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雷达目标的极化散射矩阵包含了目标的结构、材料和形状等特征信息,在目标识别、分类以及抗干扰等领域可发挥重要作用。准确获取目标的极化回波信息是进一步利用极化特征进行目标识别分类的前提。本文依据瞬时极化测量体制,针对实际的双通道瞬时极化雷达系统,推导了包含通道不平衡和天线串扰等系统误差的数学模型。通过仿真分析,获得了通道不平衡和天线串扰对提取目标极化散射矩阵的影响,为瞬时极化雷达系统设计和系统校准工作提供依据。
The polarization scattering matrix of the radar target contains the feature information of the target’s structure, material and shape, and can play an important role in the fields of target recognition, classification and anti-interference. Accurately obtaining the target’s polarization echo information is a prerequisite for further utilizing the polarization feature for target recognition classification. According to the system of instantaneous polarization measurement, a mathematical model of system error including channel unbalance and antenna crosstalk is deduced for the actual two-channel instantaneous polarization radar system. Through the simulation analysis, the influence of channel imbalance and antenna crosstalk on the target polarization scattering matrix is obtained, which provides the basis for the design and system calibration of the instantaneous polarization radar system.