1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, People’s Republic of China
2. Key Laboratory of Surveying and Mapping Technology on Island and Reef, Ministry of Natural Resources, Qingdao, People’s Republic of China
3. Institute of Acoustics, Chinese Academy of Sciences, Beijing, People’s Republic of China
4. Unit 91001, Beijing, People’s Republic of China