1. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
2. Navigation College, Dalian Maritime University, Dalian 116026, China
3. School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
4. Robotic Satellite Key Laboratory of Sichuan Province, Sichuan University, Chendu 610065, China