Application of Compatibility Checking Techniques to Dynamic Flight Test Data

摘要

This note considers matters related to the application of instrument compatibility checking techniques to flight test data. A previously developed Maximum Likelihood program has been used to study the effects of the presence of scale errors, accelerometer offsets and measurement time lags using simulated data. Some additional information on the effects of noise levels has also been obtained. The results have led to a suggested method for determination of centre of gravity location from flight data. The effects of measurement lags have been shown to have a major influence on extracted instrument parameters and a systematic procedure for the determination of relative phases has been devised and applied successfully to simulated data. These techniques have also been applied to flight data from a roller-coaster manoeuvre and a set of relative lag values clearly identified. The question of the accuracies of extracted instrument parameters and their dependence on the relative lags will be treated more fully in a subsequent publication. Keywords: Non-linear systems; Data acquisition; Estimation; System identification; Flight path reconstruction; Maximum likelihood estimates; Instrument errors; Time lag(Australia).