基于时间反转扩频的隐蔽水声通信方法

Covert underwater acoustic communication method based on time reversal spread spectrum

针对低信噪比条件下水下小尺度平台与通信浮标间进行隐蔽水声通信时,强多径干扰导致通信困难的问题,提出了一种基于时间反转技术的直接序列扩频隐蔽通信方法。该方法利用多通道主/被动时间反转的空时聚焦效应,提高了低信噪比条件下直接序列扩频通信的抗多径干扰能力,并且具有良好的低检测概率通信能力。仿真和水池实验结果表明:该方法满足水下小尺度平台处理结构简单、低功耗的要求,实现了水下单阵元平台与通信浮标之间的双向隐蔽通信。

For the low SNR under the condition of small scale platform and communication buoy between hidden underwater communication, strong multipath interference leads to the problem of communication, this paper presents a direct sequence spread spectrum time reversal technique of covert communication method based on. The focusing effect of using multichannel active/passive time reversal space, improves the ability of anti multipath interference under the condition of direct sequence spread spectrum communication and low SNR, and has low detection probability and good communication ability. Simulation and water tank experiment results show that this method meets the requirements of underwater small-scale platform processing with simple structure and low power consumption, and realizes bidirectional covert communication between water single array platform and communication buoy.