介绍潜艇潜望镜瞄准棱镜俯仰的闭环控制与开环控制的组成及其工作原理。
The paper introduces the configuration of system and the work principle of the closed and opened loop control in the pitching of collimation prism of the submarine periscope.
当潜艇指挥官使用潜望镜对海面态势进行评估的时候最容易被探测到也最容易被攻击。
Submarines are most vulnerable to detection when the submarine commander USES a periscope to assess the situation on the surface.
当时天色昏暗，难以用潜望镜观察，而潜艇的听音设备也坏了。
The failing light was such that observation by periscope could not be relied on, and the Upholder's listening gear was out of order.
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