Research On Synchronization Algorithm Of BOC Signal In Satellite Navigation System

The satellite navigation had widely been used in the social economic and national defense.In the meantime different regions and countries were carrying out the satellite navigation system construction.It made navigation signal spectrum resources increasingly scarce,so we took the BOC modulation mode in order to solve the problem in the new generation of navigation system and GPS modernization.Now people pay more attention to this new modulation method.In this background the paper studied the features of BOC modulation signal and summarized the synchronization algorithm and then researched the capture performance including the capture time,detection probability,false alarm probability,the capture sensitivity.The paper proposed a adaptive threshold capture strategy facing complex environment which based on appropriate detector design parameters and code phase parallel algorithm.This paper focused on discussing BOC(2n,n)autocorrelation function based on FFT phase code capture algorithm and phase parallel capture algorithm,and deeply researched the correspondence between self-correlation and cross-correlation features of BOC(2n,n)modulating signal.On the basis of research above the paper put forward the modified algorithm which reconstruct the correlation function to minify the vice peak efficiently.At the end of the article the paper described the platform producing intermediate frequency signal simulation and designed the software signal receiver platform to simulate the algorithms above.