基于多视图像序列跟踪的SAR地面运动目标检测

Moving ground target detection based on SAR multi-look image sequence tracking

为基于合成孔径雷达(SAR)检测地面切向运动目标,提出基于多视图像序列跟踪的检测方法。在SAR多视图像序列上,具有切向速度的地面运动目标在子视图像间的位移轨迹可近似为一条斜线。该算法利用具有方向性约束的动态规划实现动目标在SAR多视图像序列上的轨迹跟踪,进而沿散焦轨迹作非相干积累可显著改善微弱目标检测性能。基于跟踪信息可实现动目标切向速度估计和解Doppler模糊。基于实测机载SAR数据的数值实验证明了该方法的有效性。

A detection algorithm based on multi-look image sequence tracking was developed to detect moving ground targets with along-track motion using synthetic aperture radar（SAR）.In a SAR multi-look image sequence,the trajectory of a moving target with an along-track velocity can be approximated as a slanted line in each frame.An improved dynamic-programming approach with directional constraints is then used to track the moving target.Then the target energy is non-coherently integrated along the defocusing track to improve weak target detection.The moving target along-track velocity can be estimated from the Doppler ambiguity based on the tracking information.Numerical results based on the measured airborne SAR data demonstrate the method＇s effectiveness.