大视场偏振 CCD相机内部的多个光学表面会改变入射光的偏振状态, 并且改变的程度与入射光的偏振态、视场角和方位角等有关, 影响了仪器偏振测量精度, 从而制约了偏振成像遥感数据的定量化应用水平。为解决这一问题, 从考虑偏振效应的大视场偏振相机响应输出模型出发, 研究模型参数的标定方法, 通过设计试验获取了模型参数标定数据。将经过标定的大视场偏振 CCD相机测试值和可调偏振度光源预设偏振度值进行对比, 结果显示偏振相机在 0°、15°、25°视场角下的偏振度测量平均误差不大于 1.18%, 远小于光学镜头自身的起偏度。消除偏振遥感仪器自身的偏振敏感性影响, 为将来我国自主星载偏振遥感图像的定量化应用奠定基础。

Abstract: The polarization state of the object is altered due to the surfaces of the optical lens in the polarization CCD camera with large viewing field, and the variation relate to the field of view, azimuth angle and polarization states of the observed beams. The polarimetric accuracies limit the application of polarization remote sensing due to the polarization phenomenon of the instrument. To overcome the problems, calibration method of the model parameters and retrieval of the polarization information is introduced based on the polarimetric calibration model. In order to verify the calibration method feasibility, the Degree of Linear Polarization (DOLP) comparison tests of the calibrated polarization CCD camera with large viewing field compared with the high-precision variable polarization light source have been carried out. Experimental results show that the DOLP accuracy of the calibrated polarization CCD camera is better than 1.18% at the 0°, 15° and 25° field of view. The method of polarimetric calibration would get rid of the influence of polarization phenomena of the polarization CCD camera, and contribute to fundamental basis for the quantitative application of polarization remote sensing information for the Chinese polarized satellite sensor.