卫星导航接收机捕获和跟踪抗干扰能力分析

Performance Comparison of Antijamming Ability between Capturing and Tracking in Navigation Receiver

卫星导航抗干扰技术是接收机研制中的热点问题,不同的干扰模式对接收机的影响各不相同。通过建立非相干高斯白噪声、单频干扰和扫频干扰等3种常见干扰模型,分析了干扰对码分多址卫星导航接收机常用的并行码相位捕获和科斯塔斯环路跟踪阶段的影响,获得了其在2个阶段的抗干扰能力。研究表明,不同频率变换方式的单频干扰对接收机环路的影响区别不大,而与干扰频点接近信号中心频点的长短密切相关,同时接收机对非相关高斯白噪声干扰的抗击能力要远大于单频干扰。研究结论对码分多址卫星导航接收机和干扰机的设计具有一定的参考意义。

Antijamming technology of navigation receiver is one hot issue discussed in the current navigation field. Through the establishment model of three interference patterns,including white Gaussian non-coherent noise,single frequency interference and chirp interference,their respective stages of parallel code phase search and Costas loop tracking phase are compared. Simulation results show that influence of single frequency interference of different frequency transformation methods on the receiver loop is not obvious. However,it has something to do with the length of signal interference frequency point and signal center frequency point. Meanwhile,antijamming ability of white Gaussian non-coherent noise is much stronger than single frequency interference. This conclusion has certain reference significance for the design of CDMA receiver and antijamming receiver.