Positioning method of horizontal moving light source in traffic tunnel based on white light LED

Abstract

The invention relates to a method for positioning a horizontally moving light source in a traffic tunnel based on a white light LED, comprising: installing three or more optical signal receivers on the top of the traffic tunnel, and the position coordinates of each receiver are known; monitoring the incident light intensity of the white light LED , the monitoring data is obtained and sent to the convergence center, a single receiver can only determine the position range of the moving positioning object in a certain arc range, and the arc width is determined by the preset illuminance error threshold; it is determined by the received incident light signal The arc range of the superimposed part of the three strongest receivers determines the position of the positioning object at a certain point in time; the receiving range of each receiver should meet the monitoring of all vehicles within a circular range with a radius of 1.5 times the lane width; the LED light source must be Evenly distributed on the top of the positioning object, the angle is vertically upward.

Description

technical field [0001] The invention relates to the technical field of visible light communication, in particular to a positioning method for horizontally moving light sources in traffic tunnels based on white light LEDs. Background technique [0002] With the development and progress of LED light source technology, white LEDs with the advantages of high brightness, low power consumption, and long life have gradually replaced fluorescent lamps and incandescent lamps. Due to the convenient modulation and quick response of white light LED communication, it has obvious advantages compared with infrared, ultraviolet, radio frequency and other methods in terms of harmless radiation, confidentiality and stability. It has become an emerging visible light communication (VLC) method, which is being gradually promoted to positioning field. The existing LED positioning method can maintain the stability of the channel and has strong operability, but there is no specific model for the t...

AI Technical Summary

Problems solved by technology

These characteristics make users face many problems in terms of large differences between positioning data and actual mobile behavior, and wrong determination of mobile device status.

And for the positioning object, it is more difficult to locate the internal signs of the mountain or underground traffic tunnel online map than the ground road, which brings a huge challenge to the normal operation of the positioning terminal

Due to the low accuracy of GPS positioning in the tunnel and the moving state of the positioning object will seriously affect the effectiveness of positioning, it has become a method to study how to make full use of incident light to determine the behavior characteristics of moving targets, avoid or reduce interference, and avoid mobile positioning delays and errors. The great challenge faced in the design of the positioning system

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