中文说明：
弹道方程组的三个阶段仿真程序，通过将其分成三个阶段，分别得到数值解。
一般情况下，弹道仿真中均不考虑弹体的振动特性，即在弹体为刚体这一近似条件下进行仿真建模，此时仿真模型由导弹动力学模型和运动学模型构成。描述导弹动力学模型和运动学模型是非线性的一阶常微分方程组，这样一组方程，通常得不到解析解，只有在一些十分特殊的情况下，通过大量简化，方能求出近似方程的解析解。
English Description：
The three-stage simulation program of ballistic equations is divided into three stages, and the numerical solutions are obtained respectively. In general, the vibration characteristics of missile body are not considered in ballistic simulation, that is to say, the simulation model is built under the approximate condition that the missile body is a rigid body, and the simulation model is composed of Missile Dynamic Model and kinematic model. The dynamic model and kinematic model of missile are nonlinear first-order ordinary differential equations, such a set of equations, usually can not get analytical solution, only in some very special cases, through a large number of simplification, can the analytical solution of approximate equation be obtained.