1. National Time Service Center (NTSC), Chinese Academy of Sciences,Key Laboratory of Precision Navigation and Timing Technology,Xi'an,China
2. School of Communications and Information Engineering, School of Artificial Intelligence, Xi'an University of Posts and Telecommunications,Xi'an,China
3. National Time Service Center, Chinese Academy of Sciences,Xi'an,China
4. Xi'an University of Posts and Telecommunications,Xi'an,China