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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Extended Azimuth Nonlinear Chirp Scaling Algorithm for Bistatic SAR Processing in High-Resolution Highly Squinted Mode
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Extended Azimuth Nonlinear Chirp Scaling Algorithm for Bistatic SAR Processing in High-Resolution Highly Squinted Mode

机译：高分辨率高斜视模式下双基地SAR处理的扩展方位角非线性线性调频缩放算法

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摘要

Accurate focusing of highly squinted azimuth-variant bistatic synthetic aperture radar data is a difficult issue due to the relatively large range migration, sensibility of the higher order terms, and the inherent geometric variance. To accommodate for this problem, extended azimuth nonlinear chirp scaling algorithm is investigated in this letter. First, range-azimuth coupling is mitigated through a linear range walk correction operation, and then, bulk secondary range compression is implemented to compensate the residual range cell migration and cross-coupling terms. Following which, the characteristics of the azimuth-dependent quadratic and cubic phase terms are analyzed, and modified scaling coefficients are derived by adopting higher order approximation and incorporating the azimuth-dependent range offset caused by the inherent geometric configuration. Compared with traditional nonlinear chirp scaling method, large azimuth depth of focusing can be realized without changing the overall procedure. Simulation results validate the effectiveness of the proposed algorithm.
机译：由于斜距离相对较大，高阶项的灵敏度以及固有的几何差异，对高度斜视的方位角变化的双基地合成孔径雷达数据进行精确聚焦是一个难题。为了解决这个问题，本文研究了扩展方位角非线性线性调频缩放算法。首先，通过线性范围游动校正操作减轻了范围-方位耦合，然后，实现了大范围的次级范围压缩，以补偿剩余的范围单元迁移和交叉耦合项。随后，分析了与方位角有关的二次相和三次相项的特性，并通过采用高阶近似并结合了由固有几何结构引起的与方位角有关的范围偏移，得出了修正的比例系数。与传统的非线性线性调频标定方法相比，无需改变整体程序就可以实现较大的方位角聚焦深度。仿真结果验证了该算法的有效性。

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