A method for improving the precision of Doppler-Shift estimation in PMF-FFT algorithm

This paper aims at the lack of precision of the Doppler-shift estimation in PMF-FFT algorithm under limited hardware resource,and proposes a new method,which is PMF-FFT-based two round parallel searches with three frequency-points linear fitting.Starting from analysis of precision of the Doppler-shift estimation of PMF-FFT based acquisition,the paper elaborates the solution to improve the precision by adding few hard resources.Simulation results show that the new method could improve the precision of the Doppler-shift estimation under low SNR.