Research on burst signal acquisition algorithm of low earth orbit satellite

Low-orbit satellites have attracted wide attention from scholars due to their advantages of high received signal strength and low propagation path loss. At the same time, the problems of large Doppler frequency shift, low signal-to-noise ratio and limited visual time of low-orbit satellites make the acquisition of signals difficult. In this paper, a acquisition algorithm combining folding matched filtering and FFT is designed in high dynamic environment to capture burst signals, and compensate for large Doppler frequency and code phase offset. Finally, Matlab simulation is used to realize the successful acquisition of signals with Doppler frequency shift of ± 40kHz.