应用全极化辅助天线和Kalman滤波器的旁瓣干扰对抗方法

Sidelobe Interference Cancellation Based on Dual Polarization Auxiliary Antenna and Kalman Filter

为减小干扰极化方式对旁瓣对消系统的影响,提出一种基于全极化辅助天线和Kalman滤波器的极化域-空域联合抗旁瓣干扰方法。首先对辅助天线进行正交双极化改造,根据极化通道功率优选辅助通道信号,进而利用Kalman滤波器进行闭环旁瓣对消。该方法将旁瓣对消系统看作误差预测滤波器,将优选的辅助通道加权和作为量测,通过迭代修正权值矢量,减小主通道信号与量测的误差,从而消除旁瓣干扰,提高主通道信噪比。仿真实验表明:该方法收敛速度快,适用于多辅助通道情况,对正交极化干扰的输出信噪比优于常规旁瓣对消约10dB,在低快拍条件下稳定性好。

In order to reduce the effects of interference polarizations on sidelobe cancellation system, this paper proposes an anti-jamming method in space-polarization domain based on dual polarization auxiliary antenna and Kalman filter. The paper transforms the auxiliary antennas into dual polarization and selects the polarized signal by auxiliary channel power, and then uses the Kalman filter and the selected signal channel to cancel the side-lobe jamming in main antenna channel . In this method, the side-lobe canceller system is regarded as error prediction filter; the optimized auxiliary channel output is weighted and added as the measurement; the weight vector is modified iteratively to reduce the error of the measurement and main channel signal, eliminating the side-lobe interference and improve the signal-to-noise ratio of main antenna channel. The simulation results show that the convergence speed and stability of this method are better than that of the conventional side-lobe cancellation algorithm, and the method applies to multichannel. The output SNR of orthogonal polarization interference is better than that of the conventional SLC of about 10 dB, and the stability is fine with low sampling points.