波形分集阵雷达抗欺骗式干扰技术

本文从单基地雷达抗干扰的应用需求出发，分析了现有单基地雷达体制抗干扰的现状以及面临的困难.针对欺骗式干扰对抗的难题，提出了基于新体制波形分集阵雷达的抗主瓣方向欺骗式干扰思路，利用频率分集阵（Frequency Diverse Array，FDA）多输入多输出（Multiple-Input Multiple-Output，MIMO）雷达发射维自由度，实现真实目标和转发假目标在发射维度的区分，在部分先验知识的条件下，初步论证了FDA-MIMO雷达抗欺骗式干扰特别是主瓣欺骗式干扰的可行性.同时考虑转发式欺骗干扰在时间维的伪随机特性，提出了基于多假设检验的干扰样本挑选方法，大大提高了干扰协方差矩阵的估计性能.最后给出了FDA-MIMO雷达抗主瓣欺骗式干扰的分析与仿真结果.

On Anti-jamming Technique with Waveform Diverse Array Radar

This work is motivated by the increasing demand on anti-jamming techniques in radar systems.The current challenging issues on the anti-jamming task in conventional radar frameworks are outlined. Focused on deceptive jamming countermeasure issue,a novel framework,referred to as waveform diverse array (WDA) radar,is proposed to address the anti-jamming problem.Utilizing the additional degrees-of-freedom (DOFs) in transmit spatial frequency in frequency diverse array (FDA) multiple-input multiple-output (MIMO) radar,the true target and repeated false target can be isolated in the transmit spatial frequency domain.Moreover,this paper investigates the feasibility by using the suggested FDA-MIMO radar to suppress the deceptive jamming signals,even those from the mainlobe direction,with help of some information on true target obtained in earlier detection stage.In consideration of the random distribution of repeated false target in time domain,a jamming signal sample selection approach based on multi-hypothesis test is proposed,which evidently improves the estimation accuracy of jamming covariance matrix.Further analysis and simulation results are provided to confirm the effectiveness of the proposed waveform diverse array technique.