The application of parameter estimation to highly unstable aircraft is discussed. Included are a discussion of the problems in applying the output error method to such aircraft and demonstrates that the filter error method eliminates these problems. The paper shows that the maximum likelihood estimator with no process noise does not reduce to the output error method when the system is unstable. It also proposes and demonstrates an ad hoc method that is similar in form to the filter error method, but applicable to nonlinear problems. Flight data from the X-29 forward-swept-wing demonstrator is used to illustrate the problems and methods discussed.


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    Title :

    Application of Parameter Estimation to Highly Unstable Aircraft


    Contributors:
    R. E. Maine (author) / J. E. Murray (author)

    Publication date :

    1986


    Size :

    14 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Application of parameter estimation to highly unstable aircraft

    MAINE, RICHARD E. / MURRAY, JAMES E. | AIAA | 1988




    Application of parameter estimation to highly unstable aircraft

    Maine, Richard E. / Murray, James E. | NTRS | 1988