全球导航卫星系统接收机的复信号自适应陷波干扰抑制

为提高全球导航卫星系统接收机抑制带内窄带干扰的能力,提出一种采用复系数自适应陷波器的时域滤波干扰抑制方法。在数字基带通过自适应算法调整复数滤波器的频率参数,以实时检测和跟踪窄带干扰的中心频率。仿真结果表明,该方法可以快速、有效地抑制固定频率的窄带干扰和线性调频干扰,提高接收机在干扰条件下的捕获性能。其干扰抑制性能优于实系数自适应陷波器的干扰抑制方法。

Anti-jamming method using complex ANF for GNSS receivers

In order to improve the anti jamming performance of global navigation satellite system receivers, a method based on the complex ANF(adaptive notch filter) was proposed to suppress narrow band interference on digital base band. The ANF was constructed by a series of the first order IIR notch filters, and the frequency parameters of all filters were updated with adaptive algorithm to detect jamming and to suppress it in real time. Simulation results show that the present method is able to suppress the jamming effectively and quickly, and the capability of signal acquisition is enhanced under condition of jamming. Moreover, a better performance than a conditional real ANF is achieved in simulation.