基于动态增益的可见光定位系统研究  

The research on visible light positioning system based on an amplifier with dynamic gain

作　　者：程贵东 蔡喜平[1] 刘健 卢钰松 胡延静 Cheng Guidong;Cai Xiping;Liu Jian;Lu Yusong;Hu Yanjing(School of Physical Science and Technology,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学物理科学与技术学院,哈尔滨150080

出　　处：《电子测量技术》2023年第10期6-15,共10页Electronic Measurement Technology

基　　金：黑龙江大学研究生创新科研项目(YJSCX2022-257HLJU)资助。

摘　　要：采用固定增益的RSS可见光定位技术可探测的信号光强变化范围小,在弱信号区域定位精度很低、有效定位空间小。提出了基于动态增益的RSS可见光定位系统,通过将接收电路输出信号反馈至控制电路,自动调节主放大器的增益,扩大可探测的信号光强变化范围,提高在弱信号区域的定位精度,从而扩大有效定位空间。实验结果表明,在空间大小为1 m×1 m×1.89 m的实验环境内,可以实现在1.0 m×1.0 m×0.6 m的空间内高精度定位,相比于固定增益的定位系统有效定位空间扩大了约86.72%。在弱信号区域二维定位对比实验中,较固定增益的定位系统平均定位误差降低了47.05%。系统平均误差均小于5 cm。表明基于动态增益的RSS可见光定位系统在满足室内定位精度要求的同时,可以增大定位空间范围、提高弱信号区域定位精度。To a RSS visible light positioning system based on an amplifier with fixed gain,the detectable range of the light intensity is small,which leads to very low positioning accuracy in the area with weak signal and then results in a decreased space of effective positioning.A RSS visible light positioning system based on an amplifier with dynamically adjustable gain is proposed,where the gain of the main amplifier is adjusted automatically in light of the feedback from the output of the signal processor,thus the detectable range of the light intensity is extended,the positioning accuracy in the weak signal area is improved and the effective positioning space is expanded.Experiments show that within experimental space of 1 m×1 m×1.89 m,the positioning with high precision can be reached in 1.0 m×1.0 m×0.6 m space range,where the effective positioning space is expanded approximately 86.72%in comparison to a fixed gain positioning system.Experiments in a two dimensional plane indicate that in the coverage with low signal intensity,the average positioning error is decreased 47.05%for the dynamic gain system compared with the fixed gain system.The average system error is lowered to be less than 5 cm.The study leads to the conclusion that the positioning space is expanded effectively and the positioning accuracy in the weak light signal region is enhanced while the predefined high accuracy requirement of positioning is promised.

关 键 词：室内定位 可见光定位 非成像法定位 RSS定位 三维定位 

分 类 号：TN929.1[电子电信—通信与信息系统]