针对弹道导弹自主探测和机动突防技术中对拦截弹状态估计精度的要求，提出了一种变结构交互式多模型滤波算法(VSIMM)。通过引入拦截弹的多种机动模型并采用依概率准则的方法进行交互计算，使滤波估计结果迅速收敛，同时对拦截弹的机动状态进行检测，合理调整参与交互计算的模型个数，使滤波估计模型与拦截弹的真实机动运动情况相近。仿真结果表明，变结构交互式多模型滤波方法能根据拦截弹的飞行状态自适应地调整滤波估计模型，滤波的精度较高。

According to the requirement of state estimation accuracy of interceptor in autonomous detection and maneuvering penetration of ballistic missile,a Variable Structure Interactive Multiple Models(VSIMM) algorithm was presented.The filter estimation results concentrated rapidly via introducing multiple maneuvering models and adopting probability rule method to calculate interactively.The maneuvering state was examined synchronously and the number of models participated in the interactive calculating was adjusted properly,which would make the filter estimation models be similar to the real maneuvering state of interceptor.The simulation results show that the proposed method can modify filter estimation models adaptively according to the flight status of interceptor and can get high filter precision.