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A Method to Evaluate Residual Phase Error for Polar Formatted Synthetic Aperture Radar Systems

机译：极坐标合成孔径雷达系统残余相位误差的评估方法

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摘要

Synthetic aperture radar systems that use the polar format algorithm are subject to a focused scene size limit inherent to the polar format algorithm. The classic focused scene size limit is determined from the dominant residual range phase error term. Given the many sources of phase error in a synthetic aperture radar, a system designer is interested in how much phase error results from the assumptions made with the polar format algorithm. Autofocus algorithms have limits to the amount and type of phase error that can be corrected. Current methods correct only one or a few terms of the residual phase error. A system designer needs to be able to evaluate the contribution of the residual or uncorrected phase error terms to determine the new focused scene size limit. This paper describes a method to estimate the complete residual phase error, not just one or a few of the dominant residual terms. This method is demonstrated with polar format image formation, but is equally applicable to other image formation algorithms. A benefit for the system designer is that additional correction terms can be added or deleted from the analysis as necessary to evaluate the resulting effect upon image quality.
机译：使用极坐标格式算法的合成孔径雷达系统受到极坐标格式算法固有的聚焦场景大小限制。经典的聚焦场景大小限制是根据主要残差范围相位误差项确定的。考虑到合成孔径雷达中相位误差的多种来源，系统设计师对极坐标格式算法所做的假设会导致多少相位误差感兴趣。自动聚焦算法对可以校正的相位误差的数量和类型有限制。当前的方法仅校正残余相位误差的一项或几项。系统设计人员需要能够评估残留或未校正的相位误差项的贡献，以确定新的聚焦场景大小限制。本文介绍了一种估计完整残留相位误差的方法，而不仅仅是一个或几个主要残留项。该方法已在极坐标格式图像形成中得到证明，但同样适用于其他图像形成算法。对于系统设计人员来说，一个好处是，可以根据需要在分析中添加或删除其他校正项，以评估结果对图像质量的影响。

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