Wide-Swath Ocean Altimetry Using Multisatellite Single-Pass Interferometry

被引:4
|
作者
Theodosiou, Andreas [1 ]
Kleinherenbrink, Marcel [1 ]
Lopez-Dekker, Paco [1 ]
机构
[1] Delft Univ Technol, Dept Geosci & Remote Sensing, NL-2628 CN Delft, Netherlands
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2023年 / 61卷
关键词
~Bistatic synthetic aperture radar (SAR); cross-track interferometry (XTI); formation flying; interferometry; microwave remote sensing; multistatic SAR; ocean relative ele-vation measurement; SAR; IMPACT; SPECTRUM; WAVES;
D O I
10.1109/TGRS.2023.3287675
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Estimating sea surface height using cross-track interferometry (XTI) requires high sensitivity because the ocean surface signal is in the order of 10 cm. In addition, the interferometer requires a temporal delay of a few milliseconds to ensure the coherency of the moving ocean surface. We show that a squinted line of sight (LoS), in combination with a helix satellite formation, allows optimizing the effective perpendicular and along-track baselines to satisfy these conditions. This article presents a model to estimate the performance of a formationflying cross-track interferometer with a squinted LoS. The tenth Earth Explorer, Harmony, which features two bistatic synthetic aperture radar (SAR) companions, and a theoretical system with one monostatic and one bistatic SAR are used as case studies. The standard deviation of the height estimate is 1-10 cm between 29. and 41. and increases to 30 cm at the far range (46.) at a wind speed of 5 ms-1. The power spectral density of the elevation shows that spatial scales of 47 km can be resolved. The performance improves at higher wind speeds due to higher backscattering. At a wind speed of 15 ms-1, the wavelengths from 27 to 11 km can be resolved, depending on the elevation spectrum. The performance over a 250-km swath enables the instantaneous estimation of the surface elevation at the submesoscales for the first time.
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页数:21
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