Jitendra Raol

System Identification and Parameter Estimation

• What is system identification? A set of methods to obtain a mathematical model of a dynamic system from experimental data. • What is the goal of system identification? The obtained model should on the one hand be compact and on the other hand be adequate for the intended purpose. Such purpose may be the design of a controller for that system. • How is system identification being carried out? In dedicated experiments measurements are carried out on a system. The obtained system response is analysed, e.g. with MATLAB’s system identification toolbox ident.

Parameter Estimation using Large Amplitude Data from Real Time Simulator of an Aircraft

The usual method of estimating parameters from flight data is through analysis of small amplitude maneuvers. However, this approach generally leads to a limited coverage of the flight envelope. Analysis of data from large amplitude maneuvers is known to provide estimates over a wider range of angle of attack and sideslip. In this paper, lateral-directional aerodynamic derivatives of a highly augmented fighter aircraft are estimated by applying data partitioning and regression techniques to large amplitude data generated from real time simulator. The estimated derivatives are compared with the reference derivative values and the merits and limitations of the technique discussed