| Summary: | 碩士 === 國立雲林科技大學 === 電子工程系 === 105 === Global Positioning System (GPS) has been developed for many years and is widely used in various fields. It provides users with instant access to location information via smart devices. But GPS in the indoor environment is vulnerable to the shadow of complex buildings and multi-path effects, resulting in loss of GPS positioning function. Most people live in the indoor environment for more than 80% of the time, so the demand for indoor positioning system, has become an important issue.
In this thesis, Visible Light Communication (VLC) technology combined with ARM Microcontrollers and Smartphone devices is integrated to serve as lighting, com-munication and positioning. To make the positioning system easy to be implemented in the Smartphone, the Audio Jack port is used to connect smartphone with VLC receiver. We use the Received Signal Strength Indicator (RSSI) to determine the distance be-tween the reference point and the target point in the indoor environment. And the loca-tion of the target point is estimated by the trilateral measurement and location method of the intelligent mobile phone, and finally the indoor positioning result is presented in the intelligent mobile phone.
We use time division multiplexing (TDM) technology in the VLC system for timing management, to avoid interference from adjacent lights. Finally, the indoor location measurement results in the prototype positioning system show the maximum position error of 3cm and the average position error of 1.86cm. It can be concluded that the VLC-based Smartphone indoor positioning system can accurately estimate the location of the user in the indoor environment by using the Smartphone.
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