Modified Guidance Law and Operational Logic for Auto-Approach of Unmanned Air Systems

Abstract

Unmanned air vehicles should be operated by various flight modes, such as point navigation, loitering, preprogrammed mode and so forth. Since all flight modes can be applied by combining the line-of-sight and loitering guidance laws, the performance and formulation are dependent on the reliability and accuracy of both guidance laws. This paper presents the modified guidance laws and shows the enhanced performance via simulation. In addition, the logical operation and transition logic should be made according to real implementation of the flight modes by considering various flight conditions. This paper also proposes enhanced operation logics for the auto-approach mode, which are formulated after successfully reflecting a variation of the vehicle's current position. Finally, the evaluation is performed through simulations of several flight scenarios.