主瓣伴随干扰下数字子阵雷达和差波束测角方法

Digital Sub-Array Radar Sum-Difference DOA Estimation Method in the Presence of Mainlobe Following Jamming

针对数字子阵体制雷达在强主瓣干扰存在情况下弱目标的到达方向DOA估计问题,提出了一种和差波束测角方法。首先,建立了多子阵和差波束结构下的主瓣干扰与目标回波的接收模型。然后,根据目标回波与干扰信号在时域上的不相关特性,对每个子阵列采用盲源分离算法分离目标回波与干扰信号,进而联合各子阵分离的目标回波/干扰信号,采用单脉冲测角技术实现目标/干扰DOA估计。最后,通过数值仿真实验验证了分析算法的有效性及性能。

Aiming at the estimation problem of the Direction of Arrival(DOA)of weak targets in the presence of strong mainlobe interference for digital sub-array radar,this paper proposes a sum-difference beam angle measurement method.Firstly,a receiving model of the mainlobe interference and target echo under the multi-subarray sum-difference beam structure is established.Then,according to the uncorrelated characteristics of the target echo and the interference signal in the time domain,blind source separation is used for each sub-array to separates the target echo and interference signal,and monopulse angle measurement technology is used to achieve target/interference DOA estimation via combining the target echo/interference signal separated by each sub-array.Finally,the effectiveness and analysis performance of this method is verified by numerical simulation experiment.