GPS软件接收机捕获和跟踪算法研究

Research on Acquisition and Tracking in Software GPS Receiver

研究了GPS软件接收机的捕获和跟踪算法,并在matlab平台上实现了GPS软件接收机,实现了快速的基于循环卷积的并行捕获算法,得到了可见卫星的初始相位和多普勒频移。使用了超前滞后环和对相位反转不敏感的科斯塔斯环分别对码相位和多普勒频移进行跟踪,成功解调出导航电文。

Acquisition and tracking algorithms for GPS software receiver were studied and a software-defined GPS receiver was implemented on MATLAB platform. A fast parallel acquisition algorithm based on cyclic convolution was implemented , the visible satellites and coarse values of carrier frequency and code phase of the satellite signals are got. Early-later code tracking loop and Costas phase lock loop were used to track codephase and Doppler frequency shift, respectively. So the navigation data could be demodulated.