点对点移动水声通信技术研究

Study on point-to-point mobile underwater acoustic communication

点对点移动水声通信是实现由活动和静止节点共同构成的水声数据通信网的关键技术之一.对移动水声通信声信道特性进行了分析,指出不同途径到达的声线对应的多普勒频偏不一致,进一步加大了多途扩展产生的码间干扰的复杂性,不利于水声通信.提出单阵元被动式相位共轭镜信道均衡技术,可实时自动补偿多普勒频偏,并聚焦多途信号.将单阵元被动式相位共轭应用于Pattern时延差编码移动水声通信系统,进行了移动水声通信试验,湖试结果验证了其消除码间干扰性能及本文水声通信系统的鲁棒性.

Point-to-point mobile underwater acoustic （UWA） communication is one of the key technologies for UWA networks which consists of mobile and stationary nodes. The mobile communication UWA channels are analyzed, whose eigen rays have different Doppler shifts which enhances the complexity of intersymbol interference （ISI） caused by the muhipath channel, that goes against the UWA communication. The channel equalization using single sensor passive phase conjugation minor （PPCM） is proposed to compensate for the Doppler shift in real time and to focus the muhipath signals. The application of single sensor PPC to communication system based on Pattern time delay shift coding scheme is carried out in lake trials. The results of lake trials validated the capability of PPCM mitigating ISI and the robustness of the communication system.