Radar echo simulation of wind turbine blade based on all angle domain attribute scattering center

Abstract

Accurately simulating and analyzing the radar echo of wind turbine(WT) blades and its Doppler characteristics is a key issue in solving the reradiation interference of wind farms to radar stations. Aiming at the problem that existing algorithms cannot accurately and in real time simulate the dynamic blade echo, based on multi view parameter estimation and fusion technology, a method of dynamic WT blade radar echo simulation based on attribute scattering center is proposed. Divide the entire rotation period of the blade 360° into multiple sub-angle domains, and based on the attribute scattering center model and greedy algorithm of orthogonal matching pursuit, the parameter set of attribute scattering center of blade is extracted, and the scattered electric field data of one rotation of blade is reconstructed. The real-time simulation and doppler characteristic analysis of dynamic blade echo are realized by using short-time Fourier transform. Taking the blades of Jinfeng 82/1500 wind turbine as an example, comparing analysis and verification with echoes obtained by traditional echo simulation algorithms, the accurate and real-time simulation of dynamic blade echoes is realized, which provides a reference for the analysis of the electromagnetic scattering characteristics of the subsequent dynamic WT and even the multi fan array in wide area space, as well as the suppression of radar side wind farm clutter.