13 October 2008 Retrieval of shallow water topography surface currents from SAR image
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Abstract
A new method for retrieving shallow water topography surface currents from SAR image is introduced based on the shallow water topography SAR imaging mechanism. M4S was applied to forward simulate radar signatures of the oceanic features over the ocean surface. The first guessed surface currents can be estimated from the normalized radar cross section (NRCS) of the shallow water topography profile in the SAR image according to the AH linear theory, the NRCS induced by the varying shallow water topography surface currents could be simulated by the forward simulating model. The wind speed and shallow water topography surface currents gradients are modified using the iterative method for the simulated radar signals close to the NRCS calculated from SAR image. Finally, the wind speed and the surface currents can be retrieved. This method is tested on an ERS-2 SAR image in the Taiwan Shoal. The result shows that the simulated shallow water topography radar signal is consistent with the NRCS measured from SAR image, and their correlation coefficient is up to 90%, which means that this method is convergent and applicable.
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Bin Fu, Weigen Huang, Kaiguo Fan, Xilin Gan, Huaguo Zhang, and Aiqin Shi "Retrieval of shallow water topography surface currents from SAR image", Proc. SPIE 7105, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2008, 71050X (13 October 2008); doi: 10.1117/12.800040; https://doi.org/10.1117/12.800040
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