摘要
军事、抢险救灾、野外作业等无基础设施支持的应急场合,需要一个稳定有效的通信系统。文中结合Ad Hoc组网,嵌入式系统,QT多媒体开发等技术,设计完成了一种分布式和支持实时语音视频的应急通信验证系统。根据仿真结果选择优化链路状态路由协议,同时采用RTP实时流媒体传输技术,Speex、Ffmpeg的音频视频编解码方案,有效地控制了语音传输中的噪声、回声和抖动,确保了实时语音和视频的低传输时延和高稳定性,支持可变码率的音视频传输。测试表明,该系统具备多跳中继、快速自主组网能力,并支持组播和广播通信,且短消息、语音、视频通信流畅稳定。
In some special fields such as military, patrol, rescue and relief, fieldwork and other emergency situations without infrastructure support, a stable and effective communication system is needed. An emergency corn- munication system supporting real-time voice and video is designed and completed based on the Ad Hoc network, embedded system, and QT multimedia development. The optimized link state routing protocol is selected with the use of RTP, Speex and Ffmpeg to control the noise, echo and jitter of voice transmission effectively and to ensure low delay video and audio transmission with variable bit rate support. Tests show that the system is capable of fast building with support for multi-hop, broadcast and muhicast and with fluent and stable message, voice and video communication.
出处
《电子科技》
2015年第10期49-52,60,共5页
Electronic Science and Technology
基金
国家自然科学基金资助项目(61202490)
航空科学基金资助项目(2013ZC15008)
