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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Advanced Remote Sensing of Internal Waves by Spaceborne Along-Track InSAR—A Demonstration With TerraSAR-X
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Advanced Remote Sensing of Internal Waves by Spaceborne Along-Track InSAR—A Demonstration With TerraSAR-X

机译：星载沿轨InSAR对内波的高级遥感—以TerraSAR-X演示

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摘要

Since the SEASAT mission in 1978, satellite-based synthetic aperture radar (SAR) images have been used to study oceanic internal waves. Internal waves become visible in SAR images because their orbital currents modulate the surface roughness. While this leads to an accurate spatial representation of internal wave patterns, the complexity of the imaging mechanism makes it difficult to derive actual currents and internal wave amplitudes from SAR signatures. We demonstrate in this paper how a more robust parameter retrieval is possible with along-track interferometric SAR (InSAR) data that resolve amplitudes and temporal phase changes of the backscattered signal together, the latter of which are directly related to the scatterers' line-of-sight velocities. Our example data set, which was acquired by TerraSAR-X in Dual Receive Antenna mode at Dongsha (South China Sea), exhibits strong signatures of internal waves in the interferogram amplitude and phase. We use a simple internal soliton parameterization and a numerical radar imaging model to find a plausible combination of internal wave parameters, which leads to good agreement between simulated and observed signatures. Testing the sensitivity of radar amplitude and phase signatures to various parameters, we show that along-track InSAR data should generally permit more accurate and less ambiguous internal wave parameter retrievals than conventional SAR images.
机译：自1978年SEASAT任务以来，基于卫星的合成孔径雷达（SAR）图像已用于研究海洋内部波。内部波在SAR图像中变得可见，因为它们的轨道电流会调节表面粗糙度。虽然这导致内部波型的准确空间表示，但是成像机制的复杂性使得很难从SAR信号中得出实际电流和内部波幅。我们在本文中演示了如何使用沿轨道干涉SAR（InSAR）数据来更健壮的参数检索，该数据可以一起解决后向散射信号的幅度和时间相位变化，后者直接与散射体的视线相关视线速度。我们的示例数据集是由TerraSAR-X在东沙（南海）的双接收天线模式下采集的，在干涉图的振幅和相位方面显示出内波的强信号。我们使用简单的内部孤子参数化和数值雷达成像模型来找到内部波参数的合理组合，从而导致模拟和观测特征之间的良好一致性。测试了雷达振幅和相位签名对各种参数的敏感性，我们表明，与传统的SAR图像相比，沿轨InSAR数据通常应允许更准确和较少歧义的内波参数检索。

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