基于中频采样率的伪码跟踪环性能分析与仿真

Analysis and Simulation of the Tracking Performance of Different Intermediate Frequency Sampling Rate

本文对GPS接收机中伪码跟踪过程建立了数学模型,分析了中频采样时钟对码环跟踪性能的影响。通过动态仿真,模拟了FPGA中码跟踪环在多种条件下(多普勒,环境噪声,初始码相位偏移)的同步与跟踪。理论分析和仿真结果表明,中频采样率直接影响接收机码环的跟踪精度,成为影响码环工作性能的一个重要因素。

In the paper,the mathematic model of pseudorange tracking process is established and the influence of many intermediate frequency samplings on the tracking performance of code loops is analyzed.It also dynamically emulates the synchronization and tracking of DLL on many occasions.It mainly deals with the tracking performance of different intermediate frequency sampling rate in digital GPS receiver tracking loop.