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当潜艇在水下执行任务时,潜艇与其他舰艇的通信总是一个令人头疼的难题,因为海水的电导率会对电磁波产生天然的屏蔽,而大多数可用于无线通信的波段都极难渗透这种屏蔽。大部分国家的海军依赖长波电台与潜艇保持联系。长波能够穿透的海水深度为10～40米,接近水面航行的潜艇可以接受到长波信号。当潜艇在更深的水下执行任务时,可以通过与电缆相联的天线
The submarine’s communication with other ships is always a daunting problem as the submarine performs its mission underwater because the electrical conductivity of seawater creates a natural shield of electromagnetic waves and most of the bands available for wireless communications are extremely difficult to penetrate This shield. Navy in most countries rely on longwave radio to keep in touch with submarines. Long waves can penetrate the depth of 10 to 40 meters of water, submarines close to the surface of the water can receive long-wave signals. As the submarine performs its mission under deeper water, it can pass through the antenna associated with the cable