The aim of the study was to observe two lunar impact craters of Copernican age, Ohm (18.4°N, 113.5°W) and Stevinus (32.5°S, 54.2°E) under microwave radar data of Miniature Radio Frequency (Mini-RF), an instrument onboard Lunar Reconnaissance Orbiter (LRO) of NASA, where Ohm is located on the far side of the Moon and Stevinus is situated on the near side of the Moon. We have analyzed the characters of impact ejecta melt of both the craters in radar data which are not evidently distinguished in the high resolution optical data of narrow angle camera (NAC) and wide angle camera (WAC) of LRO mission. Circular polarization ratio (CPR) and m-chi decomposition images were developed using ENVI and ArcGIS software which were used to understand surface roughness and backscattering properties of Ohm and Stevinus craters. Both the craters evidently have high CPR values indicating either exposure of fresh material or elevated surface roughness due to surface geometry. The m-chi decomposition of Ohm and Stevinus craters shows dominant yellowish hue suggesting a backscatter combination of double-bounce (db) scattering and volume scattering (vs) in contrast to the surrounding terrain which shows Bragg scattering (bs) according to the 7-fold classification colour-wheel. Using available optical and Mini-RF data geological maps of both the craters were generated including features such as boundary of ejecta blanket, ejecta boulders and mass wasting in the crater.

该研究的目的是在微型无线电频率（Mini-RF）的微波雷达数据下观测两个哥白尼时代的月球撞击坑，欧姆（18.4°N，113.5°W）和Stevinus（32.5°S，54.2°E）是美国宇航局（NASA）的月球侦察轨道飞行器（LRO）上的一种仪器，欧姆位于月球的另一侧，史蒂文努斯位于月球的另一侧。我们分析了雷达数据中两个弹坑的撞击弹射熔体的特征，这在LRO任务的窄角相机（NAC）和广角相机（WAC）的高分辨率光学数据中没有明显区别。使用ENVI和ArcGIS软件开发了圆极化率（CPR）和m-chi分解图像，用于了解欧姆和Stevinus陨石坑的表面粗糙度和反向散射特性。两个弹坑显然都具有较高的CPR值，表明由于表面几何形状，暴露了新鲜材料或表面粗糙度增加。Ohm和Stevinus陨石坑的m-chi分解显示出显着的淡黄色调，表明双反弹（db）散射和体积散射（vs）的反向散射组合，而周围的地形则根据7-位显示了布拉格散射（bs）折叠分类色轮。利用可用的光学数据和Mini-RF数据，生成了两个陨石坑的地质图，包括诸如射出毯边界，射出巨石和陨石坑质量浪费等特征。Ohm和Stevinus陨石坑的m-chi分解显示出显着的淡黄色调，表明双反弹（db）散射和体积散射（vs）的反向散射组合，而周围的地形则根据7-位显示了布拉格散射（bs）折叠分类色轮。利用可用的光学数据和Mini-RF数据，生成了两个陨石坑的地质图，包括诸如射出毯边界，射出巨石和陨石坑质量浪费等特征。Ohm和Stevinus陨石坑的m-chi分解显示出显着的淡黄色调，表明双反弹（db）散射和体积散射（vs）的反向散射组合，而周围的地形则根据7-位显示了布拉格散射（bs）折叠分类色轮。利用可用的光学数据和Mini-RF数据，生成了两个陨石坑的地质图，包括诸如射出毯边界，射出巨石和陨石坑质量浪费等特征。