在许多情况下，失败是难能可贵的事，甚至是在另外方面成功的先决条件。
In many circumstances, failure is an asset, even a prerequisite to success in another direction.
本文推导了星载测定外方位元素参与下，无地面控制点卫星摄影测量高程误差估算公式。
This paper deduces elevation error estimating formulae of the satellite photogrammetry, which is concerned with elements of exterior orientation that measured by spaceborne sensors.
提出在现有条件下利用激光实现无源红外方位标的思路，并通过详细计算与分析，论述了无源红外方位标的可行性。
This paper points out how to found a passive drone of infrared under the present conditions and discusses the feasibility of the drone with careful calculation and analysis.
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