1. Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou 730070, China
2. Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
3. Laboratory of Signal Detection and Processing, Xinjiang University, Urumqi 830017, China
4. China College of Computer Science and Technology, Xinjiang University, Urumqi 830017, China
5. Collage of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China