Abstract
In this chapter we study various types of noncausal continuous time systems. Contrary to the usual continuous time systems obeying the equations
where t ∈ ℝ+ is time, u(t) is input, y(t) is output, x(t) is the state, and −iA generates a strongly continuous semigroup, we now consider t ∈ ℝ and require −iA to be exponentially dichotomous. This amounts to dropping the causality assumption on the linear system. Various theories can be developed, parallelling existing theories for causal systems. In Section 7.1 we require −iA to be exponentially dichotomous and B and C to be bounded. This includes the direct generalization of finite-dimensional linear systems theory, where A, B, C, and D are all matrices and A does not have real eigenvalues. In Section 7.2 we pass to a formalism with two state spaces (one densely and continously imbedded into the other), where the exponentially dichotomous operator −iA on the larger state space extends that on the smaller state space, the input operator B is bounded from the input space into the larger state space, and the output operator C is bounded from the smaller state space into the output space. Also adopting a complex Hilbert space setting, we thus obtain the so-called extended Pritchard-Salamon realizations. At the same time we discuss left and right Pritchard-Salamon realizations, where only one state space is used at the time.
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© 2008 Birkhäuser Verlag AG
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(2008). Noncausal Continuous Time Systems. In: Exponentially Dichotomous Operators and Applications. Operator Theory: Advances and Applications, vol 182. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-8732-7_7
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DOI: https://doi.org/10.1007/978-3-7643-8732-7_7
Publisher Name: Birkhäuser Basel
Print ISBN: 978-3-7643-8731-0
Online ISBN: 978-3-7643-8732-7
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