Satellite signal acquisition algorithm based on correlated SFFT

In GPS(Global Positioning System)receivers, commonly used acquisition methods are time-domain serial acquisition methods, FFT(Fast Fourier Transform)-based parallel frequency acquisition methods and FFT-based parallel code phase acquisition methods, but in certain application scenarios,it will put forward higher requirements on the acquisition speed of satellite signals, so a satellite signal fast acquisition algorithm based on correlated SFFT (Sparse Fast Fourier Transform) is given. This algorithm combined the strong autocorrelation characteristic of the satellite signal pseudo-random code, removed the original SFFT amplitude estimate, and used the time-domain serial capture method to convert the local pseudo-corresponding to the large-valued coordinate points output by the SFFT algorithm The code is correlated with the received satellite signal to capture the satellite signal. The algorithm is verified through experiments and compared with the existing satellite signal acquisition methods. The results show that the method can be effectively used in satellite signal acquisition, and the calculation amount of the algorithm is lower than the traditional acquisition algorithm.