外辐射源雷达目标扇叶微多普勒效应实验研究

Experimental study on micro-Doppler effect of target blades in passive radar

基于UHF频段外辐射源雷达系统的长期实验观测数据,重点比较研究了直升机、通航飞机、无人机、风电机组等多种目标的扇叶微动回波特征。首先,通过多径杂波抑制、主体回波去除等手段使扇叶的微动回波得以凸显。然后,详细分析了扇叶微动回波在时域、频域、时频分布图、距离-多普勒谱上的特征表现,揭示了微动特征与扇叶几何结构、运动状态等参数之间的对应关系,据此实现扇叶尺寸、转速等重要参数的反演。实验结果与理论模型吻合较好,为建立外辐射源雷达微动特征数据库,服务后续目标精细化建模、目标分类识别等深层次应用提供了数据和理论支撑。

Based on the long-term experimental data of UHF-band passive radar system,the characteristics of fan blade micro motion echo of helicopter,navigable aircraft,unmanned aerial vehicle,wind turbine and other targets are compared and studied.The micro motion echoes of the fan blades are firstly highlighted by means of multipath clutter suppression and target main echo removal,then the characteristics of the fan blade micro motion echoes in time domain,frequency domain,time-frequency domain,and Range-Doppler(RD)spectrum are analyzed in detail,and the corresponding relationships between the micro-Doppler features and the geometric structures and motion states of the fan blades are revealed.The experimental results are in good agreement with the theoretical model,which provides data and theoretical supports for the establishment of the micro-Doppler feature database of passive radar,serving for the subsequent deep-seated applications such as target fine modeling,target classification and recognition.