1. Anhui University, School of Electrical Engineering and Automation, Hefei 230601, China
2. Anhui University, School of Electrical Engineering and Automation, Hefei 230601, ChinabAnhui University, Ministry of Education, Key Laboratory of Intelligent Computing and Signal Processing, Hefei 230039, China
3. University of Science and Technology of China, Department of Precision Machinery and Precision Instrumentation, Hefei 230026, China