METHOD OF NAVIGATION SIGNAL SEARCH Russian patent published in 2011 - IPC H04B1/00 

FIELD: physics.

SUBSTANCE: proposed method comprises formation and memorisation of complex samples of cross-correlation function for several analysed delay positions, execution of fast Fourier transform for all combinations of data symbols, including those with their shifted limits, non-coherent summation and isolation of one combination that features maximum accumulated signal magnitude. All combinations of signal sequences are shifted in frequency to new frequencies shifted relative to initial medium frequency of indeterminacy interval up and down by quarter interval of indeterminacy. One half of spectral components adjoining the shifted frequencies are taken of all spectral components at output of fast Fourier transform. For every spectral component, maximum signal magnitude is selected for all combinations of data symbols. Selected signals are used to compile the table to determine the most probably combination of frequency, delay and phase of digital data symbol of received signal and to refine frequency and delay magnitudes.

EFFECT: higher efficiency of search, reduced volume of memory for non-coherent accumulation.

3 dwg