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一、引 言 随着海洋开发和水下潜艇航行的需要,水下信息的传送已成为日益重要的问题.对于潜艇水下通讯、深海水下摄象及水下电视的长距离无线传输,声波是一种有效的传输工具。通常的线性声学水下声通讯系统存在着指向性与传送距离的矛盾。为了减少多径干扰,必须提高发射器的指向性,亦即提高工作频率,从而就要牺牲作用距离。
I. INTRODUCTION With the development of ocean and the need of underwater submarine navigation, the transmission of underwater information has become an increasingly important issue.For long-distance wireless transmission of submarine underwater communications, deep-sea underwater camera and underwater television, sound waves are An effective transmission tool. The usual linear acoustic underwater acoustic communication system has the contradiction between the directivity and transmission distance. In order to reduce multipath interference, it is necessary to increase the directivity of the transmitter, that is, to raise the operating frequency, so that the operating distance must be sacrificed.