基于二次补偿的FDA-MIMO雷达抗主瓣欺骗式干扰方法

主瓣欺骗式干扰与真实目标具有相同角度, 传统相控阵雷达无法在空域对其进行区分, 严重降低了对真实目标的探测性能。针对此问题, 本文在频率分集阵列多输入多输出(frequency diversity array multiple input multiple output, FDA-MIMO)雷达中提出一种基于二次补偿的抗主瓣欺骗式干扰方法。首先, 通过对脉内主值距离进行前移补偿和对距离频率进行后移补偿, 等效于将欺骗式干扰从方向图主瓣搬移到旁瓣。然后, 借助奇异谱分析技术进行样本筛选以获得干扰协方差矩阵。最后，利用自适应波束形成的方法对干扰进行抑制。仿真实验验证了所提抗干扰方法的有效性。

Mainlobe deceptive jammer suppression with FDA-MIMO radarbased on secondary compensation

The main-lobe deceptive jammers, which have the same angle as the true target, cannot be distinguished in the spatial domain with the traditional phased array radar system, reducing the performance of target detection seriously. To solve this problem, the method to suppress the mainlobe deceptive jammers based on secondary compensation is proposed with the frequency diversity array multiple input multiple output (FDA-MIMO) radar. Firstly, the forward compensation is performed to the principle range, and the backward compensation is implemented to the range frequency. Hence, the main-lobe deceptive jammers are equivalently moved to the sidelobes of the beampattern. Then, the jammer covariance matrix is obtained by selecting the samples resorting to the singular spectrum analysis technique. Finally, the jammers can be suppressed with adaptive beamforming. The effectiveness of the proposed jammer suppression method is verified by simulation results.