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Accelerated Evaluation of Spread Spectrum Signals Synchronization Parameters

For satellite radio navigation systems, an accelerated digital algorithm for estimating the synchronization parameters of spread spectrum signals is considered: time delay, carrier frequency, and initial frequency phase. Signals of both a traditional structure and signals on non-harmonic subcarriers - binary, which corresponds to BOC (binary offset carrier modulated) signals, and multi-position, i.e. MOC (multi position offset carrier modulated) signals are considered. The novelty of the developed approach is the use of an accelerated algorithm for calculating the cross section of the real part of the uncertainty function of a spread spectrum signal along the time axis, taking into account the structure of the used pseudorandom sequence using the generalized fast Fourier transform. It is shown that the accuracy of time synchronization is significantly increased in the case of MOC-signals, due to weaker fluctuations of the real part of their autocovariance functions in the region of the main peak, in comparison with the other types of signals considered.