1993 年 41 巻 474 号 p. 415-425
This paper mainly discusses about the physical relations between flight data, analysis methods and aerodynamic characteristics. This 5th report forcuses the effects of gusts and time lags in flight data on the estimations, which use the equation error method and the perpendicular error method proposed by the 4th report. Gusts are essentially profitable for aerodynamic derivative estimations. If air data are precisely measured in strong gusts, multicollinearities diminish so that all aerodynamic derivatives are more exactly estimated. The time lag of a certain variable generates the virtual aerodynamic force in proportion to the time-derivative of its variable, and the estimation results include this virtual force component. As gusts are airfiows moving along an airplane, the effects of their time lags on airdata and regression models should be noted.