矿井WiFi视频传输系统软硬件设计与实现

摘要

针对矿井光线强度不够、瓦斯防爆、坑道弯曲多变等引起的多媒体信号获取困难与传输环境恶劣等问题，研制了高效的 WiFi视频传输系统，并应用于矿井通信场合.采用嵌入式 ARM处理器、红外 CCD摄像头、WiFi 模块等器件构造基本硬件传输处理平台，在软件上采用 H.264视频编解码、RTP/UDP 封装、WiFi 快速切换等信息获取与传输机制，最终研制了满足煤矿多媒体监管所需的高效、低功耗井下无线多媒体终端系统.经工程实践验证，该系统适应井下弱光甚至全暗、防爆、低功耗、复杂链路等工作环境，并取得了较好的井下 WiFi 视频传输效果.因此，所设计的矿井 WiFi传输系统能有效消除井下恶劣信道环境的影响，实现低成本实时宽带视频信息传输，可在矿井安全监控管理等场合广泛应用.%According to the difficult problems of multimedia signal acquisition and the poor channel transmission circumstances due to the facts such as the insufficient lightness,the gas explosion proof and the zigzag mine tunnels,and so on,a new efficient wireless fidelity (WiFi)video trans-mission system was developed and used on the underground mine communication occasions.In the aspect of hardware for the proposed system,it mainly exploited the devices of embedded ARM processor,infrared charge-coupled device (CCD)camera,WiFi module,and so on.In the aspect of software for the proposed system,it used H.264 video codec,real time control protocol (RTP)/user datagram protocol (UDP)encapsulation,quick WiFi handover and some other infor-mation acquisition and transmission mechanism.Finally,an efficient and low power consuming underground mine wireless multimedia communication prototype was developed to meet the re-quirement of under ground mine multimedia supervision.Through practical testing and verifica-tion,the proposed scheme was found to be suitable for the poor working conditions such as weak lightness,explosion proof,complex transmission link,and so on.Thus it obtains efficient and reliable under-mine WiFi video transmission effect.Therefore,the designed underground mine WiFi transmission system can overcome the terrible circumstances of the transmission channel and realize the low cost real time broadband video information transmission.And it can be widely used on the occasions of the underground mine security surveillance and management.