1. School of Mechanical Engineering and Electronic Information and the Key Laboratory of Geological Survey and Evaluation of Ministry of Education, China University of Geosciences, Wuhan, China
2. Southwest Electronics and Telecommunication Technology Research Institute, Chengdu, China
3. School of Automation, China University of Geosciences, Wuhan, China
4. Shenzhen TianDing Microwave Technology Company Ltd, Shenzhen, China