基于雷达相位测距的微动特征获取

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。

Feature Extraction for Target with Micro\|Motion Based on Radar Phase Derived Range

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.