Indoor Positioning System using Light Emitting Diode

Jun Kit Foong, Y. C. See, O. Ng
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Abstract

Visible light communication (VLC) is a kind of wireless data transmission that delivers data through visible light modulation. Considering this, VLC is used in an indoor positioning system (IPS). This paper explores the concept of VLC in IPS by constructing a hardware system. The proposed system comprises four transmitter circuits with a Bridgelux light-emitting diode modulated to four unique frequencies by 555 timers. A receiver circuit with an STM32F401C discovery board which has an ARM Cortex M4 microcontroller, is connected to an OPT101 photodiode. On the received analogue optical signal, the microcontroller will perform an Analogue-to-Digital Conversion and Fast Fourier Transform (FFT). The FFT's Received Signal Strength (RSS) is fed into a Lambertian optical wireless direct current gain. The distance and position of the photodiode receiver in relation to the LED transmitters are calculated using trilateration technique. Without external ambient illumination, the suggested system can achieve an average location accuracy of 0.2321 m.
利用发光二极管的室内定位系统
可见光通信(VLC)是一种通过可见光调制传输数据的无线数据传输方式。因此,VLC被用于室内定位系统(IPS)。本文通过构建一个硬件系统来探讨VLC在IPS中的概念。所提出的系统包括四个带有电桥发光二极管的发射电路,通过555个计时器调制到四个独特的频率。带有带有ARM Cortex M4微控制器的STM32F401C发现板的接收器电路连接到OPT101光电二极管。对接收到的模拟光信号,微控制器将执行模数转换和快速傅立叶变换(FFT)。FFT的接收信号强度(RSS)被输入到朗伯氏光学无线直流电增益中。利用三边测量技术计算了光电二极管接收器相对于LED发射器的距离和位置。在没有外界环境光照的情况下,该系统的平均定位精度为0.2321 m。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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