基于自适应滤波器的高精度可见光定位方法

High precision visible light positioning method based on adaptive filter

在室内可见光定位系统中,热噪声、散粒噪声的存在会大幅降低定位精度。为了提高定位精度,提出一种基于接收信号强度的可见光定位方法。首先采用自适应滤波方法大幅度滤除接收信号中的噪声,然后采用互相关检测法进一步滤除噪声,提取出原信号强度,最后通过最小二乘法估算出待测物体坐标。仿真结果表明:在4 m×4 m×3 m房间内,所设的1681个检测点的定位误差均在0.01 m以内,并且在不同信噪比的情况下,定位误差基本一致,即可见光定位方法对噪声有一定抑制能力。

The existence of thermal noise and shot noise will greatly reduce the positioning accuracy of indoor visible light positioning system.In order to improve the positioning accuracy,a visible light location method based on received signal strength is proposed.Firstly,the adaptive filtering method is used to greatly filter the noise in the received signal,and then the cross-correlation detection method is used to further filter the noise,and the original signal strength is extracted.Finally,the coordinates of the object to be measured are estimated by the least square method.The simulation results show that in a 4 m×4 m×3 m room,the positioning errors of 1681 detection points are within 0.01 m,and the positioning errors are basically the same under different signal-to-noise ratios,therefore,the visible light location method has a certain ability to suppress noise.