【摘要】 基于到达信号强度(RSS)测距的方法,可见光室内定位系统中因为墙面反射和外界噪声等存在干扰,从而产生误差.将计算机图形学中的Phong模型应用到可见光定位的墙面反射模型中,通过计算仿真反射和噪声信号到达接收端的强度,与发射端直射到接收端的信号强度进行对比,发现干扰信号中反射信号的强度与直射强度处于同一个数量级上,因此干扰对于可见光定位系统误差的影响不容忽略.仿真得到这些干扰对于最终定位系统造成的误差,并且与表示定位性能的克拉美罗下界进行对比,发现最大误差达到1.82 m,平均误差为0.12 m,干扰现象在墙角区域明显.更多还原

【Abstract】 The visible light indoor positioning system based on received signal strength(RSS)has positioning error due to the disturbance of the wall reflection and the external noise.This system applies Phong in computer graphics to the wall reflection of visible light positioning.Comparing signal strength from LEDs directly with the reflection and noise simulation at the receiving,it is found that signal strength of the wall reflection and direct strength are in the same order of magnitude.Thus the disturbance of the wall reflection and the external noise cannot be ignored.This article compares the simulation error caused by the disturbance to the positioning system with Cramer-Rao bound which represents the lower limit of the positioning error.It is found that maximum error is 1.8 m and the average error is 0.12 m.The disturbance phenomenon is obvious in the corner of the wall.更多还原