基于FDA雷达的多径干扰抑制及目标检测

Multipath Jamming Suppression and Target Detection Based on FDA Radar

针对机载雷达低空目标检测应用背景,本文建立低空入射角下FDA(Frequency diverse array)雷达目标探测中的修正型多径检测模型,提出基于FDA雷达的多径干扰抑制方法,并利用无训练数据广义似然比检测(Generalized Likelihood Ratio Test,GLRT)方法实现多径传播环境下的运动目标检测。仿真结果表明,FDA雷达频偏引起的距离-角度依赖性能够有效抑制低入射角下的多径反射回波,因而能够明显提升对低空目标的检测性能。

Aiming at the application background of airborne radar low-altitude target detection,this paper establishes a modified multipath detection model for FDA(Frequency diverse array)radar target detection at low-altitude incident angles.Besides,a multipath interference suppression method based on FDA radar is proposed.And the generalized likelihood ratio test(GLRT)method with no training data realizes the detection of moving targets in a multipath propagation environment.The simulation results show that the range-angle dependence caused by the FDA radar frequency offset can effectively suppress the multipath reflected echoes at low incident angles,and thus can significantly improve the detection performance of low-altitude targets.