球面上共焦点之椭圆、双曲线，在球心投影中仍投影成共焦椭圆、双曲线。
The cofocal ellipse and hyperbola of spherical surface will also be projected into the cofocal ellipse and hyperbola in gnomonic projection.
在共焦椭圆情况下，当频率较低时，本文结果与准TEM波分析结果趋于一致。
The results of this method are in agreement with those calculated in quasi-TEM case in low frequency for confocal ellipses.
讨论了平面情况时两个共焦的椭圆轨道之间的最佳单冲击过渡及其意义。
This paper studies the best one impulse transfer between two coplanar and confocal elliptic trajectories and its application.
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