Performance of system identification of aircraft flight characteristics quite depends on flight data to be analyzed. In order to make the system identification more useful and reliable, a realtime flight data evaluator which determines appropriate parts of data is proposed. The proposed method is characterized by multi resolution analysis (MRA), a kind of wavelet transform, and validates flight in both time and frequency domains. Results to apply the proposed methods to both simulated and real

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... light data show that the proposed method has adequate capability to extract desirable parts from flight data.