Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths

The Doppler scatterometer is a new style of remote sensing tool that can provide current measurements over a wide swath for rapid global coverage. The existing current estimation method for Doppler scatterometry uses the maximum likelihood method to jointly derive the wind and current fields but sho...

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Autores principales:	Weifeng Sun, Qing Wang, Weimin Huang, Chenqing Fan, Yongshou Dai
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	vector current velocity inversion Doppler scatterometer optimal selection of observation azimuths Science Q
Acceso en línea:	https://doaj.org/article/2843799f22aa423eb21fae9fbfc29447
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spelling	oai:doaj.org-article:2843799f22aa423eb21fae9fbfc294472021-11-11T18:52:03ZVector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths10.3390/rs132142632072-4292https://doaj.org/article/2843799f22aa423eb21fae9fbfc294472021-10-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4263https://doaj.org/toc/2072-4292The Doppler scatterometer is a new style of remote sensing tool that can provide current measurements over a wide swath for rapid global coverage. The existing current estimation method for Doppler scatterometry uses the maximum likelihood method to jointly derive the wind and current fields but shows high computational complexity. Moreover, the current radial speeds measured along two arbitrary observation azimuths are used to derive the vector current according to the parallelogram rule, which is not applicable for the case where two observation azimuths are not perpendicular. In this paper, a vector current velocity inversion method using an optimally selected observation azimuth combination—as well as a general current velocity calculation method—is proposed for Doppler scatterometry. Firstly, current radial speeds along several different observation azimuths are estimated using an interferometric phase difference matching method with low computational complexity. Then, two current radial components of each point are arbitrarily selected to estimate a preliminary current direction using the proposed vector current velocity derivation method. Finally, two observation azimuths that have the smallest intersection angles with the preliminarily estimated current direction are selected for vector current velocity determination. With the Ocean Surface Current Analyses Real-time (OSCAR) data as current input, vector current estimation experiments were conducted based on simulation analysis using an instrument conceptual design model for a pencil-beam scatterometer. The results show that the standard deviation of the estimated current velocity magnitude is 0.06 m/s. Compared with the reported results obtained by the existing method, the inversion accuracy of velocity magnitude is improved by 67%.Weifeng SunQing WangWeimin HuangChenqing FanYongshou DaiMDPI AGarticlevector current velocity inversionDoppler scatterometeroptimal selection of observation azimuthsScienceQENRemote Sensing, Vol 13, Iss 4263, p 4263 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	vector current velocity inversion Doppler scatterometer optimal selection of observation azimuths Science Q
spellingShingle	vector current velocity inversion Doppler scatterometer optimal selection of observation azimuths Science Q Weifeng Sun Qing Wang Weimin Huang Chenqing Fan Yongshou Dai Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths
description	The Doppler scatterometer is a new style of remote sensing tool that can provide current measurements over a wide swath for rapid global coverage. The existing current estimation method for Doppler scatterometry uses the maximum likelihood method to jointly derive the wind and current fields but shows high computational complexity. Moreover, the current radial speeds measured along two arbitrary observation azimuths are used to derive the vector current according to the parallelogram rule, which is not applicable for the case where two observation azimuths are not perpendicular. In this paper, a vector current velocity inversion method using an optimally selected observation azimuth combination—as well as a general current velocity calculation method—is proposed for Doppler scatterometry. Firstly, current radial speeds along several different observation azimuths are estimated using an interferometric phase difference matching method with low computational complexity. Then, two current radial components of each point are arbitrarily selected to estimate a preliminary current direction using the proposed vector current velocity derivation method. Finally, two observation azimuths that have the smallest intersection angles with the preliminarily estimated current direction are selected for vector current velocity determination. With the Ocean Surface Current Analyses Real-time (OSCAR) data as current input, vector current estimation experiments were conducted based on simulation analysis using an instrument conceptual design model for a pencil-beam scatterometer. The results show that the standard deviation of the estimated current velocity magnitude is 0.06 m/s. Compared with the reported results obtained by the existing method, the inversion accuracy of velocity magnitude is improved by 67%.
format	article
author	Weifeng Sun Qing Wang Weimin Huang Chenqing Fan Yongshou Dai
author_facet	Weifeng Sun Qing Wang Weimin Huang Chenqing Fan Yongshou Dai
author_sort	Weifeng Sun
title	Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths
title_short	Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths
title_full	Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths
title_fullStr	Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths
title_full_unstemmed	Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths
title_sort	vector current measurement using doppler scatterometry with optimally selected observation azimuths
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2843799f22aa423eb21fae9fbfc29447
work_keys_str_mv	AT weifengsun vectorcurrentmeasurementusingdopplerscatterometrywithoptimallyselectedobservationazimuths AT qingwang vectorcurrentmeasurementusingdopplerscatterometrywithoptimallyselectedobservationazimuths AT weiminhuang vectorcurrentmeasurementusingdopplerscatterometrywithoptimallyselectedobservationazimuths AT chenqingfan vectorcurrentmeasurementusingdopplerscatterometrywithoptimallyselectedobservationazimuths AT yongshoudai vectorcurrentmeasurementusingdopplerscatterometrywithoptimallyselectedobservationazimuths
_version_	1718431691971756032

Vector Current Measurement Using Doppler Scatterometry with Optimally Selected Observation Azimuths

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