Study On Synchronization Method Of New Navigation Signals In Compass

Compass satellite navigation system is a kind of important spatial information infrastructure,which is widely used in the society,military and scientific research.Satellite navigation signal which has a very unique and important position is the core of the link,and contacts space segment,ground segment and users segment.The traditional Compass navigation signal used QPSK(Quadrature Phase Shift Keying)modulation technique,but it without fully considering the particularity of distance and information transmission in satellite navigation system and solving the problem of crowded spectrum,etc.Thus the new navigation signals were developed,which used BOC(Binary Offset Carrier)family modulation signals.It has the characteristic of spectrum division and can effectively alleviate the problem of band resource shortage.Therefore,in the view of new high order BOC signal in B1 spectrum and AltBOC(Alternate Binary Offset Carrier)in B2 spectrum for the research of synchronization method.For Compass,the signal synchronization performance of the receiver was important.The synchronization was the precondition of the data processing.So,aiming at the problems of main and vice peak space is small and main and vice peak separation difficult,the vice peaks restraint with cross-correlation function(CFVR)algorithm is proposed.It takes advantage of the theory for correlation reconstruction,then the correlation function is shifted to achieve the purpose of the main peak and vice peak is restrained for BOC signal.Aiming at the problems of AltBOC signal is extremely complex and main peak recovery difficult,the correlation function reconstruction with orthogonal sub-carrier(OSCFR)algorithm is proposed.It takes advantage of the characteristics for the SCPC algorithm and the local orthogonal sub-carrier signal is introduced.Then the correlation function is early late processed to achieve the purpose of restrain vice peaks for AltBOC signal.Aiming at the multi-peak characteristics of BOC family modulation signals,the synchronization performance of algorithms are verified.First,the parameter and indicators are set and adaptability are analyzed.Then,from the perspective of vice peaks restraint and synchronization probability,the ratio of main peak and first vice peak,the ratio of main peak and maximum vice peak,the ratio of main peak and average vice peaks and correlation peak detection probability in different SNR are simulated and analyzed.On the basis,the main peak recovery ability,vice peak restraint ability and the correlation peak detection capability of the algorithms are verified by comparative analysis.