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首页> 外文期刊>IEEE Transactions on Aerospace and Electronic Systems >Autofocus Correction of APE and Residual RCM in Spotlight SAR Polar Format Imagery
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Autofocus Correction of APE and Residual RCM in Spotlight SAR Polar Format Imagery

机译：Spotlight SAR极坐标图像中APE和残留RCM的自动聚焦校正

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摘要

Synthetic aperture radar (SAR) images are often blurred by phase perturbations induced by uncompensated sensor motion and/or unknown propagation effects caused by turbulent media. To get refocused images, autofocus proves to be a useful postprocessing technique applied to estimate and compensate the unknown phase errors. However, a severe drawback of the conventional autofocus algorithms is that they are only capable of removing one-dimensional azimuth phase errors (APEs). As the resolution becomes finer, residual range cell migration (RCM), which makes the defocus inherently two dimensional (2-D), becomes a new challenge. In this paper, correction of APE and residual RCM are presented in the framework of polar format algorithm (PFA). First, an insight into the underlying mathematical mechanism of polar reformatting is presented. Then, based on this new formulation, the effect of polar reformatting on the uncompensated APE and residual RCM is investigated in detail. By using the derived analytical relationship between APE and residual RCM, an efficient 2-D autofocus method is proposed. Experimental results indicate the effectiveness of the proposed method.
机译：合成孔径雷达（SAR）图像通常会因未补偿的传感器运动和/或由湍流介质引起的未知传播效应引起的相位扰动而变得模糊。为了获得重新聚焦的图像，自动聚焦被证明是一种有用的后处理技术，可用于估计和补偿未知相位误差。然而，常规自动聚焦算法的严重缺陷在于它们仅能够消除一维方位角相位误差（APE）。随着分辨率的提高，剩余距离像元迁移（RCM）使固有的二维（2-D）离焦成为一项新的挑战。本文在极性格式算法（PFA）的框架内提出了APE和残留RCM的校正方法。首先，介绍了极性重新格式化的基本数学机制。然后，在此新配方的基础上，详细研究了极性重新格式化对未补偿的APE和残余RCM的影响。通过推导APE和残余RCM之间的解析关系，提出了一种有效的二维自动聚焦方法。实验结果表明了该方法的有效性。

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