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中文摘要：
极化校准是极化散射矩阵正确获取的重要步骤之一,大口径雷达的极化校准一直是一个难点。为此,提出一种新的无源极化校准方案,该方案利用已校准的小口径雷达来校准大口径雷达。首先,通过外场实验用单个二面角校准小口径雷达;然后,小口径雷达发射信号照射卫星,大小口径两部雷达同时接收并进行信号处理,给出相应的校准算法,最后,通过专业电磁计算软件获得定标体以及卫星散射矩阵的理论值,仿真实验结果验证了提出的极化校准方案的有效性。
英文摘要：
The polarimetric calibration is an important step to acquire the accurate polarization scattering matrix and is extensively difficult for the large aperture polarimetric radar.So a novel passive polarimetric calibration scheme is presented,which calibrates large aperture polarimetric radar using calibrated small aperture polarimetric radar.At first,the small aperture radar is calibrated in the field experiment using a single dihedral.Then the small aperture radar emits signal to illuminate the satellite,and the echo is received by both radars at the same time.The calibration algorithm is proposed as well.At last,theoretical polarization scattering matrixes of the calibration target and the satellite are required by the professional computation software,and simulation results prove the feasibility of the proposed scheme and the polarimetric calibration algorithm.
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