Parallel acquisition algorithm in time-frequency domain

Due to the fact that the classic method of parallel acquisition in the time or frequency domain cannot satisfy the demand of the fast acquisition of the direct sequence/frequency hopping(DS/FH) hybrid spread spectrum signal in TT&C. In order to further improve the acquisition accuracy of the carrier, on the basis of the partial match filter-fast fourier transform(PMF-FFT) algorithm, a parallel algorithm in the time-frequency domain with feedback architecture was proposed. Through the coarse estimation of the carrier frequency offset by the PMF-FFT algorithm, the new algorithm uses the Quinn frequency interpolation algorithm to improve the estimation accuracy of frequency offset, modifying the local carrier by employing the estimated result and reacquiring. Theoretical analysis and simulation results show that, compared to the PMF-FFT algorithm, the new method improves acquisition accuracy of the carrier, under the conditions of large frequency offset and low SNR, increases the frequency analysis bandwidth, and reduces the average acquisition time.