Normalized Radar Cross Sections of Sea Surface Estimated using Asymptotic and Semi-Empirical Methods Inc Band

C band microwave radars have been widely used in ocean observations, e.g. oil spill monitoring, ship detection, wind speed retrieval, etc. All these applications rely on the measured normalized radar cross section (NRCS) of sea surface. Therefore, it is necessary to develop accurate models to predic...

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Bibliographic Details
Main Authors: Zheng, Honglei, Khenchaf, Ali, Ghanmi, Helmi, Wang, Yunhua, Zhao, Chaofang
Format: Conference Proceeding
Language:English
Subjects:
C band radar
empirical model CMOD5
NRCS
Numerical models
Radar cross-sections
Rough surfaces
Scattering
Sea spectrum
Sea surface
SPM
SSA
Surface roughness
TSM
Wind speed
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Summary:C band microwave radars have been widely used in ocean observations, e.g. oil spill monitoring, ship detection, wind speed retrieval, etc. All these applications rely on the measured normalized radar cross section (NRCS) of sea surface. Therefore, it is necessary to develop accurate models to predict the radar cross sections of sea surface. In this paper, based on the six commonly used sea spectra models, i.e. Elfouhaily, Hwang, Romeiser, Apel, Fung and Pierson spectra, the normalized radar cross sections are calculated by Small Perturbation Method (SPM), Two Scale Model (TSM) and the first order Small Slope Approximation (SSA-1), respectively. Meanwhile, to better evaluate the accuracy of different sea spectra, comparisons between numerical calculations and the empirical CMOD5 model are made for various incident angles, wind speeds, and wind directions. The comparisons show that the normalized radar cross sections calculated based on Romeiser spectrum agree better with CMOD5 in some specific cases. The works presented in this paper will be helpful for applications of C band microwave radars in ocean observations.
ISSN:2153-7003
DOI:10.1109/IGARSS.2018.8518029