Comparisons of composite radar backscattering model and sea surface radar backscatter from synthetic aperture radar, scatterometer and altimeter

Ye Xiaomin; Lin Mingsen; Song Qingtao; Liao Fei; Liang Chao; Zhou Xuan

doi:10.3969/j.issn.0253-4193.2019.07.011

Volume 41 Issue 7

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Ye Xiaomin，Lin Mingsen，Song Qingtao, et al. Comparisons of composite radar backscattering model and sea surface radar backscatter from synthetic aperture radar, scatterometer and altimeter[J]. Haiyang Xuebao，2019, 41(7)：123–135，doi:10.3969/j.issn.0253−4193.2019.07.011

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Comparisons of composite radar backscattering model and sea surface radar backscatter from synthetic aperture radar, scatterometer and altimeter

doi: 10.3969/j.issn.0253-4193.2019.07.011

Ye Xiaomin^{1, 2
,},
Lin Mingsen^{1, 2, 5},
Song Qingtao^{1, 2
,
,},
Liao Fei³,
Liang Chao^{1, 2},
Zhou Xuan⁴

1.
National Satellite Ocean Application Service, Beijing 100081, China
2.
Key Laboratory of Space Ocean Remote Sensing and Application, State Oceanic Administration, Beijing 100081, China
3.
Guangzhou Meteorology Observatory, Guangzhou 511430, China
4.
Mailbox 5111, Beijing 100094, China
5.
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technolog (Qingdao), Qingdao 266237, China

Received Date: 2017-04-24
Rev Recd Date: 2018-04-26

Available Online: 2021-04-21

Publish Date: 2019-07-25

Abstract

Abstract

Comparison with Geophysical Model Function (GMF) developed by methods of empirical statistics, ocean microwave scattering model works well at all microwave frequency. Composite radar backscattering model is comprised of Bragg scattering model and geometrical optics model. We calculated the normalized radar cross sections (NRCSs) from the composite scattering model by using the sea surface wind speeds and directions measured by buoys moored in the northern of South China Sea in the whole year of 2014, and then compared them with SAR on board RADARSAT-2 at C-band, microwave scatterometer on board HY-2A satellite (HSCAT) at Ku-band, respectively. The biases of comparison are (–0.22±1.88) dB ( for SAR), (0.33±2.71) dB (for HSCAT in VV polarization) and (–1.35±2.88) dB (for HSCAT in HH polarization), respectively. We also calculated the NRCSs from the model by using the sea surface wind speeds and directions measured by NDBC buoys in the time period from October 1, 2011 to September 30, 2014, and then compared them with radar altimeter on board Jason-2 and HY-2A both at Ku-band with the bias of (1.01±1.15) dB and (1.12±1.29) dB, respectively. Although the biases of NRCSs between space-borne sensors and composite scattering model in medium and normal incidence are different each other, the accuracies of their sea surface wind speed products are the same(i.e. the root mean square errors are all less than 1.71 m/s). The results show that we can simulate the sea surface radar NRCSs of satellite-borne SAR, microwave scatterometer, and altimeter by using the composite radar backscattering model, and the simulations are consistent with that of CMOD5, NSCAT-2 and the GMF of operational wind retrieval for altimeter. It also indicates that the composite radar backscattering model could be used in calibration and validation of microwave sensors and simulation of radar backscatter from sea surface.
- radar backscattering model,
- synthetic aperture radar,
- scatterometer,
- altimeter

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