摘要
测距码在卫星导航系统中占据重要地位,北斗三号B1C信号和B2a信号测距码分别采用Weil码截短和Gold码增补的方式生成。探讨了北斗三号两种测距码的生成原理,基于FPGA实现了两种测距码数据分量主码的生成,并给出码生成仿真结果。基于传统相关定义,根据覆盖区域大小进行两种测距码相关性能的定性分析;引入奇/偶相关判据,利用最大相关旁瓣能量对两种测距码作相关性能的定量分析。基于定性与定量分析进行两种测距码的性能比较,结果表明,在码长同为10230的情况下,Weil码具有比Gold码更好的相关性能,更有利于卫星信号的捕获与跟踪。
The range codes made an important role in the satellite navigation system. In BeiDou Ⅲ, the B1C codes are created by using Weil codes via shift-and-cut construction, and the B2a codes are created by Gold codes via adding construction. This paper described the rationale and construction of these two ranging codes in BeiDou Ⅲ, generated these two ranging codes based on FPGA, and gave the simulation results. Based on the traditional correlation definition, the qualitative analysis of the correlation performance of two ranging codes was carried out according to the coverage area size. A quantitative analysis of the correlation performance of the two ranging codes was performed using the maximum correlation sidelobe energy. Based on qualitative and quantitative analysis for comparing the performance of the two kinds of ranging codes, the results show that in the case of codes length as 10230, Weil codes have a better correlation performance than Gold codes, and are more advantageous to the satellite signal capture and tracking.
作者
张瀚青
何在民
叶旅洋
马红皎
ZHANG Han-qing;HE Zai-min;YE Lv-yang;MA Hong-jiao(National Time Service Centre,Chinese Academy of Sciences,Xi’an Shanxi 710600,China;Key Laboratory of Precision Navigation and Timing Technology,Chinese Academy of Sciences,Xi'an Shanxi 710600,China;School of Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100039,China)
出处
《计算机仿真》
北大核心
2019年第8期71-76,共6页
Computer Simulation
基金
中国科学院西部青年学者A类项目(XAB2017A05)
国家自然科学基金项目(11703030)
关键词
北斗三号
勒让德序列
测距码
奇/偶相关
BeiDou Ⅲ
Legendre sequence
Ranging code
Odd/even correlation
