Many current and future aircraft axe open-loop unstable, and have many control surfaces. When some of these control surfaces are damaged, the remaining control surfaces may still be capable of controlling the aircraft, if the controller is reconfigured quickly enough.To speed up the parameter identification, signals can be injected to ensure sufficient excitation. This signal injection must be done in a way that does not annoy the pilot. The signal injection must also not counter the goals of the control allocation, which used the redundant surfaces to obtain the desired control moments while optimizing some cost function. This paper describes a method for rapid identification of parameters. Signal injection is used in a way that has no effect on the ideal system, since the redundant surfaces are moved in ways that do not affect the rigid body motion of the aircraft. The injected signals also have little or no effect on the other optimization objectives such as load alleviation and drag reduction.

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