Video monitoring system of mine working face based on wireless multi -hop network
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摘要: 针对井下有线传输方式线缆部署难度大、线缆极易受到损坏及传统无线局域网通信距离较短、无法适应煤矿井下工作面狭长环境等问题，设计了基于无线多跳网络的矿井工作面视频监控系统。该系统由视频采集节点、无线多跳网络（含网关节点、传输节点及网络交换机）、客户端等组成。视频采集节点完成视频信息采集、编码和封装，并通过推流软件MJPG -streamer将采集到的视频以数据流形式发送出去；无线多跳网络通过最优链路状态路由（OLSR）协议进行自组网，实现采集节点与网关节点的连接；客户端接收来自各路监控的视频流，实现多路视频实时显示、远程监控、保存及回放功能。实测结果表明，经过3跳传输后，系统吞吐量为10.1 Mbit/s，丢包率为2.2%，平均时延抖动和系统端到端传输时延等指标优于基于传统无线局域网的视频传输系统。实际应用结果表明，当工作面中各节点之间距离在70 m以内时，系统运行效果较好；基于无线多跳网络的视频监控系统与基于有线传输的视频监控系统采集到的画面质量基本一致。Abstract: In view of problems that underground wired transmission mode has difficulty in cable deployment and cables are extremely vulnerable, traditional wireless local area network has short communication distance and cannot adapt to the long and narrow environment of coal mine underground working face, a video monitoring system of mine working face based on wireless multi -hop network was designed.The system consists of video acquisition node,wireless multi -hop network (including gateway nodes, transmission nodes and network switches) and clients. The video acquisition node completes video information collection, encoding and packaging, and sends the collected video as data stream through the push streaming software MJPG -streamer; the wireless multi -hop network adopts optimal link state routing (OLSR) protocol for ad -hoc networking, so as to realize the connection between collection node and gateway node; the clients receive the video streams from various monitoring channels, and realize the functions of multi -channel video real -time display, remote monitoring, storage and playback. The actual test results show that after 3 -hop transmission, the system throughput is 10.1 Mbit/s, the packet loss rate is 2.2%, and the average delay jitter and system end -to -end transmission delay are better than traditional wireless LAN -based video transmission systems. Practical application results show that when the distance between nodes in the working face is within 70 m, the system operates well; the video monitoring system based on wireless multi -hop network and the video monitoring system based on wired transmission basically have the same image quality.
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期刊类型引用(7)
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