中文摘要：

目标机动是影响制导精度的关键因素之一,针对此问题,提出了一种解决目标加速度估计问题的新思路,即通过扩张状态观测器（extended state observer,ESO）来实时估计目标加速度。首先建立弹目相对运动模型,然后在采用扩展比例导引律的条件下,设计扩张状态观测器来观测系统状态并估计目标加速度。最后针对实际系统中量测噪声较大的情况,设计带有滤波器的扩张状态观测器来估计目标加速度。这种方法无须建立机动目标模型,收敛速度快,估计精度高,明显优于常规的目标估计算法,仿真结果验证了本方法的有效性。

英文摘要：

Target maneuvering is one of the key factors to affect guidance accuracy, and this paper proposes a new idea for this problem by applying an extended state observer （ESO） to estimate target acceleration in real time. First a missile--target relative movement model is established. Then the augmented proportional navigation guidance law is applied, and the ESO is designed to estimate system states and target acceleration. Finally, for the situation that the measurement noise is very large, a new ESO with filter function is designed to estimate the target acceleration. This method does not to need to establish the model of maneuvering targets, and it has the merits of fast convergence and high precision, so it is better than the common methods of estimating target acceleration. And simulation results prove the validity of this method.