Positive linear systems can be stabilized by positive observers that act as monotonic upper and lower bounds on the state, with conditions covering a larger class than earlier designs and extensions to non-positive and stochastic cases.
A survey of interval observers design methods and implementation for uncertain systems,
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Positive Observers Revisited
Positive linear systems can be stabilized by positive observers that act as monotonic upper and lower bounds on the state, with conditions covering a larger class than earlier designs and extensions to non-positive and stochastic cases.