1. College of Big Data and Information Engineering, Guizhou University, Guiyang, China
2. College of Electronic and Information Engineering, Southwest University, Chongqing, China
3. State Key Laboratory of Efficient Utilization for Low Grade Phosphate Rock and Its Associated Resources, Wengfu Group, Guiyang, China
4. College of Electronics and Information Engineering, Sichuan University, Chengdu, China