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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 of ballistic missile guidance is based on the standard ballistic trajectory correction of the earth oblateness and reentry resistance based on the standard trajectory. The relative standard trajectory has an error of about 100 meters, and the actual trajectory error will be greater. Aiming at this problem, a method of ballistic iterative determination of virtual target point is proposed. The standard ballistic iteration is used before the projectile. The relative standard trajectory of the determined virtual target point is accurate and can be used in the design of closed-loop guided flight segment. In the process of flight, a fast calculation method of free flight trajectory is adopted to calculate the virtual target point in real time and to ensure the accuracy of the virtual target point relative to the actual trajectory. The simulation example verifies the effectiveness and accuracy of the method for ballistic iterative determination of virtual target points and analyzes the feasibility of iterative real-time computation on virtual target point shells.