scholarly journals Analysis of ERS-1/2 synthetic aperture radar wave mode imagettes

1998 ◽  
Vol 103 (C4) ◽  
pp. 7833-7846 ◽  
Author(s):  
Vincent Kerbaol ◽  
Bertrand Chapron ◽  
Paris W. Vachon
Keyword(s):  
Synthetic Aperture Radar ◽  
Wave Mode ◽  
Synthetic Aperture ◽  
Radar Wave ◽  
Aperture Radar

scholarly journals Capabilities of Chinese Gaofen-3 Synthetic Aperture Radar in Selected Topics for Coastal and Ocean Observations

2018 ◽  
Vol 10 (12) ◽  
pp. 1929 ◽  
Author(s):  
Xiao-Ming Li ◽  
Tianyu Zhang ◽  
Bingqing Huang ◽  
Tong Jia
Keyword(s):  
Synthetic Aperture Radar ◽  
Surface Wind ◽  
Wave Mode ◽  
Sea Surface ◽  
Synthetic Aperture ◽  
Radiometric Calibration ◽  
Sea Surface Wind ◽  
Wind Retrievals ◽  
Sea Surface Wave ◽  
Aperture Radar

Gaofen-3 (GF-3), the first Chinese spaceborne synthetic aperture radar (SAR) in C-band for civil applications, was launched on August 2016. Some studies have examined the use of GF-3 SAR data for ocean and coastal observations, but these studies generally focus on one particular application. As GF-3 has been in operation over two years, it is essential to evaluate its performance in ocean observation, a primary goal of the GF-3 launch. In this paper, we offer an overview demonstrating the capabilities of GF-3 SAR in ocean and coastal observations by presenting several representative cases, i.e., the monitoring of intertidal flats, offshore tidal turbulent wakes and oceanic internal waves, to highlight the GF-3’s full polarimetry, high spatial resolution and wide-swath imaging advantages. Moreover, we also present a detailed analysis of the use of GF-3 quad-polarization data for sea surface wind retrievals and wave mode data for sea surface wave retrievals. The case studies and statistical analysis suggest that GF-3 has good ocean and coastal monitoring capabilities, though further improvements are possible, particularly in radiometric calibration and stable image quality.

Born inversion of surface-scattered SAR (synthetic aperture radar) wave field

1991 ◽  
Vol 69 (10) ◽  
pp. 1256-1260 ◽  
Author(s):  
Wooil M. Moon
Keyword(s):  
Synthetic Aperture Radar ◽  
Wave Field ◽  
Correction Term ◽  
Image Formation ◽  
Scattered Wave ◽  
Synthetic Aperture ◽  
Curvature Correction ◽  
Formation Technique ◽  
Radar Wave ◽  
Aperture Radar

A new approach to synthetic aperture radar (SAR) digital image formation, based on inverse scattering theory, is derived as an alternative to the conventional method of imaging surface-scattered wave fields. The conventional image formation technique for high-resolution SAR data utilized azimuth compression using correlation in the range-Doppler domain. More recent approaches in SAR image formation algorithms exploit downward extrapolation of the wave field in the frequency–wavenumber (f–k) domain to perform not only the azimuth compression but also the range curvature correction at the same time, with improved quality of the final image. In this paper, imaging of the SAR wave field is formulated with the Born inversion approach, which includes a range-curvature-correction term that is valid at all ranges of image formation. This new inversion formula is established to exploit f–k domain computation, from which the complex backscattering coefficient, defined by the ratio of the backscattered wave field to the incident wave field, can be accurately estimated from the observed back-scattered wave field.

scholarly journals Assessment of Sentinel-1A/B SAR Derived Ocean Wind Speeds against HY-2B Scatterometer in the Presence of Ocean Swells

2021 ◽  
Vol 299 ◽  
pp. 01001
Author(s):  
He Wang ◽  
Chaoying Shi ◽  
Jianhua Zhu
Keyword(s):  
Synthetic Aperture Radar ◽  
Wave Mode ◽  
Synthetic Aperture ◽  
Wind Speeds ◽  
Comparison Results ◽  
Ocean Winds ◽  
Spatio Temporal ◽  
Ocean Wind ◽  
Good Agreement ◽  
Aperture Radar

Sentinel-1A/B satellites operating in wave mode provide ocean winds dataset on a continuous and global basis. In this study, wind speeds derived from Sentinel-1A/B wave mode imagery from November 2018 to October 2020 are evaluated against HSCAT scatterometer aboard Chinese satellite HY-2B. Here, due to the close equatorial crossing times between Sentinel-1 and HY-2B, the spatio-temporal criteria of 50 km and 30 min yield large amount match-ups. Comparison results show a good agreement between wind speeds derived from the two types of radars: synthetic aperture radar and scatterometer. Impact of the presence of pure swell on the evaluation results is also discussed.

scholarly journals Indian Ocean Crossing Swells: New Insights from “Fireworks” Perspective Using Envisat Advanced Synthetic Aperture Radar

2021 ◽  
Vol 13 (4) ◽  
pp. 670
Author(s):  
He Wang ◽  
Alexis Mouche ◽  
Romain Husson ◽  
Bertrand Chapron
Keyword(s):  
Indian Ocean ◽  
Synthetic Aperture Radar ◽  
Wave Mode ◽  
Ocean Basin ◽  
Synthetic Aperture ◽  
Agulhas Current ◽  
Current Interaction ◽  
The Indian Ocean ◽  
Current Region ◽  
Aperture Radar

Synthetic Aperture Radar (SAR) in wave mode is a powerful sensor for monitoring the swells propagating across ocean basins. Here, we investigate crossing swells in the Indian Ocean using 10-years Envisat SAR wave mode archive spanning from December 2003 to April 2012. Taking the benefit of the unique “fireworks” analysis on SAR observations, we reconstruct the origins and propagating routes that are associated with crossing swell pools in the Indian Ocean. Besides, three different crossing swell mechanisms are discriminated from space by the comparative analysis between results from “fireworks” and original SAR data: (1) in the mid-ocean basin of the Indian Ocean, two remote southern swells form the crossing swell; (2) wave-current interaction; and, (3) co-existence of remote Southern swell and shamal swell contribute to the crossing swells in the Agulhas Current region and the Arabian Sea.

Synthetic Aperture Radar Wave Observations During GOASEX

1981 ◽  
pp. 459-467 ◽  
Author(s):  
F. I. Gonzalez ◽  
R. A. Shuchman ◽  
D. B. Ross ◽  
C. L. Rufenach ◽  
J. F. R. Gower
Keyword(s):  
Synthetic Aperture Radar ◽  
Synthetic Aperture ◽  
Radar Wave ◽  
Aperture Radar
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