Visible light positioning system, method and device based on single photon

Abstract

The invention discloses a system, a method and a device for visible light positioning based on a single photon. A specific embodiment of the system includes: a light source emitting array and a terminal positioning platform, wherein the light source emitting array radiates a modulated light signal having a characteristic contour, and the terminal positioning platform receives the modulated light signal, to generate a photon arrival time sequence; performing period folding on the photon arrival time sequence, extracting the measured characteristic contour for identifying a light source number;decontaminating the photon arrival time sequence, extracting the measured characteristic contour, and performing phase comparison with a standard characteristic contour, to obtain a time delay observed quantity; using a receiving photon flow positioning algorithm, to perform initial positioning on the positions of the terminal positioning platform, and together with the time delay observed quantity which is used as a parameter, using iterative resolving of a single photon positioning measurement equation, to determine a high-precision position parameter of the terminal positioning platform. The scheme can realize high-precision positioning of the terminal under long-distance or extremely low-light conditions.

Description

technical field [0001] The present application belongs to the technical field of autonomous navigation, and in particular relates to a single photon-based visible light positioning system, method and device. The invention is suitable for high-precision positioning of visible light in a long-distance or low-light environment. Background technique [0002] The wavelength of visible light is between 400nm and 760nm, but due to the absorption and scattering of this frequency band in the earth's atmosphere, the traditional visible light positioning technology has shortcomings such as short distance, low accuracy, and no response in weak light environments, which cannot provide users with Provide reliable and convenient positioning services. In particular, in low-light environments with high loss of visible light such as underwater, rain and fog, and mines, traditional visible light positioning technology is greatly limited. Therefore, from the perspective of practical engineeri...

AI Technical Summary

Problems solved by technology

This scheme is simple and easy to implement, but it has the following three deficiencies: one is the lack of single-photon detection technology, which cannot eliminate the influence of the background noise of the detector and realize the detection of extremely weak light signals; the other is the lack of photon counting technology, which cannot Eliminate the influence of the electronic response width of the detector and improve the positioning accuracy; the third is the lack of a contour folding module, which cannot use the characteristic contour folding technology to improve the signal-to-noise ratio of the measurement signal, resulting in the inability to achieve long-distance positioning in visible light

At the same time, the existing system and method for visible light positioning, "A Visible Light Positioning System and Method Based on Mine Roadway Lights" (Patent No.: 201710577094.2), does not solve the problem of positioning under low-light conditions; Indoor positioning and navigation system for attenuation film" (Patent No.: 201611218885.8) and "Indoor positioning method and system based on image matching and contour library for printed visible light" (Patent No.: 201610125773.1), both lack single-photon detection, photon counting and contour folding, etc. The module cannot realize positioning in special scenarios such as underwater, rain and fog, and mines

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