Research On Non-constrained Indoor Localization Method Based On Visible Light Communication

With the development of IEEE 802.15.7 standard for visible light communication,it has great potential in the construction of intelligent communication links,and has been widely concerned by academic and industry.Light-emitting diode,which is widely used in lighting,can be used to transmit data information by modulating the light.Ubiquitous smart mobile devices can capture a high frequency light pattern,which further increases the feasibility of building visible light communication links.In this paper,according to the theory of visible light beacon localization,a visible light localization method based on the analysis of COMS camera image is proposed.The main research contents are divided into the following four aspects:First of all,the basic principles and shortcomings of indoor positioning methods based on visible light communication are summarized and analyzed.The OOK-Manchester is used to encode and modulate LED lights,so that the beacon information can be transmitted effectively.The flicker also can be avoided.High-frequency visible light information then received by means of the rolling shutter.Secondly,the stripe width threshold ratio algorithm is proposed,solving the problem of decoding data caused by the diversity of digital camera,By using the preamble as a reference threshold and obtainning the position from the fringe image,the visible light communication link can be universal.Thirdly,the distance between the light source and the mobile device is estimated based on the camera geometry,and then make this distance as constraint conditions,the location of device can be determined by using the approximate sensing positioning and trilateration.The indoor visible light positioning is realized.Finally,deploying experimental environment and collecting experimental data,the validity and accuracy of the method are evaluated by analyzing the experimental data.