Ambiguity-free Doppler centroid estimation technique for airborne SAR using the Radon transform
Ambiguity-free Doppler centroid estimation technique for airborne SAR using the Radon transform
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DOI：
10.1109/tgrs.2005.843955
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发表时间：
2005-04
期刊：
影响因子：
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通讯作者：
Y. Kong;Byung-Lae Cho;Y. Kim
中科院分区：
文献类型：
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作者：
Y. Kong;Byung-Lae Cho;Y. Kim
在合成孔径雷达（SAR）信号处理中，多普勒中心估计技术（称为“杂波锁定”）是一项重要的技术，它关系到最终SAR图像的信噪比、几何失真和辐射误差。传统的算法要么有模糊性问题，要么计算量有点高。利用多普勒中心和斜视角直接相关的事实，我们提出了一种基于Radon变换的无模糊多普勒中心估计技术，称为基于几何的多普勒估计器。该算法计算量小，对绝对多普勒中心的估计性能良好。
In synthetic aperture radar (SAR) signal processing, the Doppler centroid estimation technique, called the "clutter-lock", is important because it is related to the signal-to-noise ratio, geometric distortion, and radiometric error of the final SAR image. Conventional algorithms have either ambiguity problems or somewhat high computational load. Using the fact that the Doppler centroid and the squint angle are directly related, we propose an ambiguity-free Doppler centroid estimation technique using Radon transform, named geometry-based Doppler estimator. The proposed algorithm is computationally efficient and shows good performance of estimating the absolute Doppler centroid.