Application of MA-ATI SAR for Estimating the Direction of Moving Water Surface Currents in Pi-SAR2 Images
Application of MA-ATI SAR for Estimating the Direction of Moving Water Surface Currents in Pi-SAR2 Images
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DOI：
10.1109/jstars.2021.3060008
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发表时间：
2021
影响因子：
5.5
通讯作者：
Takero Yoshida;K. Ouchi;Chan-Su Yang
中科院分区：
文献类型：
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作者：
Takero Yoshida;K. Ouchi;Chan-Su Yang
提出了一种用于获取运动目标速度矢量的多孔径沿航迹干涉合成孔径雷达(MA-ATI SAR)理论。该理论利用两个天线通过多/子块处理来估计两个速度分量(后向和前向)。然后，可以通过这两个速度分量来计算移动方向。将其与传统的距离速度估计相结合，即可估计出距离向量。为了验证其方法，本研究将MA-ATI SAR应用于机载极化干涉SAR-2(PI-SAR2)，以估计河流运动水面流的方向。计算结果与真实运动方向吻合较好。估计精度显示，四种情况中有三种的方向误差约为20°。1例显示较高的误差，因为可能存在复杂的流型。这项研究的结果对MA-ATI方法在机载SAR系统中的适用性具有一定的指导意义。
A multiaperture along-track interferometric synthetic aperture radar (MA-ATI SAR) theory was proposed to obtain velocity vectors of moving objects. This theory utilizes two antennas to estimate two velocity components (aft- and fore-looking directions) by multi/sublook processing. The moving direction can then be calculated by the two velocity components. Combining it with the conventional range velocity estimation, the velocity vector can be estimated. In order to validate its methodology, the present study applies MA-ATI SAR to airborne polarimetric interfereometric SAR-2 (Pi-SAR2) for estimating the directions of moving water surface currents of rivers. The results were in good agreement with the true moving directions. The estimated accuracy showed the direction error of approximately 20° for the three cases out of four. One case showed the higher error, since there may be complicated flow patterns. The findings of this study have implications for the applicability of the MA-ATI method to an airborne SAR system.