关键词: GPS, P码直捕, XFAST, 均值法

Abstract:

In order to ensure the high anti-interference ability of the GPS system,we need to achieve rapid GPS P-Code acquisition.This article studies the enforceability of the P-code direct acquisition and the algorithms of XSFAST,mean value and Doppler frequency domain compensation.The mean value method is improved and combined with XFAST method to realize coherent accumulation in the frequency domain.Simulation shows that this method is more conducive to hardware implementation.

Key words: GPS;Direct GPS P-Code acquisition;XFAST;Fast direct GPS P-Code acquisition