高动态GPS接收机中伪码捕获问题研究

Research on Pseudorandom Code Acquisition in Dynamic GPS Receiver

设计在高动态环境下工作的GPS接收机,其难点之一便在于对卫星伪码的快速捕获。针对缩短GPS接收机捕获伪随机码时间的问题,在对GPS信号结构作出分析的前提下,解释了时域滑动相关的常规捕获方法;提出了基于FFT的快速捕获技术,并在M atlab环境下做了系统仿真,仿真结果显示捕获速度可以得到显著提高。

To design the GPS receiver working in high dynamic circumstaneet the first problem to be settled is how to catch the PN code of the satellite. In this paper, the common method of sliding window correlate is analyzed. In order to shorten the PN code acquitting time, the scheme based on FFT is also provided. The method is proved to be efficient in the emulator system.