Visible light indoor positioning system and method based on mobile phone camera

Abstract

The invention discloses a visible light indoor positioning system and method based on a mobile phone camera. The system comprises a sending terminal subsystem and a receiving terminal subsystem, the sending terminal subsystem comprises a microcontroller, a serial port module, a buffer circuit, an LED drive circuit and an LED light source which are connected in sequence, and the receiving terminalsubsystem comprises a mobile phone with a camera and an indoor positioning module. Firstly, position coordinate information to be transmitted is encoded through the microcontroller; the encoded data stream is cached and then input into the input port of the LED drive circuit, the LED light source is controlled to flicker at a high speed, then light emitted by the LED light source is photographed through a mobile phone to obtain a stripe image with light and shade changes, a dynamic threshold is generated through curve fitting after image clustering to judge whether the information representedby the current brightness is '0' or '1', and coordinate information is obtained through decoding. The method is high in reliability and relatively high in anti-interference capability.

Description

technical field [0001] The invention belongs to the field of optical communication, and relates to a visible light indoor positioning system and a positioning method based on a mobile phone camera. Background technique [0002] Currently, the Global Positioning System (GPS) is the most widely used positioning system. However, because the GPS signal will be blocked by the roof and walls of the building, and the indoor multipath phenomenon is serious, it will be very weak or even disappear indoors, which will lead to a sharp drop in the positioning accuracy of the GPS, usually with an error of tens of meters, which is already difficult. Meet the user's indoor positioning needs. In modern society, people spend most of their time indoors, such as in large shopping malls, underground parking lots, libraries, museums and other large indoor spaces, so there is an urgent need for a more effective and accurate indoor positioning system . [0003] In recent years, the new semicondu...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of inconvenient implementation of visible light communication in the prior art, and provide a visible light indoor positioning system and positioning method based on the mobile phone camera, which uses the working mode of the rolling shutter of the mobile phone camera to receive the visible light information sent by the LED. In order to achieve indoor positioning, it has high reliability and strong anti-interference ability

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