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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。
In order to detect the tangential moving target based on Synthetic Aperture Radar (SAR), a detection method based on multi-view image sequence tracking is proposed. In SAR multispectral image sequences, the displacement trajectories of ground moving targets with tangential velocity between sub-view images can be approximated as a diagonal line. This algorithm uses the dynamic programming with directivity constraint to realize the trajectory tracking of the moving target on the SAR multi-view image sequence, and then the non-coherent accumulation along the defocus trajectory can significantly improve the detection performance of the weak target. Based on the tracking information, the moving target tangential velocity can be estimated and the Doppler fuzzy solution can be achieved. Numerical experiments based on measured airborne SAR data demonstrate the effectiveness of this method.