1. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China
2. Guangxi Key Laboratory of ITS (Guilin University of Electronic Technology), Guilin 541000, China
3. Nanning Research Institute, Guilin University of Electronic Technology, Nanning 530000, China
4. Guangxi Key Laboratory of Precision Navigation Technology and Application (Guilin University of Electronic Technology), Guilin 541000, China