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Visible light positioning method resistant to NLOS interference

A positioning method and visible light technology, applied in the field of visible light communication, can solve the problems of high requirements for hardware equipment, high cost, distance error between the transmitter and receiver, etc.

Pending Publication Date: 2018-04-17
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The traditional TDOA algorithm requires a precise time detection device, which requires high hardware equipment and is very expensive. Because the speed of light is very fast, when there is a slight error in the detected time, the distance between the transmitting end and the receiving end will appear relatively large. big error

Method used

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  • Visible light positioning method resistant to NLOS interference
  • Visible light positioning method resistant to NLOS interference
  • Visible light positioning method resistant to NLOS interference

Examples

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Embodiment 1

[0048] A visible light localization method against NLOS interference. like figure 1 , this is a room of 5m*5m*3m. The LEDs participating in the positioning are located at the four corners of the square and are LED1, LED2, LED3, and LED4 respectively; the coordinates of the receiving end are (x, y); d is the distance from the emitting end to the receiving end; the four LEDs are located at the top corners of the room, Measuring the time it takes for the signal to arrive at the monitoring station allows the distance to the source of the signal to be determined. The initial position is estimated by using chaos optimization algorithm, combined with Taylor series expansion algorithm to recursively calculate the position of the receiving end to obtain the final precise positioning point.

[0049] A kind of anti-NLOS interference visible light positioning method of this example, it comprises the following steps:

[0050] Step 1. Modulate the input signal with the ID information of ...

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Abstract

The invention discloses a visible light positioning method resistant to NLOS interference. A traditional TDOA based VLC positioning algorithm needs an accurate time detector, has high requirements forhardware equipment and is high in cost. In the aspect of reception algorithms, a positioning algorithm resistant to NLOS interference is used, a chaotic optimization algorithm is used to estimate aninitial position, a Taylor series expansion algorithm is combined to carry out recursive operation of a reception-end position, and a final accurate positioning point is obtained. Compared with a traditional reception-end positioning algorithm, the chaotic algorithm is more accurate in positioning and has lower errors. Under the condition of the same facilities, illumination requirements are met,a higher positioning service with higher precision than the traditional method can be provided, and the application prospects are wider.

Description

technical field [0001] The invention relates to visible light communication technology, in particular to a visible light positioning method against NLOS interference. Background technique [0002] At present, GPS outdoor positioning technology is very mature and widely used in various fields, which greatly stimulates the development and research of indoor positioning technology. However, in buildings, densely populated cities, under bridges, underground and other environments, due to the influence of multipath fading and the interference of other wireless devices, the signal coverage of GPS in buildings is poor, and there is a large problem for indoor positioning. error. In the past ten years, various technology giants and research institutions have carried out a lot of research on indoor positioning technology, and many new technologies have emerged, such as assisted GPS (A-GPS) based on mobile communication networks, pseudolite (Pseudolite), Wireless local area network (...

Claims

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Application Information

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IPC IPC(8): H04B10/116G01S5/16
CPCH04B10/116G01S5/16
Inventor 关伟鹏彭淇吴玉香谢灿宇
Owner SOUTH CHINA UNIV OF TECH
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