U. S. Army soldiers from the 27th Infantry Regiment pull a bobcat tractor out of the mud at their mountaintop position at Observation Post Mustang in Kunar Province, Afghanistan.
在阿富汗库纳尔省的野马观测站，美国陆军第27步兵团的士兵正在山顶将轻型拖拉机从淤泥中拖出来。
During 1981-1987, the fixed position observation was conducted in different patterns of multiple cropping system of paddy fields.
1981年至1987年，对稻田不同多熟种植方式进行了定位观察。
Passive bearings-only target motion analysis (BO-TMA) is to estimate the position and velocity of a target from bearing measurements with corrupted noise obtained by an observation platform.
被动式纯方位目标运动分析(BO - TMA)是一种从探测器所观测到的加噪方位信息中估计目标运动要素的方法。
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