The result is satisfactory by using a method of the artificial earth satellite orbit determination from range rate observations to fit the free-flighttrajectory of rocket.
用人造地球卫星轨道计算的测速定轨方法，去拟合火箭飞行弹道的自由段，取得了比较满意的结果。
2
By using the line of sight (LOS) measurements from space based infrared sensors, freeflight phase trajectory estimation problem of ballistic missile is studied.
主要研究空间预警系统利用星载红外传感器的视线测量估计弹道导弹自由飞行段弹道的问题。
3
The trajectory model consists of the uncontrolled freeflight segment, the inertial guided glided segment and the final guidance segment, which accords with the proportional guided law.