With analyzing the detecting procedure of Low-frequency active sonar and emulating about it, the Optimum Detection frequency Band of Low-frequency active sonar were researched.

本文通过对低频主动声纳的主动声纳方程的分析与声学探测过程的仿真，初步研究了低频主动声纳在不同距离上的最优探测频率问题。

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Thus research has been going on for some time in the area of low frequency active (LFA) towed array sonar.

如此研究一直在低频率活跃的 （LFA） 被拖的排列声纳的区域中继续有一些时间之久。

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The U. S. Navy plans to deploy a new submarine detection system, known as Low Frequency Active Sonar (LFA), throughout 80% of the world's oceans.

在世界的 80% 的大海各处， 美国海军计划部署一个新的海中发现系统， 即是低的频率活跃的声纳 （LFA） 。

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The Navy disputes his assessment, saying this year's humpback whale season was normal, and more whales than ever before were seen in March 1998, when biologists studied humpbacks' response to the Navy's Low-Frequency Active Sonar (LFAS) equipment in Hawaiian waters.

CNN: waves