针对数字阵列雷达面临的短时脉冲干扰,提出了一种采用相控阵子阵结构的空域快速干扰抑制方法,避免了空时自适应算法响应时间慢的问题,可以以采样数据快拍为单位,进行干扰角度估计和天线方向图抗干扰零陷生成。 算法首先使用子阵输出的单快拍数据进行二维快速傅里叶变换估计得到存在模糊的干扰角度;然后,使用与干扰角度估计临近的三个角度构建展宽的干扰子空间来提高干扰抑制的鲁棒性;最后,通过基于施密特正交化的快速正交投影算法得到零陷权重矢量。 文中所提出的算法具有快拍级干扰检测和实时方向图零陷生成的显著优点,特别适合极短脉冲宽度的强干扰信号的抑制。

A space-domain rapid jamming suppression technique for sub-array digital array radar is proposed to deal with the short time pulse jammings, which greatly reduces the response time compared with the existing space-time adaptive algorithms. The algorithm can perform jamming direction of arrival (DOA) estimation and antenna pattern jamming nulling based on single sampling snapshot. Firstly, the single sampling snapshot data of sub-array output is processed by the two-dimensional fast Fourier transform to estimate the ambiguous jamming DOA. Then, three steering vectors close to the estimated jamming direction are employed to construct a widened jamming subspace to improve the robustness of jamming suppression. Finally, the nulling weight vector is calculated by the fast orthogonal projection algorithm based on Schmidt orthogonalization. The proposed algorithm has the remarkable advantages of snapshot-level response and fast nulling pattern optimization. It is especially suitable for strong jamming suppression with extremely short pulse widths.

TN972