针对微动目标的雷达回波特征信号一般较小难以提取的特点,提出了一种基于雷达相位测距的微动特征获取方法.相参雷达工作在宽窄交替模式下,宽带信号形式为线性调频(Linear Frequency Modulation,简称LFM).首先,通过窄带相位测距(游标测距)测量目标质心的平动轨迹；其次,通过宽带相位测距测量目标上各个散射中心的运动轨迹；最后,从散射中心运动轨迹中除去质心平动轨迹,获得散射中心相对于质心的微动轨迹.相位测距精度极高,已知微动模型,可以估计微动参数,获取微动特征.仿真结果表明,该方法可以有效获取目标的微动特征.%For the difficulty to extract the radar echo from a micro-motion target with weak reflection intensity, a method of feature extraction for micro-motion target is proposed based on phase derived range in this paper. Coherent radar transmits wideband and narrowband signals alternately, and the wideband signal is Linear Frequency Modulated ( LFM). The trajectory of target' s centroid is measured by narrowband phase derived range (Range Vernier). Then, each scattering point' s trajectory is measured by wideband phase derived range. At last, each scattering point' s micro-motion trajectory is obtained by subtracted the centroid' s trajectory from each scattering point' s trajectory. The accuracy of phase derived range is very high, with the given micro-motion mode, the parameters of micro-motion can be estimated and the features of micro-motion can be extracted. Simulation results show that the method can extract features of micro-motion effectively.
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