Abstract:  The code shift keying(CSK) modulated signal can support high data rate and meet the development needs for GNSS centimeter-level high-precision service.Thus,CSK modulated signal is attracting more and more attention.However,CSK modulated signal is usually only used in navigation message broadcast,but not ranging.To solve this problem,the tracking method for CSK modulated signal was studied,and two methods were proposed by tradeoff between performance and implementation complexity.Method one had high tracking accuracy with high implementation complexity,and method two reduced the implementation complexity at the cost of losing tracking accuracy.The tracking performance of the proposed methods was verified by theory and simulation.The results show that method one can provide the equivalent tracking performance to BPSK signal when C/N0 is higher than 40dB-Hz.Compared with method one,the required correlator resources by method two are reduced by 50%,but tracking performance of method two suffers 4dB degradation.The research results of this paper can provide a reference for the application of CSK modulated signal in GNSS high-precision signal design.

Key words: CSK modulated signal, high data rate, symbol error rate(SER), tracking error, global navigation satellite system(GNSS)