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创建了地球场景数据集,结合全极化微波辐射传输模型,仿真了地球场景亮温.基于自主推导的全极化天线温度方程,通过GRASP9软件生成天线方向图,模拟了辐射计的天线温度.进而利用多元线性回归方法,求取了天线交叉极化校正M矩阵,实现了对星载极化相关型全极化微波辐射计天线交叉极化的校正.试验结果表明:天线温度与地球场景亮温之间具有良好的线性关系;天线交叉极化对全极化微波辐射计正交通道亮温影响明显,尤其以对垂直极化亮温误差的影响最为显著;校正后各通道的天线交叉极化得到了有效的减小,交叉极化优于23dB,极化纯度大于99.5%,采用M矩阵校正及消除天线温度中交叉极化亮温影响的方案是切实可行的.该校正技术可以实现星载极化相关型全极化微波辐射计在轨运行后对于天线交叉极化的最终校正.
Based on the fully polarimetric microwave radiation transmission model, the brightness temperature of the earth scene was simulated.The antenna pattern was generated by GRASP9 software and the antenna temperature of the radiometer was simulated. And then use the multiple linear regression method to obtain the antenna cross-polarization correction M matrix, and realize the calibration of the cross-polarization of the spaceborne polarization-related all-polarization microwave radiometer antenna.Experimental results show that: the antenna temperature and the Earth’s scene bright Temperature has a good linear relationship between; antenna cross polarization of the full-polarized microwave radiometer orthogonal passage brightness significantly, in particular, the vertical polarization brightness temperature error is the most significant; after correction of each channel antenna cross-pole Is effectively reduced, the cross-polarization better than 23dB, the polarization purity is greater than 99.5%, the use of M matrix correction and eliminate cross-polarization antenna temperature effects of light temperature is feasible.This correction technology can achieve the star Final Correction of Antenna Cross Polarization After Aperture-Related Full-Polarized Microwave Radiometer is Orbital Operation.