Abstract
A modified output error method was developed by the authors, the application of which on YF16 aircraft have been reported in our previous paper. In this paper, we applied the method on ALFLEX (Automatic Landing Flight Experiment) flight data supplied by NAL/NASDA for estimating the aerodynamic characteristics and the input control histories. The results show that, the time histories of the altitude, the total velocity, Euler angles are very precisely estimated like our previous applications. Then, we have tried to verify the performance in more detail, particularly for high frequency characteristics. The applied data include the effect of intentional control surfaces vibration inputs. The result shows that the method is also effective to these high frequency variations.
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