Visible light indoor positioning system and method based on FFT (fast Fourier transform) algorithm

An indoor positioning and visible light technology, applied in positioning, radio wave measurement systems, measuring devices, etc., can solve the problems of inconvenient portability of the hardware platform, low positioning accuracy, and large interference of indoor background light, and achieve real-time performance and accuracy Requirements, improved positioning accuracy, and flexible light source layout

Pending Publication Date: 2018-11-13
CHANGAN UNIV
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Problems solved by technology

Among them, LED visible light communication technology has the advantages of high energy efficiency, green environmental protection, not affected by electromagnetic interference, and has both lighting and positioning functions. question

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  • Visible light indoor positioning system and method based on FFT (fast Fourier transform) algorithm
  • Visible light indoor positioning system and method based on FFT (fast Fourier transform) algorithm
  • Visible light indoor positioning system and method based on FFT (fast Fourier transform) algorithm

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0033] See figure 1 , The present invention provides a visible light indoor positioning method based on FFT algorithm. The system hardware to implement the method mainly includes a multi-white LED emitting end modulation module, a weak light signal detection module, a core control unit, a power supply circuit (power supply module), and liquid crystal Display module. The invention uses STM32F103C8T6 single-chip microcomputer as the core control element, closely cooperates with each part of the functional circuit, collects light signals through silicon photocells, and obtains the position information of the receiving end after processing by the single-chip microcomputer, and displays it on the LCD screen in real time to ensure accurate indoor positioning . Using multiple light sources as the signal source can effectively avoid the occlusion and attenuation of ...

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Abstract

The invention provides a visible light indoor positioning system and method based on an FFT (fast Fourier transform) algorithm. The system mainly comprises a multi-white-LED transmitter modulation module, a weak light signal detection module, an indoor positioning algorithm and a liquid crystal display module. According to the system and method, mixed optical signals of light emitted by LEDs of different frequencies in indoor space are received and collected by a photosensitive sensor, optical signals after preprocessing are subjected to spectral analysis with the FFT algorithm so as to distinguish strength of the optical signals at different point locations and estimate distance between a transmitter and a receiver with stronger signals, and position information of the receiver is obtained by solving with a trilateral positioning algorithm. With the adoption of the system and the method, requirements of indoor positioning for real-time property and precision can be met very well, indoor positioning of visible light is realized under the condition of guarantee for normal illumination, and positioning precision and stability are guaranteed.

Description

Technical field [0001] The invention relates to the field of visible light indoor positioning, in particular to a visible light indoor positioning method based on FFT. Background technique [0002] The successful development of outdoor positioning technology based on satellite positioning systems (for example, Global Positioning System GPS) has stimulated the development and research of indoor positioning technology. However, GPS and other satellite positioning technologies cannot be used to achieve positioning indoors. Therefore, a technology that can achieve indoor positioning without relying on satellite signals is needed. [0003] There are several commonly used indoor positioning technologies including infrared, ultrasonic, Bluetooth, radio frequency identification, WIFI, and LED visible light communication. Among them, the LED visible light communication technology has the advantages of high energy efficiency, green environmental protection, unaffected by electromagnetic int...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/16
CPCG01S5/16
Inventor 王会峰倪敬雪高荣柴彩萍关丽敏穆柯楠
Owner CHANGAN UNIV
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