Best techniques to perform bare-airframe system identification on unstable system with highly correlated, closed loop flight data?

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Sihai Guan

Some adaptive algorithm for nonlinear system can be used.

Such as spline adaptive algorithm or Volterra algorithm.

Marit Elisabeth Knapp

There's a great technical note by Tom Berger that will be published soon! Covers how to implement the Joint Input-Output method and provides validation with flight data.