1. Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science and Technology, Nanjing Jiangsu 210044, China; 2. College of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing Jiangsu 210044, China; 3. Jiangsu Technology and Engineering Center of Meteorology Sensor Network, Nanjing University of Information Science and Technology, Nanjing Jiangsu 210044, China