高动态环境下的伪码快捕方法综述

对部分伪码快捕方法进行了综述,详细介绍了其中一种方法:基于FFT的伪码快速捕获。阐述了这种方法的原理:以频域的快速傅里叶变换来等价完成时域的循环卷积,实现在一个伪码周期内同时搜索所有的码相位单元。分析表明,该方法能很大程度地缩短捕获时间,满足系统实时性和高精度的要求,可以用于导弹导航定位。

Rapid Acquisition of PN Signals in Dynamic Situation

Several approaches for PN code rapid acquisition operation was summarized at first,and a mode called New Fast GPS code-acquisition technique using FFT is presented,which uses FFT instead of circular search to finish searching all phase cells of PN signal once in one cycle.The analyses show that this method can make the acquisition-time decreased and have the advantages of real time and higher precision,which may be used for navigation and positioning of missle.