1. School of Electronics and Control Engineering, Chang’an Univ., P.O. Box 710064, Xi’an, China.
2. China Merchants Chongqing Communications Technology Research and Design Institute Co., Ltd., P.O. Box 400060, Chongqing, China.
3. Airport Management Office of Henan Toll Expressway Management Center, P.O. Box 450000, Henan China.