The design of servo system for pitch attitudes of a mine hunting sonar array was made using frequency domain control and variable structure control respectively.

本文对猎雷艇声纳基阵俯仰角姿态伺服系统分别进行了领域法控制律的设计和变结构控制律的设计。

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Such damage has long been suspected, since whales employ their own form of sonar for navigating and hunting, and also use sonar-like low frequency sound for communicating with each other (so-called whale song).

ECONOMIST: Quiet, please. Whales navigating