Lateral Directional Parameter Estimation of Fly-by-wire Aircraft and Validation using simulation data

This report presents the result of the investigation related to estimation of the lateral-directional aerodynamic derivative of the highly augmented, advanced fighter aircraft from the flight like response time. Different types of pilot input are used to generate aircraft response data in the engineer in loop flight simulator(ELS)to determine which input excitation might provide the most accurate estimate of aircraft stability and control derivatives. Also MATLAB/SIMULINK based simulation platform is used to generate aircraft response with single surface excitation to evaluate the usefulness of the method for the stability and control derivatives estimation. The maximum likelihood estimation based on output error minimization technique is used to estimate the derivatives from the aircraft response data. The result indicate that accuracy of the estimated derivatives improve the persistence excitation and single surface excitation.