THAAD增程型拦截弹预测制导方法

根据公开资料对THAAD增程型拦截弹建模，针对大射程的特点规划了高抛弹道，生成标准弹道族。提出了迭代预测命中点法，利用解析方法计算剩余飞行时间，基于多项式拟合法寻找标准弹道，确定预测命中点，完成预测制导任务。将迭代预测命中点法与迭代飞行时间法进行对比，迭代预测命中点法初值选取容易，程序运行时间减少20%，制导过程中无需调用标准弹道文件，节省了计算机存储空间。通过改变射程、航路捷径对预测制导方法进行仿真验证，结果表明，拦截弹拦截射程可覆盖到600 km，并且能完成存在航路捷径时的拦截任务，平均脱靶量在200 m以内，应对气动不确定性的效果良好。 

Predictive guidance method of THAAD-ER interceptor

Based on public information, the model of THAAD-ER interceptor was established. Aimed at longer range, the high throw trajectory was planned, and a bunch of standard trajectories were produced. Predicted impact point iterated method is proposed, which contains solving time-to-go with analytic solution, seeking out the expected standard trajectory with polynomial fitting, and ascertaining the predictive impact point, and finally predictive guidance completes. Comparison is taken between predicted impact point iterated method and flight time iterated method, and it is easy to choose initial value with predicted impact point iterated method, and the program runtime decreases by 20%; standard trajectory files are not necessary during guidance process, which can save storage space of the computer on the interceptor. Large amount of simulations were carried out with different range and course shortcut, and the results show that interception range of THAAD-ER interceptor can reach 600 km, and the interception task can be completed with average miss distance less than 200 m when course shortcut remains. It has a good response to aerodynamic uncertainty.