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Triangular positioning system and method based on visible light

A technology of triangulation positioning and visible light, which is applied in positioning, radio wave measurement systems, measuring devices, etc., can solve the problems affecting ranging and positioning accuracy, lack of accurate and operable light incident angle measurement methods, difficult signal synchronization and time measurement and other problems, to achieve the effect of convenient synchronization and control, and simple hardware

Inactive Publication Date: 2016-04-06
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

Various methods have their own advantages and disadvantages: In the RSS-based measurement scheme, the received optical power is usually affected by factors such as the brightness of the light source, the scattering and reflection of signal light, the angle of light transmission and reception, and background light interference, which directly affects the performance of ranging and positioning. Accuracy; in the AOA-based measurement scheme, there is a lack of accurate and operable light incident angle measurement method; in the TOA-based measurement scheme, it is difficult to accurately realize signal synchronization and time measurement

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  • Triangular positioning system and method based on visible light
  • Triangular positioning system and method based on visible light
  • Triangular positioning system and method based on visible light

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 As shown, the target to be positioned uses LED lights to send visible light signals, and at the signal receiving end there are at least three photodetectors with known coordinates to receive the light signals from the LED lights at the same time. figure 1 Among them, D1, D2, and D3 are three photodetectors distributed unevenly. The sending frequency of the LED lights at the sending end is ω 1 , the initial phase is q 1 The sine wave of sin(ω 1 t+q 1 ). There are two different optical detectors D1 and D2 at the receiving end, and the optical signal received by D1 is expressed as: S 1 =A 1 sin(ω 1 t+ω 1 t 1 +q 1 ), where A 1 is the gain, t 1 is the transmission delay of the optical signal to the photodetector D1. The optical signal received by the optical detector D2 is expressed as: S 2 =A 2 sin(ω 1 t+ω ...

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Abstract

The invention belongs to the technical field of communication and space positioning, and especially relates to a triangular positioning system and method based on visible light. A to-be-positioned target employs an LED lamp for transmitting a visible light signal, and a signal receiving end employs a plurality of light detectors with known coordinates and receives a light signal from an LED. The light detectors enables measured signals to be gathered in a processing unit, and the phase difference is calculated, thereby obtaining an optical path difference from the LED to the plurality of light detectors. The coordinates of the signal receiving end can be calculated according to the triangle geometric principle. According to the invention, a transmission end is simple in hardware, and can be extended to a plurality of positioning targets. Moreover, all calculation and processing can be completed at the receiving end, thereby facilitating the synchronization and control. Therefore, the system and method are low in cost and are wide in application range.

Description

technical field [0001] The invention belongs to the technical field of space positioning, and in particular relates to a triangulation positioning system and method based on visible light. 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, small size, etc., and has been widely used for indication and lighting. As the LED as a semiconductor light source can also achieve high-speed modulation, and the visible light band as an optical carrier can realize wireless communication, the LED technology for visible light communication has become increasingly mature in recent years. [0003] LED-based positioning is a potential application direction of visible light communication. Due to the flexible placement of LEDs and wide coverage, the distance from the detection point to the LED can be accurately known by means of visibl...

Claims

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Application Information

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