多角度偏振成像仪用于获取全球大气气溶胶和云性质参数,能探测大气多角度偏振信息。偏振探测是仪器的重要特性,大视场光学仪器起偏效应显著,应予以定标校正。在轨运行前通过实验室、外场对偏振探测性能进行全面检测。在轨运行时,设计基于自然目标偏振特性的在轨检测方法,进行数据校正后,再对大范围海洋耀光和水云偏振虹进行分析,通过偏差分布图像可在复杂多云的数据环境中直观显示仪器状态,实现了全视场偏振探测性能的快速评测,验证了地面应用系统数据处理的有效性。在轨偏振探测性能与实验室、外场检测的性能一致,探测精度满足优于0.02的设计指标。检测数据为气溶胶和云反演应用提供重要依据,各阶段检测方法为广角偏振遥感仪器检测提供参考。

Directional polarimetric camera (DPC) is used to monitor several parameters related to the global atmospheric aerosol and clouds as it can detect atmospheric multi-angle polarization. However, it is an ultra-wide-angle optical instrument; therefore, the polarization effect of lens cannot be neglected, and it should be corrected during the calibration stage. A polarization measurement performance test is conducted prior to launching the instrument in the laboratory and outfield. To meet the requirement of an on-orbit measurement, an on-orbit detection method is designed to assess the polarization detection performance of the optical polarization remote sensing instrument with a large field of view. The rapid evaluation of polarization detection performance in full field of view is achieved by analyzing the polarization rainbow data of ocean flares and water clouds in a wide range of complex environments, and the data processing effectiveness of ground application system is verified. The on-orbit polarization detection performance of DPC is consistent with the laboratory and outfield data, which provides an important basis for aerosol and cloud inversion applications. Furthermore, the detection methods in each stage can be used as a reference in wide-angle polarization remote sensing applications.