1. GNSS Research Center, Wuhan University, Wuhan 430079, China
2. Wuhan University Student Engineering Training and Innovation Practice Center, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China
3. Hubei Luojia Laboratory BDS Chip Research Center, No. 129 Luoyu Road, Wuhan 430079, China
4. School of Microelectronics, Wuhan University, Wuhan 430079, China