New GPS weak signal high-sensitivity acquisition algorithm

Abstract

The algorithm of weak Global Positioning System(GPS) signal capture was analyzed,and the coherent accumulation and non-coherent accumulation capture algorithm's signal model and detecting probability model were built.In order to improve the performance of GPS signal acquisition when strong and weak signals both exist,this paper put forward a method of SPRT(Sequential Probability Ratio Test) to capture the GPS signal.This method with coherent accumulation and non-coherent accumulation capture algorithm in detecting probability and time complexity was compared and simulated.Through theoretical analysis and computer simulation,the SPRT method is proved of high detecting probability.It can effectively reduce the detection time when strong and weak signals both exist,and improve the performance of GPS weak signal acquisition.