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Greedy measurement selection for state estimation

, 1 , * , 2 , 3 , 4

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      Parametric PDEs of the general form

      \[ \mathcal{P}(u,a)=0 \]
      are commonly used to describe many physical processes, where $\mathcal{P}$ is a differential operator, a is a high-dimensional vector of parameters and u is the unknown solution belonging to some Hilbert space V. Typically one observes m linear measurements of u(a) of the form $\ell_i(u)=\langle w_i,u \rangle$, $i=1,\dots,m$, where $\ell_i\in V'$ and $w_i$ are the Riesz representers, and we write $W_m = \text{span}\{w_1,\ldots,w_m\}$. The goal is to recover an approximation $u^*$ of u from the measurements. The solutions u(a) lie in a manifold within V which we can approximate by a linear space $V_n$, where n is of moderate dimension. The structure of the PDE ensure that for any a the solution is never too far away from $V_n$, that is, $\text{dist}(u(a),V_n)\le \varepsilon$. In this setting, the observed measurements and $V_n$ can be combined to produce an approximation $u^*$ of u up to accuracy
      \[ \Vert u -u^*\Vert \leq \beta^{-1}(V_n,W_m) \, \varepsilon \]
      \[ \beta(V_n,W_m) := \inf_{v\in V_n} \frac{\Vert P_{W_m}v\Vert}{\Vert v \Vert} \]
      plays the role of a stability constant. For a given $V_n$, one relevant objective is to guarantee that $\beta(V_n,W_m)\geq \gamma >0$ with a number of measurements $m\geq n$ as small as possible. We present results in this direction when the measurement functionals $\ell_i$ belong to a complete dictionary.

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      Author and article information

      [1 ]Université Pierre et Marie Curie
      [2 ]Sorbonne Université
      [3 ]University of South Carolina
      [4 ]Paris Dauphine
      [* ]Correspondence: james.ashton.nichols@
      ScienceOpen Posters
      27 April 2018
      Copyright © 2018

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