Vehicle distance measurement method based on visible light communication

An optical communication and vehicle technology, applied in the field of intelligent transportation, can solve problems such as LED communication not involved, and achieve the effect of low cost and simple technology

Inactive Publication Date: 2009-04-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, none of the above studies involve the concept of distance measu

Method used

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  • Vehicle distance measurement method based on visible light communication
  • Vehicle distance measurement method based on visible light communication
  • Vehicle distance measurement method based on visible light communication

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Experimental program
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Embodiment Construction

[0029] System composition:

[0030] The main body is the vehicle and the traffic flow formed by the vehicle. A camera is installed at the front of the car, and LED taillights are installed on both sides of the rear of the car. In addition to the conventional imaging function, the camera can also receive the modulated light signal of the LED from its image sensor and output information, and has an image processing function. In addition to conventional indication and lighting functions, LED taillights can also emit modulated signals, which carry specific information.

[0031] working environment:

[0032] Various roads and related surrounding facilities, including complex overpasses, urban areas, especially expressways, etc.

[0033] A detailed description:

[0034] LED taillights are generally composed of multiple high-brightness LED units, which can be arranged in various ways. figure 1 That is one of the structures, wherein 1-1 is a substrate for fixing multiple LEDs, and...

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Abstract

The invention provides a vehicle interval measurement method based on visible-light communication. Vehicle interval measurement is a basic function needed in an intelligent transportation system. The method adopts the visible-light communication and an image processing method to measure interval between vehicles. A pair of LED tail lights of a front vehicle transmits a modulation optical signal comprising an identity mark, the width of a vehicle body, the interval between the tail lights and other information backwards; a back vehicle utilizes an area-array photoelectric sensor to acquire an image of the front vehicle and receives the optical signal transmitted by the front vehicle; and the interval, relative velocity and relative position between two vehicles are calculated according to extracted communication information and the positions of two vehicle lights in the image.

Description

technical field [0001] The invention belongs to the technical field of intelligent transportation, and specifically relates to a method for measuring vehicle distance, relative vehicle speed and relative position by using a communication network composed of LED vehicle lights and area array photoelectric sensors. Background technique [0002] In the intelligent transportation system, the distance between vehicles and the relative speed and position information between vehicles are the main basis for realizing the intelligent traffic safety control algorithm. Various vehicle active safety technologies, such as forward collision warning system, forward active collision avoidance system, adaptive cruise control system, etc., measure the distance, relative speed and relative information such as orientation, and transmit it to the control unit of the system for implementation. [0003] At present, the ranging methods used in automobiles mainly include ultrasonic short-distance r...

Claims

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Application Information

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IPC IPC(8): G01C3/00H04B10/00G08C23/04
Inventor 樊凌涛杜鹏懿汪顺钱西那栾英杰
Owner EAST CHINA UNIV OF SCI & TECH
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