本文分析了AE D极轨卫星近地点的变化及其相应的大气膨胀和密度分布情况。
In this paper, variations of AE-D's perigee altitudes, the corresponding atmospheric expansion and the density distributions are analyzed.
我们发现，在反射波到达爆炸点后，这里出现了一条密度为零的奇轨线和另一条左向的激波。
We find that there appears a singular trajectory ( density on it being zero ) and a additional left-facing shock after the reflected wave reaches the explosion point.
通过概率密度函灵数及平均相轨线的分析，指出该系统在这两种情况下作所谓的混沌随机运动。
Through the analysis of their probability density function and mean trajectory, it shows that this system in these two cases can occur chaotic stochastic motion.
大气阻力是低轨卫星主要的摄动力，与高层大气密度的变化密切相关。
Atmospheric drag is the main perturbation force on a low earth orbit satellite and is closely related to the variation of high atmospheric density.
在这些模型中并没有一种在任何情况下都是最好的，因此，对于特定轨道选择合适的大气密度模型对提高定轨预报的精度是非常重要的。
Therefore, it is very important to choose an appropriate atmospheric density model for a specific orbit to improve the accuracy of orbit forecast.
本文针对高轨道密度光碟机的寻轨伺服与定轨伺服控制问题，提出一个系统化的设计方法。
This paper presents a systematic method for the design of track seeking and following servo controller of high track density optical disk drive.
本文针对高轨道密度光碟机的寻轨伺服与定轨伺服控制问题，提出一个系统化的设计方法。
This paper presents a systematic method for the design of track seeking and following servo controller of high track density optical disk drive.
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