系统工程与电子技术 ›› 2018, Vol. 40 ›› Issue (5): 997-1003.doi: 10.3969/j.issn.1001-506X.2018.05.06

• 传感器与信号处理 • 上一篇    下一篇

FDA-MIMO雷达主瓣距离欺骗式干扰抑制方法

兰岚1, 廖桂生1, 许京伟1, 张玉洪2#br#

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  1. 1. 西安电子科技大学雷达信号处理国家重点实验室, 陕西 西安 710071; 2. 西安电子科技大学电子工程学院, 陕西 西安 710071
  • 出版日期:2018-04-28 发布日期:2018-04-24

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

LAN Lan1, LIAO Guisheng1, XU Jingwei2, ZHANG Yuhong2   

  1. 1. National Lab of Radar Signal Processing, Xidian University, Xi’an 710071, China; 2. School of Electronic Engineering, Xidian University, Xi’an 710071, China
  • Online:2018-04-28 Published:2018-04-24

摘要:

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。

Abstract:

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.