北斗系统L频段导航信号的波形设计及仿真

Waveform Design and Simulation for Beidou L Band Navigation Signal

随着全球导航卫星系统(Global Navigation Satellite System,GNSS)的不断增多以及频谱资源的限制,设计更高性能并减小相邻信号间干扰的未来GNSS信号体制成为紧迫任务。通过在信号的兼容性和导航性能约束条件之间的折中,提出北斗系统全球信号体制在L频段采用最小频移键控(Minimum Shift Keying,MSK)调制方式的信号波形设计方案。仿真结果表明,设计的优化信号与同频段相邻信号的频谱重叠程度小,谱安全性较高。同时,优化信号具有优于北斗系统公开服务信号B1C的导航性能,且信号最佳接收的接收机实现复杂度低于授权信号B1A。实际证明,上述成果可应用于北斗系统信号体制的顶层设计中,对进一步提高L频段的导航频谱利用率,以及我国自主的兼容信号体制设计具有参考意义。

With the increasing of GNSS and the limited spectrum resource, the future GNSS signal design in L band with higher performance and lower interference to pertinent signals becomes an urgent task. Through the compro- mise between the compatibility and navigation performance, the wavcform design based on MSK modulation was pro- posed for future BeiDou signal scheme in L band. The simulation results show that, the optimized signal has high spectrum security and better navigation performance compared with the BeiDou B1 C signal. Also, the realization complexity for signal receiving is, superior to the B1A signal. The research achievement can be used in the BeiDou top level signal design, which is of consultant significance for further improving the spectrum efficiency of L band and future compatible signal scheme design.