Simulation of the Doppler echoes from wind turbine based on scattered electric field calculation

Abstract

Clutter filtering according to distinct Doppler echoes is a major measure to deal with the interference in radar signals caused by the rotating blades of nearby wind turbines. For the problem that the traditional simulation method of scattering point superposition model could not simulate the continuity of induced current on the blade's complex surface, the authors proposed a new simulation method of Doppler echoes based on scattered electric field calculation and expounded the basic principle and implementation steps of the method. First, they found the correspondence between the electric field's complex amplitude vector and the echo signal by deducing the equations of echo signal and scattering electric field; second, they used the quasi-static technique, the hybrid algorithm of physical optics and method of moment to achieve an accurate solution of the scattered electric field sequence; finally, the authors used the short-time Fourier transform to obtain the time-frequency domain data of blades Doppler echoes. The result was compared with data obtained from the scattering point superposition model and in-field experiments, and the accuracy of the proposed method was verified.