Indoor visible light visual positioning method and hardware system thereof

Abstract

The invention discloses an indoor visible light visual positioning method and a hardware system thereof. The method comprises the following steps: allowing a transmitting end LED lamp to emit a modulated optical signal; allowing a receiving end of a mobile device to use a CMOS image sensor to acquire the optical signal to form images having different light and dark stripe widths; using the multi-iteration average manner to eliminate background light disturbance of the images received by the image sensor; acquiring an image frequency domain signal by using fast Fourier transform (FFT), and filtering the image frequency domain signal; selecting a peak frequency from the processed image frequency domain signal as a frequency value corresponding to the lamp ID; comparing the peak frequency with a frequency-coordinate database in a positioning server to acquire coordinates of the lamp, and completing an image decoding process; and finally realizing positioning of the receiving end of the mobile device through the reception angle (AOA) positioning algorithm. The method can increase the distance of demodulating the visible light signal, improve the information detection performance of thereceiving end of the mobile device, and further improve the precision of the visible light positioning system.

Description

technical field [0001] The invention relates to visible light communication technology, in particular to an indoor visible light vision 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 technologies, visible light communication technology has the advantages of rich bandwidth resources and no electromagnetic interference. Due to the influence of multipath effect and path loss, traditional GPS navigation and positioning cannot meet people's requirements for positioning accuracy. Other indoor positioning systems based on Bluetooth, WIFI, ultrasound, and infrared have not been widely used due to positioning accuracy and installation costs. [0003] Visible light positioning is a technology to improve the accuracy of indoor positioning. ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art, and provide an indoor visible light positioning method, which can effectively overcome the influence of background light disturbance on the positioning stability and the poor accuracy of identifying and detecting bright and dark stripes in the existing camera-based visible light positioning system. The problem

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