The high circular polarization ratio (CPR) was found in the permanently shaded region (PSR) of the Moon poles by Mini -SAR and Mini-RF remote sensing. That is considered as a sign of the presence of water ice. However, high CPR depend on the scattering of rough surface for the lunar surface and the scattering of dihedral angle between distributed rocks are investigated in many studies. In this paper, the surface of the moon and rock in the regolith is regarded as rough surfaces of different roughness. The integral equation method (IEM) and vector radiative transfer (VRT) method are used to analyze the double-bounce scattering between the moon surface and rock surface in the regolith. In order to calculate a larger range of surface roughness scattering models, the Fresnel reflection coefficient of a transition function is presented to modify the IEM. It can be used to obtain the effect of different roughness on CPR.

来源平台：2022 INTERNATIONAL CONFERENCE ON MICROWAVE AND MILLIMETER WAVE TECHNOLOGY (ICMMT)