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Two-dimensional sea surface current field inversion based on SAR sub-aperture decomposition
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Jiahui Zhang1, Hongli Miao1, *, Zhonghao Yang1, Kunchi Liu1
Haiyang Xuebao | 2023, 45(8) : 24 - 30
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Haiyang Xuebao | 2023, 45(8): 24-30
• Article •
Two-dimensional sea surface current field inversion based on SAR sub-aperture decomposition
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Jiahui Zhang1, Hongli Miao1, *, Zhonghao Yang1, Kunchi Liu1
Affiliations
  • 1College of Physics and Optoelectronic Engineering, Faculty of Information Science Engineering, Ocean University of China, Qingdao 266100, China
Published: 2023-08-31 doi: 10.12284/hyxb2023094
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Two single-scene SAR images observed by Radarsat-2 and Sentinel-1A were decomposed to obtain a pair of SAR sub-aperture images at different azimuth-angles, respectively. Doppler centroid anomaly method was used to invert the sea surface current of two sub-aperture images with different azimuth angles. The current field was obtained by vector synthesis. The inversion results were verified by the HYCOM model data with spatio-temporal matching. The results show that the root mean square (RMS) of the current velocity between the synthesized result by two sub-aperture images of Radarsat-2 and the HYCOM model data is 0.09 m/s, and the correlation coefficient is 0.64. The RMS of current direction is 10.49° and the correlation coefficient is 0.78 of this group data. As for the results of the Sentinel-1A image, the RMS of the current velocity is 0.06 m/s, and the correlation coefficient is 0.82. The RMS of the current direction is 2.85°, and the correlation coefficient is 0.86. It can be seen that the two-dimensional ocean currents field can be effectively inverted based on the two sub-aperture SAR images that decomposed from single-scene SAR image. The inversion accuracy is related to the relative direction of the radar’s looking direction and the real current vector. The inversion accuracy of the sea surface current field can be higher when the relative angle is small.

SAR  /  sub-aperture  /  Doppler centroid anomaly  /  two-dimensional current field  /  HYCOM
Jiahui Zhang, Hongli Miao, Zhonghao Yang, Kunchi Liu. Two-dimensional sea surface current field inversion based on SAR sub-aperture decomposition[J]. Haiyang Xuebao, 2023 , 45 (8) : 24 -30 . DOI: 10.12284/hyxb2023094
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Year 2023 volume 45 Issue 8
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Article Info
doi: 10.12284/hyxb2023094
  • Receive Date：2022-12-30
  • Online Date：2025-12-28
  • Published：2023-08-31
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  • Received：2022-12-30
  • Revised：2023-03-23
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    1College of Physics and Optoelectronic Engineering, Faculty of Information Science Engineering, Ocean University of China, Qingdao 266100, China
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表12种不同金属材料的力学参数
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Number of
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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