Robust intercept guidance law with predesigned zero-effort miss distance convergence for capturing maneuvering targets

Abstract

In this paper, a homing guidance in a two-dimensional target-interceptor scenario is studied with an unknown target maneuver strategy. In order to capture the target with acceptable accuracy, a robust guidance law with a predesigned zero-effort miss (ZEM) distance convergence for the interceptor is proposed. In order to guarantee the ZEM distance to converge into a small region around the predesigned terminal value within a finite time, a novel function of ZEM distance is proposed. The ZEM distance convergence profile can be reasonably controlled according to the interceptor's initial state. Based on the designed profile, an initial delay control and prescribed performance control are utilized to achieve a high terminal miss distance accuracy and account for uncertainties caused by the target's unknown maneuverability. Four maneuvering strategies of the target are tested to verify the performance of the proposed guidance law.