Research And Implementation Of New Satellite Navigation Signal Acquisition Algorithm

With the development of global navigation satellite system and its wide application in various fields,the satellite navigation system in the new period puts forward higher requirements for the positioning accuracy,anti-jamming,anti-multipath and sensitivity of navigation system,which makes the original navigation signal band that is not well-offbecoming increasingly crowded.So based on the original binary phase shift key(Binary Phase Shift Key or BPSK)modulation,the Binary Offset Carrier(BOC)modulation rises gradually.The BOC signal uses a binary offset carrier modulation,which causes the energy of the spectrum to be moved from the carrier to the sides of the band.Thus,it solves the problem of band congestioneffectively and uses the band resources effectively,which achieve the goal that the additional signal and the original signal band sharing.Compared with the BPSK signal,the correlation peak of the autocorrelation function of the BOC modulation signal is much sharper.Therefore,BOC modulation signal can enhance the anti-jamming capability and anti-multipath capability,improve the code loop tracking accuracy.Since the BOC signal autocorrelation function has multi-peak characteristics,the capture result is ambiguous.However,the capture is an important part of the navigation and positioning,and the ambiguity of the new system satellite navigation signal captures has a direct impact on the efficiency of the navigation and positioning system.So we choose BOC modulation signal instead of fuzzy acquisition algorithm to start research.The main research on the new system of satellite navigation signal acquisition algorithm,focusing on BOC(m,n)signal blur-free acquisition algorithm to study.Firstly,we introduce the background and significance of the research in this paper,including the development status and trend of BOC signal without fuzzy acquisition algorithm;Then,the features and characteristics of BOC signal are studied,including BOC(m,n)signal generation,spectral structure,power spectral density and autocorrelation functions;The advantages and disadvantages of using BOC modulation technology are analyzed.Secondly,several commonly used new system satellite navigation signal acquisition algorithms are introduced.On this basis,a new fuzzy algorithm is proposed,which is combined with the traditional satellite navigation signal acquisition algorithm.In order to solve the problem of ambiguity caused by the new system acquisition algorithm,a BPSK-like acquisition algorithm for BOC(m,n)signal single sideband is proposed based on the deep analysis of BPSK-like acquisition algorithm,and gives the specific process of the improved signal acquisition algorithm and the process of accurate verification.According to the improved acquisition algorithm,the simulation is verified by Matlab.Finally,on the basis of the previous theoretical analysis and simulation,the improved capture algorithm is verified on the FPGA platform,which shown that the improved algorithm can solve the problem of secondary fault and multi-pair interference in the process of new satellite navigation signal acquisition effectively,which reduces the blurring degree and improves the capture precision.