合成孔径雷达在对地面振动目标检测与特征提取时,回波信号中不可避免地存在大量的杂波,给地面振动目标的检测与特征提取带来困难.为有效抑制地杂波,进而实现地面振动目标检测与特征提取,笔者采用相位中心偏置天线技术进行杂波抑制.分析表明,经相位中心偏置天线对消后振动目标回波信号中存在一个随慢时间变化的包络项,称为慢时间包络,该项将影响振动目标微多普勒时频曲线的能量分布,导致无法获取完整的振动目标微多普勒时频曲线;进一步地,根据慢时间包络特征实现了振动目标的特征提取.最后,仿真实验验证了理论分析结果及振动目标特征提取方法的有效性. Synthetic Aperture Radar (SAR) has a lot of clutter in the echo signal when detecting and extracting the ground vibration target, which makes it difficult to detect and extract the ground vibration target.In order to effectively suppress the ground clutter and achieve the ground Vibration target detection and feature extraction, the author uses the phase center bias antenna technology for clutter suppression analysis shows that the phase center of the offset antenna after the cancellation of the target echo signal with a slow time envelope of the change, said As a slow time envelope, this will affect the energy distribution of the micro-Doppler time-frequency curve of the vibration target, resulting in failure to obtain the complete micro-Doppler time-frequency curve of the vibration target. Further, the vibration is achieved according to the slow-time envelope feature The feature extraction of the target.Finally, the simulation results verify the validity of the theoretical analysis and the method of vibration target feature extraction.