Feature Parameters Estimation of the Rotor Target Based on ISAR Image Sequences

The paper proposed a method to estimate 5 parameters for the question of rotor target recognition, which included the rotation rate, blade number, rotor disk attitude angle, rotor disk radius and the distance of blade root from the rotor disk center. The method generated the electromagnetic scattering data obtained from different radar based on physical optics and edge diffraction, the period of the echo response of the rotor target was obtained by the autocorrelation, the ISAR image sequence was gained by the range-instantaneous doppler algorithm, the blade number could be obtained from the image and the rotation rate was obtained, the paper also deduced the nonlinear three variables equation combined of rotor disk attitude angle and rotor disk radius, so the cross range scaling of the rotor ISAR image was realized, the projection relationship of the rotor target on the ISAR image was analyzed, the way to get the distance of blade root from the rotor disk center was proposed. Finally, the method was proved to be effective by the simulation.