Unusual pattern in S-1 GRD product

Dear All,
We are working on S-1 GRD product for change detection in surface area of water bodies which is further linked to a hydrological process. My question is related to a certain GRD image of 11 July 2016 (S1A_IW_GRDH_1SDV_20160711T093133_20160711T093202_012099_012BA5_598A) taken over south Korea which covers the location of 37.37368007 N, 127.8258358 E, the image has light blue color pattern as one can see in the preview section of ESA data hub in the attached figure, I am wondering what could be the reason for this anomaly


Looks like RadioFrequency Interference (RFI) from probably maritime radars.

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