Design And Research Of Indoor Positioning System Based On Infrared Beacon Technology

As the demand for location-based services continues to improve,the research on autonomous positioning is urgent.However,nowadays,there is a problem of high design cost in indoor positioning research both at home and abroad,which makes indoor positioning technology unable to be popularized.In this paper,the service robot is taken as the research background,and an indoor positioning system based on infrared beacon is designed and studied through an improved imaging positioning algorithm.To STM32F407 as the control center to build a set of low-cost positioning device.First of all,draw lessons from visible light communication of imaging sensor,an active infrared beacon is designed.Each infrared beacon has a unique 16-digit ID number.Each bit of ID code is made up of 0 or 1,0 represents the low lev el,1 represents the high level,consult the data format of the asynchronous communication,set the initial bit 10101,then the data bit,there is no parity bit,finally Is 000 stop bit.Each beacon code will have 8 bits to represent its ID value,up to 256 different ID signals can be transmitted.The design of the beacon is simple,low cost,good scalability and can meet indoor environments of different sizes,and the beacon identification is relatively simple.Secondly,by matching the flickering frequency of the infrared beacon to the camera's exposure time,the camera can capture the beacon on-off change.Each frame of image uses the field interrupt and line interrupt to collect the required pixels,then synthesizes a beacon ID map,and finally performs image processing to interpret the beacon ID value.Thirdly,by establishing the positioning model and the noise model,the main factors affecting the imaging positioning are analyzed,and an improved imaging positioning principle is proposed——based on the pixel distance weighted indoor imaging positioning.The positioning method is simple in principle and the positioning result is ideal.In the simulation experiment of 4 square meters,the positioning error does not exceed 10 cm and the error fluctuation does not exceed 5 cm.Finally,based on the embedded platform,an indoor positioning device is designed and a positioning error experiment is carried out.The infrared beacon design is verified through experiments.At the same time,it is shown that the b ased on the pixel distance weighted indoor imaging positioning can be combined with infrared beacon to achieve indoor positioning.