Abstract:
The use of high-fidelity radar echo simulation of dynamic wind turbine blades to analyze the Doppler characteristics is the key issue to decrease the reradiation interference from wind farms on radar stations. Aiming at the problem that none of the existing algorithms could accurately simulate dynamic blade radar echo in real time, the traditional idea of using static scattering center under single view to simulate blade echo is broken. Thus, we proposed a dynamic wind turbine blade radar echo simulation method based on multi-view attribute scattering centers, with the large rotation angle of blade in radar line-sight dividing into multiple sub views. Since the blade's spatial attitude had an effect on the scattering center's parameters, the attribute scattering center model and the greedy algorithm of orthogonal matching pursuit were used, in order to extract the scattering center of dynamic blade under each radar view. Therefore, the time- correspondence between the scattering center and the blade motion characteristics were established, and then the scattering electric field data of one rotation was reconstructed. Finally, the real-time simulation of dynamic blade echo was realized by the short-time Fourier transform. Taking the GW82-1500 wind turbine blade as an example, the simulation results between the experiment and the traditional algorithm and the proposed algorithm were compared. It shows that the proposed algorithm is 34.7% more accurate than the integral algorithm on scattering center, and especially, the real-time simulation of the dynamic blade echo is realized.