针对全捷联图像导引头无法直接得到惯性系下的视线角速率问题，提出了基于扩展卡尔曼滤波的制导信息估计算法。首先推导了理想条件下视线角速率的解耦公式。进而基于扩展卡尔曼滤波方程，建立了全捷联体制下的制导信息估计模型，结合单兵便携式制导弹药的作战使用模式，通过蒙特卡洛打靶进行了精度仿真分析。最后通过半实物仿真实验对制导系统的闭环可行性进行了验证。结果表明，通过该算法估计得到的制导信息可以满足全捷联制导弹药命中精度的要求，全捷联图像导引头结合制导信息估计算法的技术途径具有较高的工程价值。

Due to the strapdown image seeker cannot measure the inertial line-of-sight (LOS) rate directly, an arithmetic for estimating the LOS rate based on extended Kalman filter(EKF) was presented. The LOS rate decoupling expression under ideal condition was deduced. The model for estimating available guidance information based on EKF equations was established. Then according to the features of operational use of the man-portable guided munitions, the hit probability was analyzed by Monte Carlo method, the Circular Error Probable(CEP) met the operational requirements. The engineering feasibility of guidance system is verified by hardware-in-the-loop simulation. The results show that the arithmetic is an effective solution for estimating available guidance information for strapdown image guided man portable munitions. The technical approach of strapdown image seeker with estimation arithmetic of guidance information is suitable for engineering application.