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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Theoretical Application of Overlapped Subaperture Algorithm for Quasi-Forward-Looking Parameter-Adjusting Spotlight SAR Imaging
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Theoretical Application of Overlapped Subaperture Algorithm for Quasi-Forward-Looking Parameter-Adjusting Spotlight SAR Imaging

机译：重叠子孔径算法在准前瞻参数调整聚光SAR成像中的理论应用

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摘要

This letter theoretically extends and applies the overlapped subaperture algorithm (OSA) for the challenging spotlight synthetic aperture radar (SAR) imaging in a quasi-forward-looking (QFL) geometry. A parameter-adjusting framework, in which the radar parameters relate closely to the geometry, is employed to mitigate the spatial signal coupling. By innovatively fitting the phase error induced by the planar wavefront assumption directly to the wavenumbers, both the linear and quadratic phase errors, which determine the geometrical distortion and the defocusing effects, respectively, can be accurately expressed and then corrected. When compared with the parameter-adjusting polar format algorithm proposed by the authors in previous work, the OSA is superior in contributing to an expanded imaging swath. The validity of the OSA methodology is demonstrated by the simulation of a Ka-band SAR working in the QFL diving mode with an extreme 85° squint angle.
机译：从理论上讲，这封信扩展了重叠子孔径算法（OSA）并将其应用于准前瞻（QFL）几何形状中具有挑战性的聚光合成孔径雷达（SAR）成像。采用参数调整框架，其中雷达参数与几何形状密切相关，以减轻空间信号耦合。通过创新性地将平面波前假设引起的相位误差直接拟合到波数，可以分别精确地表示然后校正分别确定几何失真和散焦效果的线性和二次相位误差。与作者在先前的工作中提出的参数调整极坐标格式算法相比，OSA在扩展成像范围方面具有优势。 OSA方法的有效性通过在QFL潜水模式下以85°极端斜视角工作的Ka波段SAR的仿真得到证明。

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