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THE FUTURE OF SAR-BASED OCEANOGRAPHY

机译:基于SAR的海洋学的未来

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摘要

Since the Seasat mission in 1978, an impressive amount of information on oceanic and atmospheric features over the ocean has been derived from the thousands of images provided by spaceborne synthetic aperture radars (SARs). One important quantity that cannot be derived easily from conventional SAR data is the velocity of objects-current features and waves are visible in SAR intensity images because they modulate ocean surface roughness and slope, not because of direct sensitivity to their motions. Because of this indirect imaging mechanism, the quantitative interpretation of SAR signatures of spatially varying currents is challenging, and absolute current velocity retrievals are not possible at all. This situation can be improved by implementing operational along-track interferometry (ATI) capabilities on future SAR satellites. The ATI technique permits direct velocity measurements with spatial resolutions on the order of 100 m, which would be attractive for many applications. The ATI concept was developed more than 25 years ago, and its potential has been demonstrated in a number of experiments with airborne and spaceborne systems. This article provides an overview of the state of the art, promising applications, and expected further developments.
机译:自1978年执行Seasat任务以来,从星载合成孔径雷达(SAR)提供的成千上万张图像中获得了大量有关海洋和海洋特征的信息。无法从常规SAR数据轻易得出的一个重要量是物体的速度-当前特征和SAR强度图像中可见的波,因为它们调节了海洋表面的粗糙度和坡度,而不是因为对其运动没有直接的敏感性。由于这种间接成像机制,对空间变化电流的SAR信号进行定量解释具有挑战性,并且绝对不可能获得绝对的流速。通过在未来的SAR卫星上实现可操作的沿轨干涉测量(ATI)功能,可以改善这种情况。 ATI技术允许以100 m量级的空间分辨率进行直接速度测量,这对于许多应用而言将是有吸引力的。 ATI概念是25年前开发的,其潜力已在机载和星载系统的许多实验中得到证明。本文概述了现有技术,有希望的应用程序以及预期的进一步发展。

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  • 来源
    《Oceanography》 |2013年第2期|92-99|共8页
  • 作者

    ROLAND ROMEISER;

  • 作者单位

    Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA;

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  • 正文语种 eng
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