窄带干扰下北斗卫星导航信号性能分析

在介绍近期公布的北斗卫星导航系统空间信号接口控制文件(interface control document)中B1频点QPSK(quadrature phase shift keying, 正交相移键控)调制信号及测距码构成的基础上, 针对窄带干扰对卫星导航信号性能影响问题, 通过建立卫星导航直接序列扩频通信系统模型, 对窄带干扰下的北斗卫星导航系统解扩处理增益、相关解扩处理变化规律、误码性能以及对导航信号等效载噪比的影响进行了分析和数字仿真。仿真结果表明, 窄带干扰下, 导航信号性能降低程度与干扰实施位置、扩频码特性、调制样式等有关, 导航信号的性能改善需综合考虑干扰特性、扩频特性及调制样式等方面的影响。

Study on evaluating impact of narrowband interference on Beidou navigation system's signals

On the basic of describes the space signal interface control document of the Beidou satellite navigation system about the quadrature phase shift keying (QPSK) modulated signals and ranging codes published recently, for the direct sequence spread spectrum(DSSS) communication system used by the navigation system, analysis the performance of system in the presence of narrowband interference, and simulate the result. The result shows that, in the presence of narrowband interference, related the performance of the navigation signals with jamming position, characteristics of the spreading code and modulation styles, and for improving the performance of the navigation signal, it's necessary to consider factors above mentioned.