Research On Data Processing Of Two-point Positioning Method Of Indoor Visible Light

With the development and progress of modern production and life,the demand for indoor positioning of people is increasing day by day.The indoor positioning technology has become a current research hotspot.Visible light indoor positioning technology has the advantages of high energy efficiency,low cost,green environmental protection,good confidentiality and no interference from electromagnetic radiation,so it has become a research topic in the field of indoor positioning.The indoor visible light positioning algorithm based on the received signal strength is the most widely studied type of visible light indoor positioning algorithm,but it needs to be combined with the trilateral positioning method to complete the positioning.The positioning environment requires more than 3 non-collinear transmitters,so there are restrictions on application scenarios.An indoor two-point positioning algorithm based on visible light communication is proposed in this paper,using two light-emitting diodes as transmitters and three photodiodes as receivers,which can effectively overcome the requirements for multi-lamp environments in positioning.The main research work is as follows:1.An indoor visible light two-point positioning algorithm based on the received signal strength is proposed.The possible geometric solutions of the coordinates are calculated using the positional geometric relationship between the transmitter,the receiver,and the receiver,and the judgment is set based on the characteristics of the triangle's own relative position.According to the data,it is finally determined that the true solution of the coordinates completes the positioning.In the simulation experiment without noise reduction processing,the receiving end of a moderate size is in an indoor environment of 5m×3m×3m,and the positioning accuracy of more than 55% of the area is within 25 cm.2.A weighted optimized indoor two-point positioning algorithm for visible light is proposed.The average weighted operation is introduced to improve the utilization of the operation data.In a simulation experiment,the range of the in-situ rotation before weighting can be up to 12 cm,and the weight difference can be controlled within 3cm,and the average positioning error can be reduced by 7cm.In the jitter simulation experiment,the positioning error of the algorithm after weighting under the same tilt angle is smaller,and the average error is reduced by 12.83 cm.When the jitter is slightly(<10°),the positioning error is basically controlled within 30 cm.3.For the FPGA implementation of the two-point positioning algorithm for indoor visible light,a data budget module,a positioning calculation module,and a data comparison module were designed using Verilog language,and the timing of the overall function implementation of the algorithm was simulated.From the simulation results,the expected goal of the design can be achieved.