FFT在导航信号捕获中的应用分析

Application Analysis of FFT in Navigation Signal Acquisition

针对伪码捕获过程中,传统的滑动相关捕获方法存在捕获时间长,捕获精度低等问题,选择了将FFT应用于伪码捕获中,提高了捕获的时间以及速度。并对两种方法进行分析比较和仿真验证,证实了FFT的使用大大减少了捕获时间,提高了捕获速度。最后对于在FFT捕获过程中的问题,提出了一些改进措施。

Aiming at the problem that the traditional sliding correlation acquisition method has long capture time and low acquisition precision in the process of pseudo-code acquisition,the FFT is applied to the acquisition of PN code,and the acquisition time and accuracy are improved.The analysis and comparison of the two methods and the simulation results show that the FFT method greatly reduces the acquisition time and improves the acquisition speed.Finally,some improvement measures are put forward in the process of FFT acquisition.