摘要
Abstract
Different from the traditional satellite navigation system signal,the new generation of Beidou B2 frequency band navigation signal adopts the alternative binary offset carrier(AltBOC) modulation,so the performance of pseudo noise (PN) code tracking is different from the traditional signal system.Firstly,the principle and charateristics of AltBOC modulation signal are introduced.Then,according to the theory of code tracking precision,the performance difference is compared between the new modulation signal and the traditional signal,and the code tracking error of B2 frequency band signal is analyzed in different phase detectors.Finally,simulation analysis of PN code tracking error is also carried out under different correlator interval,loop bandwidth,front-end bandwidth,carrier to noise ratio conditions.Simulation results show that code tracking error can be reduced by improving the carrier to noise ratio and the RF front-end bandwidth,or decreasing the correlator interval and the loop bandwidth.The research results are significant for evaluating the performance of the new generation of Beidou navigation signal and the design of Beidou navigation receivers.关键词
“北斗”卫星导航系统/B2频段/AltBOC调制/码跟踪精度/前段带宽Key words
Beidou satellite navigation system/B2 frequency band/AltBOC modulation/code tracking error/front-end bandwidth分类
信息技术与安全科学
