Compass B1信号设计中的非对称ALTBOC复用技术

中国第二代卫星导航系统(Compass)将分为区域和全球系统2个阶段完成,使得研发多路导航信号复用技术实现Compass的平稳过渡问题成为一项紧迫任务。该文提出了一种非对称ALTBOC复用技术,通过复子载波将调制在2个不同中心频点,具有不同调制方式和码速率的4路二进制信号分量恒包络复用在同一载波上。仿真结果表明:该方法复用损耗小于1dB,在非匹配接收模式下,采用4MHz带宽和10MHz带宽接收的相关信噪比损耗分别约为1.5dB和1.1dB,具有较高的复用效率和较好的信号接收性能,是实现Compass B1区域信号和全球信号平稳过渡的有效解决方案。

Non-symmetrical ALTBOC multiplexing for Compass B1 signal design

The Chinese second generation satellite navigation system(Compass) will be developed in two phases,so independent multiplexing solutions are needed to realize a smooth transition.The center frequency difference between the Compass B1 regional and global signals is handled by the non-symmetrical ALTBOC multiplexing technique,which can combine four binary signal components with different modulation methods in each lower or upper band,as well as with different chip rates.Simulations show that the processing loss is less than 1 dB and the correlation loss is 1.5 dB at 4 MHz and 1.1 dB at 10 MHz receiving bandwidth.Thus,this is an effective solution for combining the Compass B1 regional and global signals in the same frequency band.