Multi-PD positioning method and system based on LiFi technology

A positioning system and positioning method technology, applied in the field of communication, can solve the problems of high time accuracy requirements, inability to realize high-speed data transmission, slow speed of camera image sensor, etc., to achieve high-speed data transmission, good real-time performance, and simple method Effect

Pending Publication Date: 2020-07-14
苏州碧林威智能科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] However, the communication method using the camera as a receiver is not compatible with the LiFi protocol, which will slow down the speed of the camera image sensor and cannot achieve high-speed data transmission; while the communication method using a photodiode as a receiver requires accurate time synchronization between the receiving end and the sending end. High requirements on time precision

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  • Multi-PD positioning method and system based on LiFi technology
  • Multi-PD positioning method and system based on LiFi technology
  • Multi-PD positioning method and system based on LiFi technology

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Such as Figure 4 As shown, the flow chart of the multi-PD positioning method based on the LiFi technology in this embodiment.

[0033] A multi-PD positioning method based on LiFi technology, comprising the following steps:

[0034] (1) The LiFi terminal sends a positioning request to the LiFi AP receiving end, and at the same time sends the terminal modulation and demodulation time interval Δt and the terminal ID to the AP.

[0035] (2) The AP allocates the specified downlink measurement time slot SL according to the reported terminal ID i .

[0036] (3) The AP sends the known S in the designated measurement slot t signal, S t The signal is sent to the terminal receiver PD through the visible light LED and sent to the AP ranging module at the same time.

[0037] (4) The terminal turns on the switch K in the specified measurement ...

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Abstract

The invention relates to a multi-PD positioning method and system based on the LiFi technology. A light reflection path is provided according to a laser pulse distance measurement principle. A distance measurement module is introduced, each PD at the LiFi AP receiving end performs coherent detection according to the known sending signal and the received signal, the accurate position information ofeach PD and the terminal is further obtained, the accurate spatial position relationship between the terminal and the AP is then obtained according to a spatial triangle calculation method, and the final accurate position information of the terminal is obtained by the AP according to the position information of the AP and the accurate spatial position relationship between the terminal and the AP.The multi-PD positioning method and system based on the LiFi technology are simple, economical and good in real-time performance, meanwhile, the interval between the downlink signal and the uplink signal is fully utilized, the LiFi protocol is not affected at all, high-speed communication is guaranteed, and the positioning function is achieved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a multi-PD positioning method and system based on LiFi technology. Background technique [0002] The growing trend of implementing location-based services and applications (such as indoor navigation or opportunity marketing) requires more accurate indoor positioning systems (IPS). Currently, common indoor positioning technologies include wireless fidelity (WiFi), Bluetooth, Radio Frequency (RF), Ultra Wide Band (UWB), Infrared and Visible Light Communication (VLC), etc. [0003] Among them, VLC has high positioning accuracy (PA) and energy efficiency, low positioning cost, and also has the ability to resist traditional radio frequency signal interference, and has become a research hotspot in indoor positioning technology in recent years. Visible light wireless communication (LiFi) positioning mainly has two methods: direct positioning and two-step positioning: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/16H04B10/116
CPCG01S5/16H04B10/116
Inventor 金学广李树白管伟国蒋伟
Owner 苏州碧林威智能科技有限公司
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