1. College of Information and Electrical Engineering; China Agricultural University; Beijing 100083 China
2. Key Laboratory of Agricultural Information Acquisition Technology; Ministry of Agriculture; Beijing 100083 China
3. Beijing Engineering and Technology Research Centre for Internet of Things in Agriculture; Beijing 100083 China
4. College of Mechanical and Electrical Engineering; Agricultural University of Hebei; Baoding 071001 China
5. College of Mechanical and Electronic Engineering; Shandong Agricultural University; Taian 271018 China