虚拟现实系统中多自由度电磁跟踪方法仿真

Simulation of Multiple Degrees of Freedom Electromagnetic Tracking in Virtual Reality System

针对传统虚拟现实系统中多自由度电磁跟踪方法存在跟踪性能较差、误差较高等问题,提出一种基于迭代算法的多自由度电磁跟踪方法。将发射端及探测器作为传感器定位软件,利用发射端发出的信号促使三轴完成分时段发射,使脉冲信号能够接收由探测器传回的电磁信号和环境磁场信号。运用磁场信号引入磁场源的运动信息,采用机械的方式控制磁棒的旋转,使磁棒与传感器处于理想的状态。根据两者之间的状态,采用迭代算法对传感器的旋转角进行定位,实现电磁跟踪。仿真结果证明,所提方法有效减少了跟踪过程中产生的位置误差,并且跟踪性能都有所提高,达到了较为理想的跟踪效果。

Aiming at the problems of poor tracking performance and high error in multi-freedom electromagnetic tracking methods in traditional virtual reality systems,a multi-freedom electromagnetic tracking method in virtual reality systems based on iterative algorithm is proposed.The transmitter and the detector were used as sensor positioning software to drive the three axes to complete time-sharing by the pulse signal sent by the transmitter,and the pulse signal receiver received the electromagnetic signal detected by the detector and the ambient magnetic field signal in the unit-empty driving time domain.The magnetic field signal was used to introduce the motion information of the magnetic field source,and the rotation of the magnetic rod was controlled mechanically so that the magnetic rod and the sensor are in an ideal state.According to the state between the two,an iterative algorithm was used to locate the rotation angle of the sensor to achieve electromagnetic tracking.Simulation experiments show that the proposed method can effectively reduce the position error generated during the tracking process,and the tracking performance was improved,which achieves an ideal tracking effect.