上个月，在土星轨道上的宇宙飞船卡西尼号拍的这张照片，捕捉到土星著名的卫星中的两个，呈凸圆相位。
A view with two of the more famous moons of Saturn in gibbous phase was captured last month by the robot spacecraft Cassini now orbiting Saturn.
在传统的星载sar问题的研究中，地球采用球模型，轨道采用圆轨道模型，这给星载sar问题的计算带来了一定的误差。
In the traditional solution to the SAR problems, the earth often adopts circular model and the orbit adopts elliptical model. This often brings error to the calculations.
本文研究了在共面圆轨道HEO-LEO的过程中，气动辅助轨道转移飞行器（AOTV）在大气内飞行的极小时间控制问题。
This paper considers the minimum-time control of aeroassisted orbital transfer vehicle (AOTV) which arises in the study of coplanar HEO-LEO orbital transfer.
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