The Design Of Indoor Positioning System Based On Visible Light And Realized On Mobile Terminal

With the vigorous development of the mobile internet technology and the popularity of intelligent mobile terminal,a variety of indoor scene location-based services play an important role in People's Daily life.In this paper,we put forward an indoor positioning system,and apply to the mobile terminal.The method can keep effective,faster and good environmental adaptation ability,which has the good development prospect.Firstly,this paper analyzes the several common indoor positioning technologies and the location methods.Then we put forward a system,which using visible light communication and adjacent information in mobile terminal to realize the indoor localization.The transmitter uses LED light as visible light source,with different position sending different light signals.The receiver uses mobile terminal camera to capture the light flicking information.Using image processing to identify different light source,getting their nearest location of LED light,which we define it as the mobile terminal location.This paper mainly introduces the realization of the visible light positioning processing on mobile terminal.Transmitter using the home LED light source embedded modulation module,which send specific frequency information according to the communication protocol.At the receiving end,we use the CMOS camera to collect source image.Because when the camera's rolling shutter shoot high level movement object,it will produce jelly effect.When the phone capture light source images,it can present stripe information.Putting mobile terminal under a LED lights to capture image,stripe width can be obtained by image processing process.According to mathematical relationship existed between the stripes and the frequency of the light,we can calculated light blinking frequency.corresponding relationship in communication protocol of the frequency and the position of,the position can be achieved.This paper introduces the realization of the positioning system on mobile terminal,setting up the experimental platform,and setting up multiple light on the platform.Using Huawei Honor6 X mobile phone as a receiver,we designed the mobile terminalpositioning software interface to display result.We measured positioning performance when the height is different between light and mobile terminal.Results show that in the range of the light source cover when height is 2 meter,the probability of correctly identify the light ID information is more than 80%.The consumption of positioning system time is short,less than 1.5 s.And positioning results will not be influenced by mobile terminal different angles and environmental light.All of these show that the system is effective,faster and well-adapt the environment.