用于人机交互的交流式电磁跟踪系统的研究

虚拟现实系统和计算机仿真系统中广泛采用电磁跟踪系统测量用户的头部或手部的位置和姿态来实现人机交互。本文分析了目前已有的直流式电磁跟踪系统的不足，提出了一种采用交流信号作激励源的交流式电磁跟踪系统，研究了该系统的结构，推导了用于提取传感器接收信号的递推数字互相关算法，讨论了算法参数与算法性能的关系。仿真实验证明了算法的有效性及理论分析的正确性。本文的研究成果为实际的交流式电磁跟踪系统的设计提供了理论依据。

Study on AC Electromagnetic Tracker for Human-Computer Interaction

Electromagnetic tracking systems are widely used in Virtual Reality and computer simulation system to measure the attitude and position of the users hand or head to perform Human-Computer Interaction. The shortcomings of the present direct current electromagnetic tracker are analyzed and an alternative current electromagnetic tracking system with the alternative current source is proposed. The structure of the proposed system is studied and the iterative digital correlation algorithm used for calculating the received data is deducted. The relationship between the parameter and the performance of the algorithm is discussed. The simulation result proves the effectiveness of the proposed algorithm. Actual alternative current electromagnetic tracking system can be designed on the basis of the theoretical analysis of this paper.