A Novel Method for Single-Channel CSAR Ground Moving Target Imaging
IEEE Sensors Journal(2019)
摘要
Recently, the parameter estimation and focusing of ground moving target in the circular SAR (CSAR) attracts widely interest in researchers. In this paper, a sub-aperture-based frequency domain algorithm that divides the CSAR trajectory into sub-apertures is proposed, which achieves better focusing quality than that of the traditional straight-line fitting method. First, the CSAR sub-aperture is fitted by a parabola with special curvature, and the effectiveness of this fitting is analyzed. Next, a parameter estimation method is proposed to estimate the motion parameters of the ground moving target for each sub-aperture. Finally, the moving target is refocused based on the estimation results. Simulation as well as the real CSAR data processing results verified the theoretical analysis of the proposed method.
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关键词
Imaging,Parameter estimation,Radar imaging,Fitting,Synthetic aperture radar,Trajectory
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