FDA-MIMO雷达主瓣距离欺骗式干扰抑制方法

Main-beam range deceptive jamming suppression approach with FDA-MIMO radar

主瓣欺骗式干扰降低了对真实目标的估计精度与跟踪准确性,对传统雷达提出了挑战。针对此问题,基于频率分集阵(frequency diverse array,FDA)-多输入多输出(multiple-input and multiple-output,MIMO)雷达,提出了一种抑制主瓣距离欺骗式干扰的方法。假目标产生器通过对截获的雷达信号进行延迟转发,导致真、假目标的时延(距离)差异,由此可形成具有不同发射频率的假目标。据此,首先利用频率分集阵雷达的距离维自由度在联合发射-接收维对真、假目标进行区分,其次设计了距离-角度二维自适应匹配滤波器,所有假目标由于距离维的失配而被抑制。该方法有效地解决了主瓣距离欺骗式干扰抑制的问题,提升了雷达在复杂电磁环境的抗干扰性能。仿真实验验证了所提方法的有效性。

The main-beam deceptive jamming causes the reduction of estimation precision and tracking accuracy of a true target,which is a challenge to the traditional radar systems.In this paper,based on the frequency diverse array(FDA)-multiple-input and multiple-output(MIMO)radar,an approach to suppress the main-beam range deceptive jamming is proposed.False targets with different transmit frequencies can be generated by retransmitting the intercepted radar’s transmitted waveform after time delay in the false target generation,leading to the time delay or range difference.On the basis of this property,the true and false targets can be firstly distinguished in the joint transmit-receive spatial frequency domain utilizing the range-dependent degrees-of-freedom in the FDA radar.Subsequently,due to the range mismatch,all false targets are suppressed by designing a range-angle two dimensional adaptive matched filter.With the proposed method,the main-beam range deceptive jamming can be effectively suppressed.Hence,the anti-interference performance of the radar in the complicated electromagnetic environment is improved.Simulation examples are provided to demonstrate the effectiveness of the proposed approach.