Comparison of topography- and aperture-dependent motion compensation algorithms for airborne SAR
Comparison of topography- and aperture-dependent motion compensation algorithms for airborne SAR
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DOI：
10.1109/lgrs.2007.895712
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发表时间：
2007-07-01
影响因子：
4.8
通讯作者：
Mallorqui, Jordi J.
中科院分区：
文献类型：
--
作者：
Prats, Pau;Camara de Macedo, Karlus A.;Mallorqui, Jordi J.
这封信对机载合成孔径雷达 (SAR) 系统的三种基于傅里叶的运动补偿 (MoCo) 算法进行了比较。这些算法规避了传统 MoCo 的局限性，即参考高度的假设和梁中心近似。所有这些方法都依赖于 SAR 系统中固有的时频关系，但以不同的方式利用它，从而导致精度和计算负担方面的差异。在简要概述这三种方法之后，分析了每种算法在方位角地形调节、角度调节以及算法可以应对的航迹偏差最大频率方面的性能。此外，还对计算复杂度进行了分析。使用德国航空航天中心 (DLR) 实验 SAR 系统获取的真实数据显示定量结果。
This letter presents a comparison between three Fourier-based motion compensation (MoCo) algorithms for airborne synthetic aperture radar (SAR) systems. These algorithms circumvent the limitations of conventional MoCo, namely the assumption of a reference height and the beam-center approximation. All these approaches rely on the inherent time-frequency relation in SAR systems but exploit it differently, with the consequent differences in accuracy and computational burden. After a brief overview of the three approaches, the performance of each algorithm is analyzed with respect to azimuthal topography accommodation, angle accommodation, and maximum frequency of track deviations with which the algorithm can cope. Also, an analysis on the computational complexity is presented. Quantitative results are shown using real data acquired by the Experimental SAR system of the German Aerospace Center (DLR).