College of Intelligence Science and Technology National University of Defence and Technology Changsha 410073 China;
College of Intelligence Science and Technology National University of Defence and Technology Changsha 410073 China;
College of Intelligence Science and Technology National University of Defence and Technology Changsha 410073 China;
College of Intelligence Science and Technology National University of Defence and Technology Changsha 410073 China;
College of Intelligence Science and Technology National University of Defence and Technology Changsha 410073 China;
ultrasonic motor; stepping characteristics; pulse number control; synchronous acquisition system; precise positioning;