Research of Differential Correlation Acquisition Algorithm in GPS
Cai Chang-ting · Gnss World of China · 2006
GPS has been broadly applied in every fields of our social life.Since the environment around us has been becoming more and more complicated,the acquisition of GPS signals with low SNR gains more and more attention.This paper analyzes two common methods for improving the SNR of the test statistic: coherent integration and noncoherent integration,then points out their problems when used in low-SNR circumstance;differential correlation acquisition algorithm is introduced in detail,and its signal processing flow is modeled.With the help of MATLAB simulation,this paper investigates the effects of each parameter on the algorithm performance,and compares differential correlation acquisition algorithm with coherent / noncoherent integration algorithm.