1. Navigation College, Jimei University, Xiamen, China
2. Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
3. International Research Center of Big Data for Sustainable Development Goals, Beijing, China
4. University of Chinese Academy of Sciences, Beijing, China
5. Beijing Institute of Radio Measurement, Beijing, China
6. College of Mathematics and Physics, Chengdu University of Technology, Chengdu, China