大视场偏振成像仪的相对辐射校正研究

Relative Radiometric Correction of Polarization Imager with Large Field of View

设计了基于单像元辐射响应模型的相对辐射校正方法和流程。依据信号还原入射光的反演顺序,分析非均匀性干扰信息,依次对探测器、空间杂散光、起偏度和光学系统相对透过率进行校正。在轨测试期间,设计了基于沙漠场反射率法的多角度观测数据快速检验方法,满足了大视场偏振成像仪的相对辐射性能检测需求。实验数据表明,单点相对辐射响应差异均小于4%,相对辐射校正方法合理有效。相对辐射校正和在轨快速检验的方法为相关大视场偏振成像仪的研制和在轨辐射定标提供了参考。

The relative radiation correction method for large field of view polarization imaging instrument was discussed.According to the inversion order of the physical quantity of the incident light restored by the detection signal,the relative radiation correction method of the large field polarization imaging instrument based on single pixel radiation response model is proposed.The detector correction,spatial stray light correction,polarization correction and optical system relative transmittance correction are carried out in turn.During the on orbit test,a fast validation method of multi angle observation data based on desert field reflectance method is designed to meet the detection requirements of large field of view polarization imager.The experimental data show that the difference of single point radiation response is less than 4%,and the relative radiometric correction method is reasonable and effective,which provides data basis for on orbit radiometric correction using large amount of statistical method.The method of relative radiometric correction and on orbit fast test provide effective reference for the follwing polarization imaging instruments with large field of view.