基于LFM信号的风轮机叶片回波模型与分析

Wind Turbine Blade Echo Model and Analysis Based on LFM Signal

针对风轮机叶片对空管雷达设备的严重干扰问题,依据散射点叠加原理,提出了一种风轮机叶片回波模型。首先,按照LFM信号体制构建了风轮机叶片回波模型,考虑了风轮机回波信号随风轮机叶片旋转的变化特性,探究了信号相位与散射点间的变化关系。其次,利用所提模型研究了风轮机叶片(Wind Turbine Blade,WTB)回波信号在时域、频域以及时频域的特征。然后分析了风轮机叶片在时域的"闪烁效应"以及频域的集聚效应对雷达信号处理造成影响。最后,通过仿真证明了WTB回波模型的有效性,为风轮机杂波抑制提供了相关理论基础。

In this paper,a wind turbine blade echo model is proposed for the severe interference problem of radar equipment,based on the principle of scattering point superposition.Firstly,the wind turbine blade echo model was constructed according to the LFM signal system.The model considers the variation characteristics of the wind turbine echo signal with the rotation of the wind turbine blade,and explores the relationship between the signal phase and the scattering point.Secondly,the characteristics of wind turbine blade(WTB)echo signals in time domain,frequency domain and time-frequency domain were studied by using the proposed model.Then,the"flash effect"of the wind turbine blade in the time domain and the agglomeration effect in the frequency domain were analyzed to affect the radar signal processing.Finally,the simulation results prove the effectiveness of the echo model,which provides a theoretical basis for wind turbine clutter suppression.