一种虚拟目标点的弹道迭代确定方法

Ballistic iteration calculating method of virtual target point

弹道导弹闭路制导虚拟目标点的传统确定方法是射前基于标准弹道对地球扁率和再入阻力影响分别进行修正,其相对标准弹道存在百米左右的误差,相对实际弹道误差会更大。针对此问题提出了一种虚拟目标点的弹道迭代确定方法,在射前采用标准弹道进行迭代,确定的虚拟目标点相对标准弹道是精确的,且可用于闭路制导飞行段设计。在飞行过程中,采用自由飞行弹道的快速计算方法,实时迭代计算虚拟目标点,保证虚拟目标点相对实际弹道的精度。仿真算例验证了虚拟目标点弹道迭代确定方法的有效性和精度,并分析了虚拟目标点弹上迭代实时计算的可行性。

The traditional method for making certain of the virtual target point in the close-loop guidance meth- od is to revise the earth oblateness and reentry aerodynamic resistance influence respectively base on the standard trajectory, but the revised error of 100 m about to relative to the standard trajectory is in existence, the error is more to relative to the practical trajectory. In the paper a ballistic iteration calculating method of the virtual target point was put forward. Before shooting, the virtual target point to make certain by using the iteration of the standard trajectory was accurate to relative to the standard trajectory, and the flight segment of the close-loop guidance was also designed by the ballistic iteration ; in the process of the flight, by using the fast calculation method of the free flight trajectory, real-timely and iteratively calculating the virtual target point, the precision of the virtual target point to relative to the practical trajectory could be held. The simulation calculation example proves the validity and precision of the ballistic iteration calculating method of virtual target point, and analyzes the feasibility of the real- time iteration calculation of the virtual target point.