Design of guidance law via partial stability approach considering control loop dynamics

According to partial stability approach, a novel three dimensional finite time convergent guidance law in order to nullify the line-of-sight (LOS) angular rate is derived. The main idea of this paper is to divide state variables of guidance system into two parts and focus on finite time stabilization of only a part. The terminal sliding mode approach is employed to obtain finite time convergent guidance law. Furthermore, the autopilot dynamics is considered as a first-order transfer function and the stability analysis of guidance loop is established in spite of autopilot dynamics. The numerical simulations verify the effectiveness and robustness of the proposed guidance law against the target maneuvers.