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CSAR Multilayer Focusing Imaging Method
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DOI：10.1109/LGRS.2024.3397833.png)
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摘要
En 中文
Circular synthetic aperture radar (CSAR) has garnered a lot of attention because of its exceptional capabilities. However, CSAR imaging is sensitive to terrain undulation errors due to the curved trajectory. The projection of an object whose height deviates from a reference height (RH) forms a circular ring in the full-aperture image. Presently, error compensation using a digital elevation model (DEM) is a prevalent solution to this issue. Although DEM can be inverted from echo data, the accuracy is unsatisfactory. Inspired by optical multifocus image fusion methods, a CSAR multilayer focusing imaging method is proposed in this letter. First, CSAR subaperture images are used to construct multilayer focusing images by displacement compensation, which is more efficient than applying an imaging algorithm directly. Second, the multifocus image fusion method is applied to obtain a fully focusing image. Finally, the decision maps are used to invert the target region's DEM. The multilayer focusing imaging method can make objects of different heights focused. The fused result is fully focused and has a resolution of 1 m, depending on the CSAR system. The inverted DEM can visually describe the objects' contours. The experimental results demonstrate the effectiveness and practicability of the proposed method.
Keyword:
Circular synthetic aperture radar (CSAR)
multifocus image fusion
multilayer focusing imaging
terrain undulation error
期刊
IF:
16.4
论文数:
1.0W
被引数:
5.1K
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