蛙人协作中的水下无线光通信邻居发现方法

Neighbor Discovery Method for Frogmen Cooperation in Underwater Wireless Optical Communication

针对蛙人在水下协作执行任务时保持良好通信的需求,研究采用无线光通信技术的节点邻居发现方法。由于光束具有方向性,为了保证邻居发现效果,基于无线光水下传播特性设计半球形通信节点结构,通过成对使用的方式完成对蛙人周围三维空间的覆盖。在半球形节点结构基础上研究采用握手交互信息帧的邻居发现协议,通过发光二极管(LED)逐向扫描发送交互信息的方式,可以不依靠外部定位信息发现相邻蛙人节点。针对蛙人在运动状态下通信链路容易发生中断的问题,研究通信链路的跟踪保持方法。仿真结果表明,在合理选择节点结构参数的情况下,邻居发现方法能有效发现邻居节点,建立通信链路,跟踪保持方法也能显著降低通信链路的中断次数。

In order to meet the needs of keeping communication with frogmen in the execution of a task of underwater cooperation, we study a node neighbor discovery method using the wireless optical communication technology. Because the light beam is directional, we design a hemispherical communication node structure based on propagation characteristics of underwater wireless optical communication to guarantee the effect of neighbor discovery. The three dimensional space around the frogmen can be covered with the node structure in pairs. We study a neighbor discovery protocol using the information frames of handshake interaction on the basis of the hemispherical node structure. We find the adjacent nodes of frogmen without external location information through scanning and sending handshake interaction information with the light emitting diodes(LED). Aiming at the problem that the communication link of the frogmen is prone to interrupt in the moving state, we research a track-and-hold method of the communication link. The simulation results show that the neighbor discovery method can effectively discover the neighbor nodes to establish the communication link based on the reasonable selection of the node structure parameters, and the track-and-hold method can also significantly reduce the number of communication link interrupt.