Parameter identification for hypersonic vehicle based on maximum-likelihood method

Model identification technique is crucial in the hypersonic vehicle design and development. In the paper, for the complicated aerodynamics characteristic and aero-propulsion coupling longitudinal model of a hypersonic vehicle, a parameter identification method based maximum likelihood criterion is proposed. Firstly, aerodynamics characteristic of hypersonic vehicle is described as 2-order nonlinear model with aero-propulsion coupling. And then, maximum likelihood criterion function is decided, and Newton-Raphson iterative method is used to solve 47 unknown estimated values by the Observed values of the velocity, the altitude, the attack angle. Finally, Simulation studies demonstrate that the proposed identification method is efficient.