Unknown input observer design for linear time‐invariant systems—A unifying framework

This article presents a new observer design approach for linear time invariant multivariable systems subject to unknown inputs. The is based on transformation the so-called special coordinate basis (SCB). form reveals important system properties like invertability or finite and infinite zero structure. Depending system's strong observability properties, SCB allows straightforward input utilizing nonlinear observers techniques. chosen technique does not only depend but also desired convergence behavior of observer. Hence, proposed procedure can be seen as unifying framework design.