FIELD: radio engineering.
SUBSTANCE: invention relates to radio engineering field, and particularly to radio navigation with using of signals of satellite navigation system and can be used in signal processing tracts of multi-systemic recipient of navigation system, operating by signals of satellite navigation systems. Method of un-codec signals of satellite navigation systems in channel with closed code is described by that it includes operations: reception, intensification, down conversion and filtration of signals of satellites in frequency receive chain L1 with following of Doppler effects of bearing, reduced by means of open codes, followed by delay, measurements of Doppler frequencies of different satellites by means of servoloops of phase-locked loop, operation of receiving, intensification, conversion of frequency and signal filtering of satellites in frequency receive chain L2, modulation suppression by closed code with duplication of frequencies of all operating satellites by means of multiplication of quadrature projections of frequency signal L2, binary quantisation of analog signal of intermediate frequency of frequency receive chain L2, signal extraction of difference frequency by means of multibit digital low-pass filter, multiplication of codes of these difference frequencies, code character inverting of multiplication by sine sign of the second auxiliary frequency, additional filtration by multibit digital low-pass filter before feeding on inlet of servoloop bank. Device contains signal receive chain of frequency L1 with accessible code, analog highway of frequency receive chain L2 with closed code, binary quantiser of analog signal of intermediate frequency, three inverter of entry code character, code generator of sine and cosine of the first auxiliary frequency, three multibit digital filters of lower frequencies, multibit multiplier, generator of sine character of the second auxiliary frequency, bank of servoloop of locked-loop sustem.
EFFECT: following of carrier frequency of channels of satellite navigation system with closed codes and measurement of Doppler frequencies.
2 cl, 2 dwg
