Intelligent traffic system based on visible light communication

An intelligent transportation system and visible light technology, applied in the field of intelligent transportation systems based on visible light communication, can solve the problems of wireless Wi-Fi technology security risks, low feasibility, high network access costs, etc.

Inactive Publication Date: 2015-11-11
CHENGDU HONGYI TIANCHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above prior art, the purpose of the present invention is to provide an intelligent transportation system based on visible light communication, which aims to provide high-speed network access, meet market demand, and solve the problem of expensive network access in the existing transportation system, wireless Wi-Fi technology There are safety hazards of crosstalk control passband and low feasibility

Method used

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  • Intelligent traffic system based on visible light communication
  • Intelligent traffic system based on visible light communication
  • Intelligent traffic system based on visible light communication

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Experimental program
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Effect test

Embodiment 1

[0022] image 3 For signal reception sampling schematic diagram in the present invention, light-emitting diode LED13 sends out data packet, and photodiode 14 is connected FPGA6 and finishes clock synchronization by stepping amplifier 12, guarantees the time accuracy that sampling takes place; The photodiodes 14 have the same cycle, and the delay in sending a single data within one cycle does not exceed 3ms. In the receiving process, the clock of photodiode 14 is ahead of 1 / 4 of the light-emitting period of LED13. When LED13 emits logic "0" (low light density), photodiode 14 starts to sample 1; when LED13 sends logic "1" (high light density), Photodiode 14 starts sampling 2, and FPGA 6 compares the two samples.

Embodiment 2

[0024] image 3 In the curve of photodiode PIN.D3, the energy of photodiode PIN.D3 sampling 1 and 2 is equal, and the clock phase of LED13 and photodiode PIN.D3 exceeds two sampling periods. Optical density is too low. Therefore, the communication algorithm should include ensuring that at least one of the two sampled signals is detected as a logic "1". For example, if the sampling signals 1 and 2 do not exceed the determined threshold, FPGA6 recognizes that the clock is off for 2 cycles, and adjusts the clock; if after adjustment, the sampling signals 1 and 2 still do not exceed the threshold, it is determined that there is currently no light source input synchronization signal mode.

Embodiment 3

[0026] The optional wavelength range of LED13 lamps is 850nm, 1310nm, 1490nm, CW-DM, 1550nm, DWDM; the activation method is light sensor start, passive light start, light and sound control combination technology, light sensor mechanical integration module and / or optional technology choose.

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PUM

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Abstract

An intelligent traffic system based on visible light communication is disclosed. The invention relates to an intelligent traffic system and aims to provides high network access, satisfies the market demands, and solve the problem that a conventional traffic system is highly expensive in network access, wireless Wi-Fi technique has safety risk on crosstalk control passband and is low in feasibility. The intelligent traffic system comprises a Wi-Fi base station which comprises fiber links, establishes connection between an accessing terminal and an Internet terminal, processes electric signals, and receives and / or sends electric signals; a street lamp which comprises a photoelectric communication apparatus, receives the electric signals of the Wi-Fi base station, converts the electric signals into optical signals and sends the optical signals; and an automobile which comprises a photoelectric communication apparatus, receives the optical signals of the street lamp and / or sends optical signals to the street lamp. The intelligent traffic system is applicable to high speed network access on roads.

Description

technical field [0001] The invention relates to an intelligent transportation system, in particular to an intelligent transportation system based on visible light communication. Background technique [0002] In the existing transportation system, passengers have a strong demand for Internet access during the sleepy journey. In the existing technology, generally, passengers use LTE technology to access the Internet, 2G access speed is low, and 3G / 4G traffic charges are too expensive; secondly, most of the mobile Wi-Fi sharing networks of public transportation belong to local area networks, and access is limited. And it has an impact on public transportation and communication, and there are potential safety hazards; finally, the civilian use of satellite communication technology is not perfect, and its feasibility is questionable. To sum up, in the existing transportation system, the networking of intelligent transportation cannot be well realized, passengers cannot obtain hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/25H04L29/08
Inventor 周伦
Owner CHENGDU HONGYI TIANCHENG TECH
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