一种提高PMF-FFT捕获算法多普勒频偏估计精度的方法

摘要

针对PMF—FFT伪码捕获算法在硬件资源有限情况下提高多普勒频偏估计精度的问题，提出一种新的两轮搜索的方法一基于PMF—FFT-三频点线性拟合两轮并行搜索方法。文中从分析PMF—FFT捕获算法多普勒频偏估计精度问题入手．阐述了仅增加少量资源即可提高估计精度的两轮并行搜索新方法。最后仿真结果证明新方法能够在较低信噪比下提高多普勒频偏估计精度。%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-FFF-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.