The reason why GPS leveling cant be used for height transfer across obstacle is that the height datum of both sides of obstacle is not consistent.
GPS水准无法直接应用于跨障碍高程传递，其关键原因在于障碍物两侧的高程基准不一致。
The system designed according to the structure of some type of Helmet Mounted Sighting can check and transfer the Helmet Mounted Sight as the datum .
该系统从结构上是针对某型头盔瞄准具进行设计的，可以作为基准对头盔瞄准具进行检查和调校。
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