The Generalised Discrete Algebraic Riccati Equation in LQ optimal control

Details The Generalised Discrete Algebraic Riccati Equation in LQ optimal control The Generalised Discrete Algebraic Riccati Equation in LQ optimal control

2012-01-18

arxiv.org/abs/1201.3704v1

Mathematics

Optimization and Control

Scientific paper

This paper investigates the properties of the solutions of the generalised discrete algebraic Riccati equation arising from the solution of the classic infinite-horizon linear quadratic control problem. In particular, a geometric analysis is used to study the relationship existing between the solutions of the generalised Riccati equation and the output-nulling subspaces of the underlying system and the corresponding reachability subspaces. This analysis reveals the presence of a subspace that plays an important role in the solution of the related optimal control problem, which is reflected in the generalised eigenstructure of the corresponding extended symplectic pencil. In establishing themain results of this paper, several ancillay problems on the discrete Lyapunov equation and spectral factorisation are also addressed and solved.

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