基于大气辐射传输模型的地物偏振反射率反演方法

Polarization reflectance retrieval method based on atmospheric radiative transfer model

提出一种基于大气矢量辐射传输模型的地物偏振反射率反演方法.利用辐射传输模型,建立地表反射率、观测条件与传感器入瞳处辐亮度偏振态的查找表,再进行查找表反查及数值计算,完成偏振反射率反演.验证实验表明,典型地面目标物的偏振反射率反演精度可达到90%.

Current polarization detection is mainly based on the polarization state of at-sensor radiance,w hich can enhance objects of interest or restrain background disturbance qualitatively. There is only empirical linear method for polarized reflectance retrieval of ground objects,w hich is inadequate in terms of adaptability and real-time capability under varied observation conditions. A polarized reflectance retrieval method based on polarized atmospheric radiative transfer model is hereby proposed. A lookup table（ LUT） is established by using the radiative transfer model to illustrate the relationship among polarized reflectance,observation condition and at-sensor polarization state. Polarized reflectance can then be retrieved using the LUT combined w ith numerical calculation. Results show that the retrieval accuracy of polarized reflectance of typical ground objects can be up to 90%.