Visible light positioning system and method based on light shadow and machine learning
A positioning system and positioning method technology, applied in positioning, radio wave measurement systems, instruments, etc., can solve the problems of rare research on passive positioning systems, and achieve the effect of simple devices
Inactive Publication Date: 2020-02-21
TIANJIN UNIV
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Problems solved by technology
However, very little research has been done on passive positioning systems for visible light
In 2013, Xufei Mao et al. proposed a scheme of laying light sources and photodetectors on both sides of the wall to passively locate the target, but this scheme is suitable for positioning in narrow corridors, and is not suitable for places with large areas
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[0022] The invention will be further described in detail below in conjunction with the accompanying drawings in the description. This example is only limited to illustrating an implementation method of the invention, and does not represent a limitation on the scope of coverage of the invention.
[0023] Such as figure 1 Shown is a schematic diagram of the scene of the visible light passive positioning system of the present invention. In the area to be located, four LED light sources are installed on the roof, and the LED light sources are controlled by the light source control module to emit light signals with ID codes at different time slots. The ground of the area to be positioned is divided into grids with an interval of 0.3m. Photodetectors, preprocessing modules and wireless communication modules are arranged at the intersection of grid lines. , the corresponding wireless communication module will communicate with the data convergence module. The wireless communication ...
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The invention relates to a visible light positioning system based on illumination shadow and machine learning. The visible light positioning system comprises a plurality of photoelectric detectors, a plurality of LED light sources, a light source control module, a wireless communication module and a central processor, wherein the plurality of photoelectric detectors are arranged at different positions on a floor of a positioning region; the plurality of LED light sources are arranged at different positions above the positioning region; the light source control module is used for controlling the LED light sources in the positioning region to emit light signals having identity mark codes at different time slots; the wireless communication module is used for transmitting light intensity information (with light intensity changes greater than a preset threshold value It) processed by means of a preprocessing module to the central processor; and the central processor obtains position information of a positioned target through detecting a shadow link of the positioned target corresponding to each LED light source. The invention further provides a positioning method implemented by adopting the visible light positioning system.
Description
technical field [0001] The invention relates to a visible light positioning method and system based on occlusion shadows and machine learning, belonging to the technical field of positioning. Background technique [0002] Today's indoor positioning systems are very rich and diverse, and generally locate indoor targets by arranging WIFI, ultrasonic, Bluetooth, infrared and other devices in the indoor environment. However, these technologies have some disadvantages. For example, the positioning system based on WIFI and Bluetooth is greatly affected by multipath, the positioning accuracy is low, and electromagnetic waves will have a certain impact on precision instruments. The speed of sound is easily affected by environmental factors such as temperature and humidity, so when the environmental factors change, the accuracy of the ultrasonic positioning system will decrease accordingly. The high cost of infrared positioning equipment is not suitable for large-scale layout. [0...
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IPC IPC(8): G01S5/16
CPCG01S5/16
Inventor 刘开华张帅张云蕾马永涛张瑞峰
Owner TIANJIN UNIV