1. School of Science, Shenyang Aerospace University, Shenyang 110136, P. R. China
2. Zhejiang Key Laboratory of General, Aviation Operation, Technology, Jiande, P. R. China
3. CAAC Key Laboratory of General Aviation Operation, Department of General Aviation, Civil Aviation Management Institute of China, Beijing, P. R. China
4. School of Electronic and Information Engineering, Shenyang Aerospace University, Shenyang 110136, P. R. China