1. School of Information Science and Engineering, Hebei University of Science and Technology, The 54th Research Institute of China Electronics Technology Group Corporation,State Key Laboratory of Satellite Navigation System and Equipment Technology,Shijiazhuang,China
2. The 54th Research Institute of China Electronics Technology Group Corporation,State Key Laboratory of Satellite Navigation System and Equipment Technology,Shijiazhuang,China
3. School of Information Science and Engineering, Hebei University of Science and Technology,Shijiazhuang,China