code ensembles. Technical effect - reduced amount of calculations required to decode polyphase pulse signals and to determine Doppler frequency by using fast Vilenkin-Krestenson-Fourier transformation (FVK-FT), which utilises combined FFT algorythm in Vilenkin-Krestenson basis and discrete exponent functions. This provides for simultaneous decoding of polyphase pulse signals encoded with Vilenkin-Krestenson orthogonal function ensembles and determination of Doppler frequency in limited Doppler frequency range according to preliminary target designation. FVK-FT processor algorithm is determined by multiplication of N×N signal pulses matrix of pulse parameters for signal encoded with Vilenkin-Krestenson function ensemble by each row of NxN matrix of discrete exponent functions. Resulting N²×N matrix is a set of pulse parameter N×N matrices for various frequencies defined by discrete exponent function matrix.

EFFECT: reduced amount of calculations required to decode polyphase pulse signals and to determine Doppler frequency, which provides for simultaneous decoding of polyphase pulse signals encoded with Vilenkin-Krestenson orthogonal function ensembles and determination of Doppler frequency in limited Doppler frequency range according to preliminary target designation.

2 cl, 4 dwg