基于光纤无线融合的传感系统

发布时间：2018-01-29 00:14

本文关键词： 光纤无线融合光纤传感 ROF B/S架构　出处：《山东大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着物联网技术发展及中国"物联网创新2.0模式"、"两网融合"的提出,智能化业务爆炸性增长,伴随而来的海量信息对现有通信传输网络产生巨大挑战。同时,高清多媒体、交互式网络应用、远程监控网络的普及,带来全球网络流量的指数型增长,也使得接入网络和光传输网络面临严峻的考验。众所周知,光纤传输网络得益于其传输速率高、可靠性高、可维护性高得到广泛应用。但是有线光网络的灵活性差,限制了光网络的分布式部署。ROF(光载无线电),在中心局端将无线射频(RF)信号调制到激光上,然后经光网络传输到远端天线单元。光载毫米波传到远端天线单元后,光电探测设备接收并将微波信号解调出来,微波信号经过天线发射即可传输用户信息。由于光纤只充当传输介质,对信号的处理再生、交换控制等复杂功能都设置在中心站,非常便于集中控制、设备维护;基站只保留光电转换和功放功能,设备简单,便于灵活部署,提高了通信覆盖率。但是目前的光载无线通信面临无线频谱匮乏,传输带宽有限的问题,亟待下一代光载无线系统解决最后一公里甚至最后100米的问题。那么,在此基础上研究和设计一个融合多种传感数据的大带宽、高安全性、高稳定性的光纤无线融合传感系统是十分必要的。本文基于ROF技术、PON网络技术、多模光纤、可扩展多种传感器的ZigBee节点、光纤布拉格光栅(FBG)传感器以及相应的调制解调技术,设计实现基于动态可重构R0F-PON架构的光纤无线融合传感系统。ZigBee终端节点的传感器采集信息后以无线方式发送到协调节点天线端,天线端将信号上传至ONU,然后以光信号形式发送到ODN。FBG传感器中心反射波长在靠近用户端进行解调并将信号上传至ONU,ONU将光信息送入ODN与承载ZigBee传感信息的光载RF信号复用进入单根光纤进行传输,直至OLT端。在OLT和ODN之间采用多模光纤,光纤链路中的斯托克斯(Stokes)、反斯托克斯光(Anti-Stokes)两种背向散射光反射回OLT端。拉曼(Raman)系统的波长解调模块以及ZigBee的协调节点都位于OLT端,光载波经过解调和处理后,把传感数据存入数据库服务器。Web服务器上连数据库(Database)服务器,通过调用Database将数据发布到web页面,以便客户通过互联网访问Web服务器来浏览传感数据。本文主要在以下三个方面做了相关研究工作:首先,简单介绍基于ZigBee系统的无线传感原理、FBG系统传感原理、分布式光纤拉曼(Raman)系统传感原理、波长解调原理。然后,对基于PON和ROF网络以及数据库(SQL)服务器和B/S架构的多业务传感系统给出了设计方案。将无线传感数据、光纤传感数据汇入ROF-PON传感网络,经过解调处理后把传感数据存入数据库,基于B/S架构将传感数据呈现在web端,供用户查看。最后,提出一种动态可重构ROF系统,实现光载波在全光域的多倍频和调制格式的转换。
[Abstract]:With the development of the Internet of things technology and the "innovation 2.0 mode of the Internet of things" in China, and the "convergence of two networks", intelligent business explosive growth. At the same time, the popularization of high-definition multimedia, interactive network application and remote monitoring network brings the exponential growth of global network traffic. Access network and optical transmission network are also facing a severe test. As we all know, optical fiber transmission network benefits from its high transmission rate and high reliability. High maintainability is widely used, but the flexibility of cable optical network is poor, which limits the distributed deployment of optical network. ROF (Optical Radio). The radio frequency RF (RF) signal is modulated to the laser at the center end, and then transmitted to the remote antenna unit via the optical network, and the millimeter wave is transmitted to the remote antenna unit. The photoelectric detection equipment receives and demodulates the microwave signal, and the microwave signal can transmit the user information through the antenna. Because the optical fiber only acts as the transmission medium, the signal is processed and regenerated. Exchange control and other complex functions are set in the central station, very convenient for centralized control, equipment maintenance; The base station only retains the function of photoelectric conversion and power amplifier, the equipment is simple, the flexible deployment is convenient, and the communication coverage is improved. However, the current optical wireless communication faces the problem of lack of wireless spectrum and limited transmission bandwidth. It is urgent to solve the problem of the last kilometer or even the last 100m in the next generation optical wireless system. On this basis, we study and design a large bandwidth and high security which can integrate many kinds of sensor data. High stability optical fiber wireless fusion sensor system is very necessary. This paper based on ROF technology, multi-mode fiber optic fiber, can expand a variety of sensor ZigBee nodes. Fiber Bragg grating (FBG) sensor and the corresponding modulation and demodulation technology. The design and implementation of fiber optic wireless fusion sensor system based on dynamic reconfigurable R0F-PON architecture. ZigBee terminal node sensor acquisition information is sent to the coordinated node antenna in a wireless manner. The antenna uploads the signal to the ODN.FBG, then sends the signal to the ODN.FBG sensor center in the form of an optical signal, demodulates the reflection wavelength near the client and uploads the signal to the ONU. ONU sends optical information into ODN and optically loaded RF signals carrying ZigBee sensing information into a single optical fiber for transmission until the OLT end. A multimode optical fiber is used between OLT and ODN. Stokes Stokes in Fiber links. Anti-Stokes Light (Anti-Stokes) two kinds of backscattered Light reflected back to the OLT end. Raman Raman). The wavelength demodulation module of the system and the coordination node of ZigBee are all located in the OLT terminal. After demodulation and processing, the sensing data is stored on the database server. Web server with database database server. Publish the data to the web page by calling Database. In order for customers to access the Web server through the Internet to browse sensor data. This paper mainly in the following three aspects of research work: first of all, a brief introduction of the principle of wireless sensor based on ZigBee system. FBG system sensing principle, distributed fiber Raman raman system sensing principle, wavelength demodulation principle. Then. The design scheme of multi-service sensing system based on PON and ROF network and database SQL) server and B / S architecture is given. The optical fiber sensor data is imported into ROF-PON sensor network, after demodulation processing, the sensing data is stored in the database. Based on the B / S architecture, the sensing data is presented in the web terminal for users to view. Finally. In this paper, a dynamic reconfigurable ROF system is proposed to realize the conversion of optical carrier multi-frequency doubling and modulation format.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212;TN929.1;TN92

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