矩阵预滤波器在抗运动干扰中的应用研究

Application on matrix pre-filter against athletic interference

自适应波束形成器容易受到运动干扰和观测方向偏差的影响,针对该问题提出了一种基于矩阵预滤波的零陷展宽稳健波束形成算法。首先分析了矩阵预滤波器在抗运动干扰时的适应性,并利用矩阵预滤波器在运动干扰所在区域形成凹槽。利用椭圆投影定理计算预滤波后的导向矢量不确定集,在新的导向矢量不确定集下利用稳健Capon波束形成算法(RCB)寻找最优导向矢量。仿真分析表明,和RCB算法相比,该算法不仅获得更高的输出信干噪比,还获得了预先设定的展宽零陷。

Adaptive beamformers are easily affected by severe performance degradation in the presence of look direction mismatches and moving interferences. To solve this problem, a robust beamformer with widen nulls was proposed. The adaptability of the matrix filter in suppressing moving interferences was analyzed firstly, and then, some nulls were formed in the sector of moving interferences with the proposed matrix fiher. The steering vector uncertainty set via matrix filtering was calculated using the ellipsoidal calculus and used to construct constraints. Then the optimal steering vector was estimated using robust capon beamforming （RCB） algorithm. Simulation results show that, compared with RCB, the proposed algorithm offers not only higher signal-to- interference-plus-noise ratio （SINR） , but also specified widen nulls.