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International audience; This paper addresses the problem of finding the trajectory, for a glider, that maximizes the final velocity and respect both initial and terminal conditions on the state. A new set of differential equations governing the system, deduced using optimal control theory, is proposed. To solve this system of equations, an algorithm based on an indirect shooting method is described. It provides paths for which the final speed is higher than the one obtained by a current common closed-loop method.

International audience; In this paper, the problem of finding minimum length paths for a Dubins' vehicle that can only move forward in an heterogeneous environment is considered. An hybrid version of the Pontryagin's maximum principle is used to derive necessary conditions for optimality. Unlike in the case of homogeneous environments, it is deduced that heterogeneity of the environment implies that optimal paths can contain reflections. A subclass of environments is analyzed more specifically in order to obtain additional necessary conditions. Based on these results, two concrete application cases are detailed to demonstrate the usefulness of the approach in practice. The first example concerns a mobile robot and the second example concerns a glider.