Abstract:

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.