Zihan Xu, Fei Zhao, Pingping Lu, National Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China, China; Yao Gao, Planetary Remote Sensing Laboratory, Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China, China; Tingyu Meng, Yanan Dang, National Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China, China; Mofei Li, China Agricultural University, Beijing, China, China