Polarization-based visible light positioning method and hardware system thereof

Abstract

The present invention discloses a polarization-based visible light positioning method and a hardware system thereof. Based on a polarization modulation technology, a light beam emitted out by a lamp generates the polarized light beams of different colors and different polarization directions via an emission end, a first polaroid at the emission end converts the non-polarized light emitted out by the lamp into the polarized light, a liquid crystal layer carries out the binary color shift keying (BCSK) modulation on the polarized light, and a dispersor disperses the polarized light emitted out by the liquid crystal layer into the polarized light of different colors. At a reception end, the light beam passes a second polaroid, only one beam of polarized light passes, the polarized light of other directions are filtered, and the polarization change of the light is transformed into the brightness change, thereby being captured by an image device accurately. By combining a camera-based angleof arrival (AOA) positioning algorithm, the higher-precision positioning is realized. According to the present invention, the calculation difficulty of the system can be reduced, the visible light positioning precision is improved, and the polarization-based visible light positioning method and the hardware system thereof are suitable for the electronic mobile terminal equipment, such as the intelligent mobile phones, the tablet personal computers, the Google glasses, etc.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, in particular to a polarization-based visible light positioning method and a hardware system thereof. Background technique [0002] Visible light communication is a technology that can build a wireless communication network by adding data transmission functions to basic public lighting facilities. Compared with traditional wireless communication technology, visible light communication technology has rich bandwidth resources, is free from electromagnetic interference, and takes into account both lighting and positioning. Etc. [0003] Due to the influence of multipath effect and path loss, traditional GPS navigation and positioning cannot meet people's requirements for positioning accuracy. Therefore, a series of indoor positioning systems based on Bluetooth, WIFI, ultrasound, and infrared have appeared, but due to the problems of positioning accuracy and installation ...

AI Technical Summary

Problems solved by technology

[0004] In the existing visible light positioning system based on intensity modulation, considering the flickering effect of light intensity caused by atmospheric turbulence, the transmitting end needs to provide high-speed pulses to avoid the adverse effects caused by strong light flickering, so the receiving end of the system needs quite complicated equipment to meet For the detection and reception of high-rate pulses, the construction cost of the system increases and brings a serious burden to the realization of the system

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