In this paper, a new nonlinear observer (θ-D observer) is proposed to estimate the feedback states for optimal control of a highly maneuverable aircraft. This observer is derived by constructing the dual of a recently developed nonlinear optimal control technique-known as the θ-D technique. The θ-D optimal control approach provides an approximate closed-form solution to the Hamilton-Jacobi-Bellman (HJB) equation. An optimal flight controller using this technique is designed for a highly maneuverable aircraft operating at high angle of attack where the θ-D observer is employed to estimate the states for feedback. The structure of this observer is similar to the State Dependent Riccati Equation Filter (SDREF). However, the new method provides a closed-form observer gain and does not need time-consuming online computations of the algebraic Riccati equation at each instant as the SDREF. The theoretical results about this new observer are given. The simulation shows that the θ-D control and observer exhibit excellent performance for this flight control problem.
S. N. Balakrishnan and M. Xin, "A New State Observer and Flight Control of Highly Maneuverable Aircraft," Proceedings of the American Control Conference, Institute of Electrical and Electronics Engineers (IEEE), Jun 2009.
The definitive version is available at https://doi.org/10.1109/ACC.2009.5160194
American Control Conference
Mechanical and Aerospace Engineering
Keywords and Phrases
Flight Control; Observers for Nonlinear Systems; Optimal Control
Article - Conference proceedings
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