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

  • 摘要: 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。

     

    Abstract: 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.

     

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