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首页> 外文期刊>Inverse Problems: An International Journal of Inverse Problems, Inverse Methods and Computerised Inversion of Data >Autofocus algorithm for synthetic aperture radar imaging with large curvilinear apertures
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Autofocus algorithm for synthetic aperture radar imaging with large curvilinear apertures

机译：具有大曲线孔径的合成孔径雷达成像的自动聚焦算法

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摘要

An approach to autofocusing for large curved synthetic aperture radar (SAR) apertures is presented. Its essential feature is that phase corrections are being extracted not directly from SAR images, but rather from reconstructed SAR phase-history data representing windowed patches of the scene, of sizes sufficiently small to allow the linearization of the forward- and back-projection formulae. The algorithm processes data associated with each patch independently and in two steps. The first step employs a phase-gradient-type method in which phase correction compensating (possibly rapid) trajectory perturbations are estimated from the reconstructed phase history for the dominant scattering point on the patch. The second step uses phase-gradient-corrected data and extracts the absolute phase value, removing in this way phase ambiguities and reducing possible imperfections of the first stage, and providing the distances between the sensor and the scattering point with accuracy comparable to the wavelength. The features of the proposed autofocusing method are illustrated in its applications to intentionally corrupted small-scene 2006 Gotcha data. The examples include the extraction of absolute phases (ranges) for selected prominent point targets. They are then used to focus the scene and determine relative target-target distances.
机译：提出了一种用于大型弯曲合成孔径雷达（SAR）孔径的自动聚焦方法。它的基本特征是，不直接从SAR图像中提取相位校正，而是从代表场景的窗口小块的重建SAR相位历史数据中提取相位校正，该数据的大小足够小以允许正向和反向投影公式的线性化。该算法分两个步骤独立处理与每个补丁相关的数据。第一步采用相位梯度类型的方法，其中从重建的相位历史记录中估算出贴片上的主要散射点的相位校正补偿（可能是快速的）轨迹扰动。第二步使用经过相位梯度校正的数据并提取绝对相位值，以这种方式消除相位歧义并减少第一级的可能瑕疵，并提供与波长可比的精度的传感器和散射点之间的距离。所提出的自动聚焦方法的功能在其对故意破坏的小场景2006年Gotcha数据的应用中得到了说明。示例包括为选定的突出点目标提取绝对相位（范围）。然后将它们用于聚焦场景并确定相对的目标-目标距离。

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