1. Department of Automation Science and Electrical Engineering, Beihang University, Beijing, China
2. School of Engineering Medicine, Beihang University, Beijing, China
3. Beijing Aerospace Measurement and Control Technology Co., Ltd., Beijing, China
4. College of Computer Science, Chongqing University, Chongqing, China
5. Gansu Provincial Key Laboratory of Wearable Computing, School of Information Science and Engineering, Lanzhou University, Lanzhou, China
6. School of Automation Science and Electrical Engineering, Beihang University, Beijing, China