With tracing region enlarged

an augmented reality system

which uses magnetic force tracker to realize tracing

need more magnetic force trackers. But their transmitters are very close to each other

it leads to mutual interference and virtual object in helmet vibrating obviously. According to the moving characteristics of head and hand while interacting

different methods are designed and applied to control the mutual interference. To the interference of tracing hand

particle filter is adopted. To the interference of tracing head

Kalman filter is used only when it holds still. While moving slowly

the improved intrinsic 3D discreet Curve smoothing algorithm is used. Compared with old algorithm

this improved algorithm can deal with dynamic data using an approaching-real-time model and remove of interference to Euler Angle using bilateral filtering. While head moves quickly

filter is stopped. Furthermore

the critical damping is applied to avoid jumping while entering the quick state. The results show that the mutual interference is reduced significantly by using these methods.