高动态GPS接收机的信号跟踪方法及实现

A Signal Tracking Technique and Implementation for High Dynamic GPS Receiver

鉴于航天和遥感领域的GPS接收机工作于高动态环境,提出基于锁频环(FLL)和锁相环(PLL)相结合的载波跟踪方法,讨论了通过延时伪码锁定环结合载波辅助技术进行伪码跟踪的原理,并通过分析载波环路的跟踪误差和测量门限给出了环路带宽的取值。在Matlab下对跟踪方案完成了系统级的软件仿真,同时在基于FPGA&DSP的接收机平台上完成了硬件实现,并进行了实际测试。软件仿真的结果和硬件系统的测试结果都证明了该跟踪方法的正确性。

Considering the GPS receiver works in high dynamic circumstance,a new technique of carrier tracking,which combining FLL with PLL,is presented in this paper.The pseudo noise code tracking theory through digital delay-locked loop and carrier assistant technology is discussed.Finally,the tracking technique is simulated under Matlab environment and implemented on GPS hardware receiver which is designed based on FPGA and DSP.The results of simulation and hardware testing confirm that the technique is right.