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。
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.
“无瑕号”由平民操作，装备有主动探测的低频声纳，具备一系列的模块，每一模块配有两个大马力的传感器。
Crewed by civilians, Impeccable is equipped with an active low-frequency towed array with a series of modules, each housing two high-powered transducers.
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