基于分段串行匹配滤波结合FFT的快速捕获方法研究与FPGA实现

随着GPS现代化的进行和我国北斗2卫星导航系统的发展完善,特别是GPS L5和北斗B3等长码的应用,传统的捕获方法消耗资源过大或者捕获时间过长,已经很难适应需要。在保证快速捕获的前提下,提出了一种分段串行匹配滤波结合FFT快速捕获的方法,有效的减少了资源的消耗和缩短了捕获时间。首先分析了这种捕获算法的原理和理论推导,并说明了其关键技术的实现。然后和其他两种捕获算法对比分析了SPMF-FFT捕获算法的优劣。最后通过研究该算法的性质,来说明该算法关键参数的设置。

Research and FPGA implementation of rapid code acquisitionmethod based on serial matching filter and FFT

With the improvement and development of the GPS modernization program and the Beidou satellite navigation system, especially the application of GPS L5 and Beidou B3 long pseudo-code, the traditional acquisition method which needs high resource consumption or long capture time is already difficult to adaptation. Under the premise of the rapid acquisition , the paper put forward the serial partial matching filter-fast Fourier transformation method, which is effectively reduce the consumption of resources and shorten the acquisition time. Firstly, this paper analyzes the principle and the theory of the method, and explains the key technology to the realize it. Then the MATLAB simulation and modesim simulation shows the feasibility and validity of the method. Finally, the study of the method illustrate the key parameters of the algorithm.