1. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, China
2. GNSS Research Center, Wuhan University, Wuhan, China
3. Electronic Information School, Wuhan University, Wuhan, China
4. Guangxi Water and Power Design Institute Company Ltd., Nanning, China
5. Hubei Luojia Laboratory, BDS Chip Research Center and the School of Microelectronics, Wuhan University, Wuhan, China