Xiaoguang Niu Kaiyi Zou Da Shen Steve Drew 0001 Shaowu Wu Guangyi Guo Ruizhi Chen UltraMotion: High-Precision Ultrasonic Arm Tracking for Real-World Exercises. 1846-1862 2024 February 23 IEEE Trans. Mob. Comput. 2 https://doi.org/10.1109/TMC.2023.3241077 db/journals/tmc/tmc23.html#NiuZSDWGC24