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Visible light communication method controlled by active reflector of radio astronomy-telescope and device thereof

A technology of astronomical telescope and communication method, applied in electrical components, electromagnetic transmitters, electromagnetic receivers, etc., can solve the problems of radio telescope interference and telescopes not working properly.

Inactive Publication Date: 2016-08-03
NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The use of visible light wireless communication can completely avoid any conflict or overlap with the working frequency band of radio telescopes; while it is difficult to completely avoid the working frequency band of radio telescopes with traditional radio frequency wireless communication, from the submillimeter wave band to the long-wave meter wave, it will cause serious damage to radio telescopes. interference that prevents the telescope from functioning properly

Method used

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  • Visible light communication method controlled by active reflector of radio astronomy-telescope and device thereof
  • Visible light communication method controlled by active reflector of radio astronomy-telescope and device thereof
  • Visible light communication method controlled by active reflector of radio astronomy-telescope and device thereof

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Embodiment 1

[0059] Embodiment 1: see optical channel model model analysis.

[0060] In visible light communication systems, LEDs are usually used as the emission light source. The emitted optical signal propagates through free space to the receiver, which is the photodetector. The receiver not only collects the desired light signal, but also collects stray light that degrades communication performance. Optical filters can be used to reduce the effect of such background noise. Typically, optical concentrators are used to increase the signal gain at the receiving end. Moreover, the visible light communication method is easily affected by obstructions. Therefore, it is necessary to analyze the channel model of the visible light communication system.

Embodiment 2

[0061] Embodiment 2: Visible light wireless communication control design.

[0062] The transmitter mainly conducts detailed research on the selection of LED devices, driving circuits and other parts; the receiver mainly studies the light receiving module based on avalanche photodiodes (APD), including the selection of photodetectors, preamplifiers and main amplifiers. . Research communication techniques in point-to-point channel mode.

Embodiment 3

[0063] Embodiment 3: Distributed system design.

[0064] Research on the principle, real-time and stability of distributed systems; selection of distributed controllers; research on distributed control and connection methods to adapt to the control requirements of radio telescopes. Some difficult problems in distributed design and research must be solved with the help of some algorithms, such as the consistency of distributed environments; research on Paxos algorithm and consistent Hash algorithm.

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Abstract

The invention discloses a visible light communication method controlled by an active reflector of a radio astronomy-telescope and a device thereof. (1)-(4) are emitting ends; (5)-(8) are receiving ends. The method comprises the following steps: (1) a PC machine of a control system emitting end inputting a control signal to a channel encoder which converts the control signal into a digital signal; (2) outputting the digital signal to a digital modulator which converts the digital signal to a modulation signal; (3) outputting the modulation signal through a driving circuit to a visible light source; (4) emitting the modulation signal to a light-sensitive element in signal receiving part; (5) inputting the modulation signal to a conditioning circuit; (6) outputting the conditioned signal to the digital modulator; (7) after modulation, inputting the signal to the channel decoder; (8) inputting the decoded signal to the PC machine of a controlled system; (9) the PC machine of the controlled system inputting the signal to an execution mechanism controlled by the active reflector of the radio astronomy-telescope. According to the invention, the method aims at providing a visible light based wireless communication system for the first time in the world for the active reflector of the radio astronomy-telescope, realizes wireless control of a large-scale actuator and a barrier-free communication and small signal fidelity transmission method thereof.

Description

technical field [0001] The invention relates to a control application, in particular to a visible light communication method controlled by an active reflection surface of a radio astronomical telescope. The invention also relates to the equipment used in this method. This invention is a key support project of the National Joint Fund, "Key Technology Research on the Active Surface of Large Radio Telescope", and the approval number is: U1331204. Background technique [0002] Modern large radio telescopes widely use active reflective surface technology to achieve observation of shorter wavelength bands, that is, to implement active deformation technology on a certain reflective surface of the telescope to compensate for surface shape errors caused by factors such as processing, assembly, gravity, and temperature. , or actively adjust to a certain required face shape. The working principle of the active adjustment system of the main reflector is to restore the main surface of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04L12/863H04B10/50H04B10/60
CPCH04B10/116H04B10/502H04B10/60H04L47/50
Inventor 王佑张勇陆启帅
Owner NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE