| Ocean wave parameters retrieved directly from compact polarimetric SAR data |
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| 作者姓名： | Yu Liu Yijun He Biao Zhang |
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| 作者单位： | 1. School of Electronic and Information Engineering, Nanjing University of Information Science & Technology;2. School of Marine Science, Nanjing University of Information Science & Technology |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41620104003 and 42027805； |
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| 摘 要： | We aim to directly invert wave parameters by using the data of a compact polarimetric synthetic aperture radar(CP SAR) and validate the effectiveness of ocean wave parameter retrieval from the circular transmit/linear receive mode and π/4 compact polarimetric mode. Relevant data from the RADARSAT-2 fully polarimetric SAR on the C-band were used to obtain the compact polarimetric SAR images, and a polarimetric SAR wave retrieval algorithm was used to verify the sea surface wave measurements. Usin...
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Ocean wave parameters retrieved directly from compact polarimetric SAR data |
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| Yu Liu,Yijun He,Biao Zhang.Ocean wave parameters retrieved directly from compact polarimetric SAR data[J].Acta Oceanologica Sinica,2022,41(4):129-137. |
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| Authors: | Yu Liu Yijun He Biao Zhang |
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| Affiliation: | 1.School of Electronic and Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China2.School of Marine Science, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | We aim to directly invert wave parameters by using the data of a compact polarimetric synthetic aperture radar (CP SAR) and validate the effectiveness of ocean wave parameter retrieval from the circular transmit/linear receive mode and π/4 compact polarimetric mode. Relevant data from the RADARSAT-2 fully polarimetric SAR on the C-band were used to obtain the compact polarimetric SAR images, and a polarimetric SAR wave retrieval algorithm was used to verify the sea surface wave measurements. Using the data and algorithm, there is no need to estimate complex hydrodynamic modulation transfer functions, even at large radar incidence angles. First, the radar backscattering cross-sections and backscattering cross-section of the radar linearly polarized with any polarization orientation angle were calculated in the two compact polarimetric SAR modes. Then, the wave slopes along the azimuth direction and the range direction were calculated directly using CP SAR data. Finally, we obtained the slope spectrum of the wave from the estimated wave slopes along azimuth and range directions. The wave parameters extracted from the synthetic wave slope spectrum were compared with those obtained from buoy observations of the National Data Buoy Center, verifying a suitable agreement. |
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| Keywords: | RADARSAT-2 CP SAR wave parameters wave slope spectrum |
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