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Internet of Things access control system based on retro-reflection visible light communication

A technology of visible light communication and access control system, applied in the field of Internet of Things access control system, can solve problems such as poor mobility, easy interception, and doubtful security

Active Publication Date: 2020-12-01
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy consumption of LED-based communication transmission is usually hundreds of milliwatts, and the effective power that can be converted by a solar cell of the size of an IoT device is only a few hundred microwatts, resulting in poor mobility and high cost.
Secondly, this active transmission-reception visible light mode is not only easily interfered by the surrounding ambient light, has poor anti-interference ability, but also is easy to be intercepted, and its safety is questionable.
Finally, in order to improve the security of the access control system based on visible light communication disclosed in the above documents, not only the mobile terminal and the access control terminal need to connect with the corresponding server or background management system through the Internet, but also the verification procedure is complicated and complicated, requiring the mobile terminal, the access control terminal and the server Two-way communication with each other multiple times to complete identity verification

Method used

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  • Internet of Things access control system based on retro-reflection visible light communication
  • Internet of Things access control system based on retro-reflection visible light communication
  • Internet of Things access control system based on retro-reflection visible light communication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment discloses an access control system, which can be an Internet of Things access control system, an access control system based on visible light communication, or an Internet of Things access control system based on visible light communication. The system can be controlled by the present invention. system and / or other alternative components. For example, the method disclosed in this embodiment is implemented by using various components in the system of the present invention. In the case of no conflict or contradiction, the whole and / or part of the content of the preferred implementations of other embodiments may serve as supplements to this embodiment.

[0045] Preferably, the existing access control technology based on visible light communication requires the user to connect to the network on the mobile terminal to obtain the corresponding activation code, and use the LED flash to send out the activation code. The access control system using this visible l...

Embodiment approach

[0052] Preferably, the mobile terminal 1 or the access control terminal 2 provided with the retroreflection unit 4 do not need to interact with the server 3. The preferred implementation mode is as follows:

[0053] According to a preferred embodiment, in the case where the mobile terminal 1 is provided with a read-write unit 5, the retro-reflective unit 4 is arranged at the access control terminal 2, such as figure 1 shown. Preferably, the mobile terminal 1 is configured to connect to the server 3 to obtain corresponding identity verification information, and actively send the identity verification information to the access control terminal 2 in the form of optical signals. Preferably, as figure 1As shown, the access control terminal 2 is configured to receive an optical signal through a retroreflection unit 4 . The access control terminal 2 verifies the identity verification information carried by the optical signal based on pre-stored information to generate feedback info...

Embodiment 2

[0061] This embodiment is a further improvement on Embodiment 1, and repeated content will not be repeated here. Preferably, the retroreflective unit 4 has a structure such as Figure 5 As shown, different from the structure of the retroreflective unit 4 in Embodiment 1, the second polarizer 412 is not located between the two first polarizers 411, but is only arranged between the second polarizer 412 and the retroreflective layer 44 at least one first polarizing device. Through this setting method, the visible light communication between the mobile terminal 1 and the access control terminal 2 is flicker-free.

[0062] Preferably, the retroreflection unit 4 is provided with at least one first polarizer 411 that polarizes only when light enters. Preferably, the first polarizing device 411 may be a polarizing filter, a polarizing filter, or the like. Through this arrangement, the optical signal received by the retro-reflective unit 4 is a polarized optical signal, which facili...

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PUM

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Abstract

The invention relates to an Internet of Things access control system based on retro-reflection visible light communication. The system at least comprises a mobile terminal and an access control terminal; the mobile terminal or the access control terminal is provided with a configurable retro-reflection unit; the mobile terminal and / or the access control terminal passively receives an optical signal through the retro-reflection unit and returns the optical signal in a retro-reflection mode so as to be in a passive communication state; and the optical signal can provide energy for the mobile terminal and / or the access control terminal. Through the above mode, one end needing to be configured can be always in passive work without power supply or independently establishing a communication link, the configurability for a specific object can be realized. The system is particularly suitable for an authority management scene that one party is inconvenient to obtain power supply and needs to obtain independent configuration.

Description

technical field [0001] The present invention relates to applications in the field of visible light communication, for example, applying visible light communication to an access control system of the Internet of Things. Background technique [0002] The access control system is in the field of intelligent buildings, meaning Access Control System, which refers to the prohibition authority of the "door", and is the guard against the "door". The "door" here refers to various passages that can pass through, including doors for people to pass through, doors for vehicles to pass through, and doors for storing items. Mainly realize the authority management of entrance and exit access control. With the rapid development of communication, computer and Internet technology, modern access control technology integrates microcomputer automatic identification technology and modern security management measures, involving many new technologies such as electronics, machinery, optics, computer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07C9/22G07C9/27H04W4/70H04W4/80H04B10/116
CPCG07C9/22G07C9/27H04B10/116H04W4/70H04W4/80
Inventor 许辰人徐燮阳
Owner PEKING UNIV