3. Observation with unknown inputs

The second aspect of observation concerns the possible presence of unknown inputs in the system. These unknown inputs are unmeasured external variables, such as disturbances or faults, which influence the behavior of internal variables or measurements. The model used in this section, which can be reduced to a more general model (Box 6), is of the form :

\begin{array}{l} \overset{\circ}{x} (t) = A x (t) + B u (t) + D d (t), \\ y (t) = C x (t), \end{array}

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Observation with unknown inputs

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Bibliography

(1) - ACKERMANN (J.) - Der entwurf linearer regelungssysteme im zustandsraum. - Automatisierungstechnik, 20(1-12), 297-300 (1972).
(2) - ÅSTRÖM (K. J.), WITTENMARK (B.) - Computer-controlled systems : theory and design. - Courier Corporation...

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