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Indoor visible light positioning system and method

A positioning method, visible light technology, applied in positioning, transmission systems, short-distance systems, etc., can solve the problems of not considering the influence of multipath effects of light blocking

Inactive Publication Date: 2016-03-23
QUANZHOU INST OF EQUIP MFG
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  • Abstract
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Problems solved by technology

However, this method directly defines the use of equilateral triangles to estimate the coordinate position of the receiving end, without considering the occlusion of light and the influence of multipath effects during signal propagation

Method used

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  • Indoor visible light positioning system and method
  • Indoor visible light positioning system and method
  • Indoor visible light positioning system and method

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Embodiment Construction

[0047] The implementation of the present invention will be further described in detail below according to the drawings and examples.

[0048] An indoor visible light positioning method of the present invention, such as Figure 5 As shown, it is realized through the following steps:

[0049] Step 1: Serial-to-parallel conversion is performed on the bit sequence of the binary position information of each LED lamp to obtain multiple parallel binary position information, and the multiple parallel binary position information is modulated onto mutually orthogonal subcarriers to obtain multiple Channel parallel modulation position information;

[0050] Step 2: Perform inverse discrete Fourier transform, add cyclic prefix, and parallel-serial conversion on the multi-channel parallel modulation position information obtained in step 1, respectively, to obtain modulated and encoded signals, and then respectively pass the corresponding modulated signals through the drive circuit. The co...

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Abstract

The invention discloses an indoor visible light positioning system. The indoor positioning technology is completed jointly by combination of an LED lamp, a hand-held receiving terminal, and a positioning algorithm. Position information is modulated on a carrier wave distributed to the LED lamp and reverse fast Fourier transform is carried out; a signal is sent into a drive circuit and then the signal is transmitted to an air channel in a visible light mode by free space. A receiving terminal carries out light convergence by an optical lens; the signal is converted into an electric signal; fast Fourier transform is carried out and digital demodulation is carried out; and according to information of three detected strongest powers, a distance between the receiving terminal and the LED lamp is estimated by a lambertian model. According to position coordinate information of a carried transmitting terminal and estimated distance information, a receiving coordinate is calculated finally and positioning is carried out. According to the invention, communication reliability is enhanced; the positioning precision is improved; and the interference of communication between LED cells is effectively resisted.

Description

technical field [0001] The present invention relates to the field of indoor visible light communication positioning technology, in particular to a visible light positioning system based on OFDM Background technique [0002] With the rapid development of multimedia services, people's demand for positioning and navigation is increasing, especially in complex indoor environments, such as airport halls, warehouses, supermarkets, underground parking lots, mines, etc., it is often necessary to determine whether the mobile terminal or its Indoor location information of occupants, facilities, and objects. Outdoor positioning can use the Global Positioning System (GPS) to estimate the location information of the receiving terminal by receiving 4 or more satellite signals. However, for indoor environments, the positioning accuracy and sensitivity are seriously reduced due to the influence of obstacles and buildings. Although technologies such as radio frequency identification (RFID)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/16H04B10/114H04B10/116
CPCG01S5/16H04B10/1141H04B10/116
Inventor 林邦姜汤璇张士灏李艺伟
Owner QUANZHOU INST OF EQUIP MFG
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