GPS接收机中伪随机码快速捕获技术的研究

Study on Technique of Fast Acquisition Pseudo Noise Code in GPS Receiver

为缩短GPS接收机捕获伪随机码的时间 ,分析了与时域滑动相关的常规捕获方法 ;利用有效星历所提供的先验信息 ,对伪随机码的搜索范围进行压缩 ,缩短了伪随机码失锁重捕的时间 ;分析了采用FFT的快速捕获技术 .

In order to reduce the time of acquisition pseudo noise code in GPS receiver, the conventional acquisition method slide correlation in the time domain was analyzed. The searching range of pseudo noise code was narrowed utilizing to the information provided by epicheirema. The lost reacquisition time was shortened. The fast acquisition technique using FFT was analyzed. Simulation shows that the acquisition speed can be improved obviously.