Robust Guidance and Control Algorithms Using Constant Flight Path Angle for Precision Landing on Mars (original) (raw)

AIAA Guidance, Navigation, and Control Conference and Exhibit, 2006

Abstract

This paper proposes four guidance laws aimed at reducing the most significant sources of landing dispersion during atmospheric entry at Mars. The autonomous guidance algorithms rely on simple analytic and semi-analytic solutions that prescribe segments of constantflightpath angles (FPA's) that match the trajectory constraints in terms of desired final altitude, velocity and downrange. Two one-segment solutions and two two-segment solutions are presented. A nonlinear dynamic inversion of the translational dynamics and a robust attitude controller, designed with the Robust Modal Control technique, complete the guidance and control system whose performance is demonstrated through numerical simulations of a Mars entry scenario.

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