An orbital modulation method by controlling the corresponding transient orbit errors of mean orbit control targets was proposed.

提出了一种通过控制平均轨道控制目标对应的瞬时轨道偏差量进行轨道修正的方法。

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On the basis of mean orbit concept, a fast algorithm for the prediction of LEO satellite passes and image opportunity is presented.

在引入平均轨道概念的基础上，提出了一种针对低轨道卫星的过顶与成像区域时间的快速预报算法。

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Reed warns that if space junk is not removed it could mean that low-earth orbit might eventually become unusable.

CNN: Space harpoon plan to nail orbital garbage

It could mean they gain control of the spacecraft systems and can fire the engines, but after the orbit around Earth has dropped so low that there is not enough fuel to go to Phobos.

MSN: Salvaging Science from Stricken Mars Moon Probe: A Scientist's View - Technology & science - Space - Space.com | NBC News