FIELD: radio engineering and communications.
SUBSTANCE: invention relates to the field of radio engineering, in particular to the processing of signals of space radio navigation systems (SRNS), and is intended to increase the decoding accuracy of SRNS signals. Method comprises receiving and selecting at frequency fL1 unknown exact code GP(t)*GW(t) or P(Y) with known open code GC/A,k(t) or C/A in conditions of absence of data on initial phase of signal ϕI and Doppler frequency fDop. Further, the SRNS signal is converted at frequency fL1 in digital form SL1(n). Thereafter, Doppler frequency fDop signal at frequency fL1 and carrying the spectrum of the discrete real signal to zero frequency by digital heterodyning SGPS(n). Further, phase correction is measured ΔϕI and performing phase correction of the SRNS signal with isolation of quadratures containing only P(Y) code SIm(P(Y))GPS and only C/A code SRe(C/A)GPS. Open code is then decoded and the navigation message Ns(h) is read. At the same time, the closed code D(h) is decoded and a closed range-finding code D*(h) by subtracting the navigation message and extracting from it a cryptographically secure data sequence W(h) for each navigation satellite. Spectrum transfer of discrete real signal SL1(n) to zero frequency is performed by digital heterodyning. Separation of codes C/A and P(Y) by separate quadratures – by phase correction of signal by value of measured phase correction. Decoding of the closed code is carried out by threshold processing of selected quadrature of signal with tracking of boundary values of change of signal level SIm(P(Y))GPS. Cryptographically secure data sequence W(h) for each satellite is selected from convolution by multiplying modulo "2" of decoded sequence D(h), navigation message Ns(h) and open range-finding code P(h).
EFFECT: disclosed is a method of processing signals of space radio navigation systems.
5 cl, 6 dwg
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