1. National Time Service Center Chinese Academy of Sciences Xi'an China
2. Department of Land Surveying and Geo‐informatics Hong Kong Polytechnic University Hong Kong
3. Department of Surveying and Mapping China University of Petroleum (East China) Qingdao China
4. Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology Qingdao China
5. Shenzhen Research Institute Hong Kong Polytechnic University Shenzhen China