Ms. Jing Wang Profile

Jing Wang

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Proceedings Article | 14 October 2019 Presentation + Paper

Evaluating ocean wave spectra derived from quad-polarized GF-3 wave mode SAR images against buoys

He Wang, Jing Wang, Biao Zhang, Jianhua Zhu

Proceedings Volume 11150, 111500G (2019) https://doi.org/10.1117/12.2532683

KEYWORDS: Synthetic aperture radar, Satellites, Wave propagation, Radar, Polarization, Data acquisition, Error analysis, Modeling, Modulation transfer functions, Sensors

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In 2016, the first Chinese synthetic aperture radar (SAR), the Gaofen-3 (GF-3) satellite, was launched. Unlike the single-polarized wave mode SARs in Europe, GF-3 is the first satellite acquiring the quad-polarized SAR data in wave mode configuration, which could benefit the ocean wave estimation. Here, the ocean wave spectra estimation from quad-polarized GF-3 wave mode is presented and its performances are evaluated. For the period from January to October in 2017, the ocean wave spectra were inverted from GF-3 wave mode data. The quad-polarized SAR-ocean spectra inversion scheme was utilized, in which the azimuthal and range wave slopes are obtained from the vertically and linearly polarized normalized radar cross sections and then converted to ocean wave slope spectra. The validation was also performed through comparisons against directional wave buoy observations. The spatio-temporal criteria of 100 km and 0.5 h, yield 87 matchups. Two representative cases illustrate the consistency between the GF-3 SAR ocean wave spectra and buoy measurements. Statistical assessment shows the root mean square error (RMSE) of 0.35 m, 19.52 m and 24.89° for the significant wave height, peak wavelength and wave direction, respectively. Evaluation results indicate that the quad-polarized algorithm is suitable for spectral ocean wave estimation from GF-3 wave mode, and encouraging for operational implementation.

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