Research on Fast Capture Algorithms for PMF-FFT
Jiaming Wang, Weicheng Yu, Yiwei Peng, Pengcheng Yin, Bo Huang, Xie Ye · 2024
Aiming at the shortcomings of traditional capture algorithms in satellite carrier spread spectrum signal capture performance, a high-speed, highly dynamic parallel capture algorithm based on PMF-FFT is proposed. The mathematical model and improvement method of PMF-FFT are analyzed in detail, and the improved window function with a tuning factor of 1.712 is added to the PMF-FFT module. The simulation results show that the output gain attenuation and scallop loss of the capture system are greatly reduced, and the capture time of the algorithm is shortened to 45 ms. The capture performance of the algorithm is verified in an FPGA-based transponder, and the results show that the improved algorithm can shorten the capture time to 2 seconds in Doppler case.