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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >On the Doppler Spreading Effect for the Range-Instantaneous-Doppler Technique in Inverse Synthetic Aperture Radar Imagery
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On the Doppler Spreading Effect for the Range-Instantaneous-Doppler Technique in Inverse Synthetic Aperture Radar Imagery

机译：反向合成孔径雷达成像中距离瞬时多普勒技术的多普勒扩展效应

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摘要

Inverse synthetic aperture radar (ISAR) is an all-weather radar technique which may generate high-resolution images of noncooperative targets. The standard range-Doppler algorithm (RDA) is usually employed for image generation. However, the images obtained with RDA are usually blurred because of the relative motion between radar and target. As a consequence, motion compensation techniques should be used to improve the imagery quality. The range-instantaneous-Doppler (RID) technique based on time–frequency transforms has been proposed for obtaining a sequence of focused ISAR images without the need of using motion compensation techniques. However, in this letter, it is clearly shown that the migration of the target scatterers in slant range indirectly induces Doppler spreading of the scatterers' point spread function in each of the ISAR images obtained by the RID technique. This Doppler spreading means blurring. It is important to highlight that the migration in slant range may be caused not only by the radial component of the translational motion but also by the rotational motion. The application of motion compensation techniques prior to the use of the RID technique allows us to mitigate the Doppler spreading, as shown here both for simulated and live data acquired by a high-resolution coherent radar.
机译：反向合成孔径雷达（ISAR）是一种全天候雷达技术，可以生成非合作目标的高分辨率图像。标准距离多普勒算法（RDA）通常用于图像生成。但是，由于雷达和目标之间的相对运动，使用RDA获得的图像通常模糊不清。因此，应使用运动补偿技术来改善图像质量。已经提出了基于时频变换的距离瞬时多普勒（RID）技术，无需使用运动补偿技术即可获得一系列聚焦的ISAR图像。然而，在这封信中，清楚地表明，目标散射体在倾斜范围内的迁移间接导致了在通过RID技术获得的每个ISAR图像中散射体的点扩展函数的多普勒扩展。多普勒扩散意味着模糊。重要的是要强调，倾斜范围内的迁移不仅可能由平移运动的径向分量引起，而且还可能由旋转运动引起。在使用RID技术之前，运动补偿技术的应用使我们能够减轻多普勒扩展，如此处所示，这是针对高分辨率相干雷达采集的模拟数据和实时数据。

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