1. School of Automation, China University of Geosciences, Wuhan, People's Republic of China
2. Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems, Wuhan, People's Republic of China
3. Engineering Research Center of Intelligent Technology for Geo-Exploration, Ministry of Education, Wuhan, People's Republic of China
4. Department of Electrical Engineering Electronics, University of Liverpool, Liverpool, UK