Some key techniques, such as attitude correction, quality control of GPS height, transformation of vertical reference datum and extraction of tidal level, are studied in detail.
这些关键问题主要有姿态改正、GPS高程质量控制、垂直基准转换、基于信号的在航潮位提取。
These can be "dragged out" of rulers, providing a vertical or horizontal line to reference as you place components on the workspace.
可以从标尺“拖出”这些线，作为在工作区上放置组件时的垂直或水平参考线。
The gyro vertical utilizes a gyroscope as an integrating device to obtain the average position of a pendulous gravity reference .
垂直陀螺利用一个陀螺仪作为积分装置以得摇摆不定的重力基准线的平均位置。
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