Realization method of moving target detection based on along-track interferometry
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摘要: 提出了一种基于双孔径天线沿航迹向干涉(ATI, Along-Track Interferometry)的动目标检测、测速及定位的实现方法.该方法与DPCA(Displaced Phase Center Antenna)技术相比,不要求天线载体速度和脉冲重复频率之间必须满足严格的制约条件,同时克服了DPCA技术及CSI(Clutter Suppression Interferometry)技术产生的动目标回波强度随目标径向速度按正弦规律相消而降低了对慢速目标的检测能力的不足.在ATI理论分析的基础上,给出了利用干涉图像的干涉相位信息进行动目标检测、径向速度分量估计及定位的一种实现方法.这种检测方法能够完成被地面背景杂波淹没的慢速运动目标的检测、测速及定位.计算机仿真结果验证了其有效性.Abstract: An algorithm of moving target detection, radial velocity estimation and relocation based on ATI(along-track interferometry) with dual-aperture antenna was proposed. Compared with DPCA (displaced phase center antenna) technique, this method need not satisfy the strict constraint between platform velocity and pulse repetition frequency. Meanwhile, it overcame the shortcoming of decreased slow moving target detection ability because of moving target amplitude cancellation varying with radial velocity according to sinusoid rule generated by DPCA and CSI (clutter suppression interferometry) techniques. On the basis of ATI principle analysis, the realization method of moving target detection, radial velocity estimation and relocation using interferometric phase information was presented. This method can perform the detection, radial velocity estimation and relocation of moving targets masked by ground clutters. Computer simulation results show the effectiveness.
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