In this letter, the problem of monopulse angle estimation error under mainlobe interference for dual- polarization array is investigated. The adaptive monopulse angle estimation considering cross polarization with array beam scanning is analyzed. To reduce the angle estimation error, an adaptive polarization-constrained monopulse approach based on combined constrained cross polarization and main polarization is proposed. The cross polarization of antenna and target signal is not regarded as a source of estimation error which needs to be suppressed in previous literature. Instead, it contributes to the angle estimation here. The proposed method could obtain accurate monopulse angle estimation while suppressing mainlobe interference. Simulation results verify the performance of the proposed method.

中文翻译：

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双极化阵列的自适应极化约束单脉冲方法

本文研究了双极化阵列在主瓣干扰下的单脉冲角估计误差问题。分析了考虑交叉极化与阵列光束扫描的自适应单脉冲角度估计。为了减小角度估计误差，提出了一种基于约束交叉极化和主极化相结合的自适应极化约束单脉冲方法。天线和目标信号的交叉极化不被认为是估计误差的来源，在先前的文献中需要对此加以抑制。相反，它有助于角度估计。所提出的方法可以在抑制主瓣干扰的同时获得准确的单脉冲角估计。仿真结果验证了该方法的性能。