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针对机载相控阵雷达近程杂波抑制,提出了利用俯仰和差波束进行空域滤波的自适应算法。为消除近程杂波距离依赖性对杂波抑制性能的影响,该算法在不同的距离单元分别形成不同的俯仰和差波束;与目前的单元空域俯仰滤波算法相比,降低了自适应权的维数和计算复杂度。由于该算法仅利用雷达收发的第一个填零脉冲回波作为计算自适应滤波权系数的样本数据,避免了远程杂波对自适应权系数的影响。仿真实验证明,在无外界强干扰的情况下,新算法可以将近程杂波完全抑制。
Aiming at the short-range clutter suppression of airborne phased array radar, an adaptive algorithm for spatial filtering using pitch and difference beams is proposed. In order to eliminate the influence of short-range clutter distance dependence on clutter suppression performance, this algorithm forms different pitch and difference beams in different distance units respectively. Compared with the current unit pitch-domain pitch filter algorithm, the algorithm reduces the adaptive weight Dimension and computational complexity. Since the algorithm only uses the first zero-fill pulse echo sent and received by the radar as the sample data for calculating the adaptive filtering weight coefficient, the effect of the remote clutter on the adaptive weight coefficient is avoided. The simulation results show that the new algorithm can completely suppress the short-range clutter in the absence of strong external interference.