1. Department of Electrical Engineering
2. Harbin Institute of Technology
3. Harbin
4. China
5. College of Electronic Information and Automation
6. Measurement Technology and Instrumentation Key Laboratory of Hebei Province
7. School of Electrical. Engineer
8. Yanshan University
9. Qinhuangdao 066004
10. Civil Aviation University of China
11. Tianjin 300300