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Visible light positioning method and visible light positioning system based on circular projection

A technology of circular projection and positioning method, which is applied in positioning, radio wave measurement system, measuring device, etc. It can solve the problems of unsuitable consumption level application, affecting positioning accuracy, expensive hardware, etc., and achieve great practical value and high positioning accuracy Effect

Active Publication Date: 2015-03-04
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

However, since the received optical power is usually affected by factors such as the brightness fluctuation of the light source, the scattering and reflection of the signal light, and the light transmission and reception angle, the fluctuation of the received optical power is difficult to overcome. Final Positioning Accuracy
At present, the accuracy of the LED positioning method based on RSS is about 5-10cm, which cannot meet the positioning requirements of higher precision.
On the other hand, the RSS-based measurement and positioning method requires a dedicated high-speed circuit to send and receive data signals, and the hardware required for sending and receiving signals is expensive and complex, which is not suitable for consumer-level applications

Method used

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  • Visible light positioning method and visible light positioning system based on circular projection
  • Visible light positioning method and visible light positioning system based on circular projection

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0022] The principle of the present invention is: for an LED lamp with a circular light-emitting surface, different azimuths below it are projected into different ellipses. Such as figure 1 As shown, when the circular light-emitting surface is perpendicular to the normal of the imaging lens, the circular light-emitting surface C i The center of the circle, image E i The center and the normal of the imaging lens are in a plane S i On (i=1, 2, 3), each plane S i with imaging E i Intersects at E i short axis. Since the three planes S i Intersect on the normal line of the imaging lens, so on the imaging plane, the extension lines of the three minor axes intersect at the point of the imaging lens at the receiving end, determine the coordinates of the projection of this point on the plane where the circular light-emitting surface is located t...

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Abstract

The invention relates to the field of indoor positioning and specifically relates to a visible light positioning method and a visible light positioning system based on circular projection. According to the visible light positioning method, the pointing of the elliptical projection of a circular light-emitting plane at a receiving end is measured and then the horizontal position of the receiving end can be located; the method is capable of stably obtaining relatively high plane positioning accuracy by measuring the pointing of the projection; besides, as imaging detection and algorithm processing can be performed at the receiving end by use of portal devices such as a mobile phone, the hardware is extremely low in cost and convenient to carry; in short, the method has a great practical value.

Description

technical field [0001] The present invention relates to the application field of indoor positioning, specifically a circular projection-based visible light positioning method and system, which measures the direction of the elliptical projection of the circular light-emitting plane on the receiving end through image processing, and then performs horizontal positioning on the receiving end Methods. Background technique [0002] LED (Lighting Emitting Diode) is called the fourth-generation lighting source or green light source. It has the characteristics of energy saving, environmental protection, long life, and small size. It can be widely used in various indications, displays, decorations, backlights, general lighting and urban lighting. Fields such as night scenes are bound to become the next generation of lighting technology. Because LEDs have the advantages of energy saving, safety, and wide available spectrum, they can also be used in wireless optical communication syste...

Claims

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Application Information

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IPC IPC(8): G01S5/16
CPCG01S5/16
Inventor 王元祥刘武杨奇
Owner WUHAN POST & TELECOMM RES INST CO LTD
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