多径反射率估计SAR图像生成算法

David A. Garrenl, J. S. Goldsteinl, D.R. Obuchon, Robert R. Greene, J. A. North
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引用次数: 26

摘要

最近的分析产生了一种创新的技术,用于形成合成孔径雷达(SAR)图像,而不会产生传统方法中出现的多路径鬼影。该技术将图像中的直接散射回波与多径回波分离,然后将每组反射映射到度量正确的图像空间。由于传统阵列处理中隐含的基本假设,当前的处理方案将多径回波放置在不正确的位置(即幽灵)。采用该算法对多径散射(IRAMS)进行图像重建,得到了两个理想的结果。首先,在主图像空间中降低了幽灵回波的强度,从而改善了图像模式与散射体物理分布之间的关系。其次,创建具有被成像场景特征信息的高维图像空间,增强多径回波的强度。这些辅助的“延迟”图像平面提供了潜在的或显著提高目标检测和识别能力。本文开发了一种鲁棒的IRAMS实现,该实现基于常规SAR图像中多径散射事件相对于相对向角变化的跨距离漂移。通过包含多径散射影响的模拟频率响应数据验证了分析结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SAR image formation algorithm with multipath reflectivity estimation
Recent analysis has resulted in an innovative technique for forming synthetic aperture radar (SAR) images without the multipath ghost artifacts that arise in traditional methods. This technique separates direct-scatter echoes in an image from echoes that are the result of multipath, and then maps each set of reflections to a metrically correct image space. Current processing schemes place the multipath echoes at incorrect (i.e., ghost) locations due to fundamental assumptions implicit in conventional array processing. Two desired results are achieved by use of this new image reconstruction algorithm for multipath scattering (IRAMS). First, the intensities or the ghost returns are reduced in the primary image space, thereby improving the relationship between the image pattern and the physical distribution of the scatterers. Second, a higher dimensional image space that enhances the intensities of the multipath echoes is created which possesses characteristic information about the scene being imaged. These auxiliary "delay" image planes offer the potential or dramatically improving target detection and identification capabilities. This paper develops a robust IRAMS implementation that is based upon the cross-range drift in conventional SAR imagery of the multipath scattering events with respect to changes in the relative aspect angle. The resulting analysis is validated via simulated frequency response data that includes the effects of multipath scattering.
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