在理想弹道计算的基础上选取特征点，在每个特征点，将对象简化为一个二阶环节来近似。
Based on ideal trajectory calculation, characteristic points are chosen. On each point, plant is simplified as a second order one.
我们想卖给会员能挥出他们理想弹道的球杆，做到这一点并不容易，除非你能充分了解产品。
We try to sell them a club that gives them the ball flight they are looking for, which is difficult to do unless you are educated on what you are selling.
根据飞行器椭圆弹道的性质、飞行器再入条件、球面几何和不动点原理给出了理想弹道的计算算法。
Baced on the properties of elliptical trajectory, the reentry conditions of the vehicles, spherical geometry, and the fixed-point theorem, an algorithm for the ideal trajectory is proposed.
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