GPS软件接收机全系统仿真

Whole System Simulation of GPS Software Receiver

在模块化设计架构下,利用Simulink模块产生等效GPS中频信号,引入真实GPS信号导航电文、伪距等信息模拟接收机钟差和钟漂,使中频信号更接近实际情况。通过仿真分析几种常用载波跟踪环路优缺点,找到一种最合适的频率跟踪环路,由环路得到的伪距等信息用最小二乘技术完成定位,从而实现整个GPS接收机系统纯软件仿真。仿真结果表明,该仿真有效、可行。

This paper uses Simulink module to generate equivalent GPS IF signal instead of real signal,adding messages of real pseudo range and rate for simulate receiver’s time difference and bias.All baseband signal processing procedures are carefully investigated,the performance of FLL are discussed in details.An optimized method is chosen into the model.An absolute receiver is completed by least squares method.Simulation results show the availability and reliability of the software receiver and a whole receiver system can be finished by software simulation.