Experimental Study on Polarimetric Filtering in Ocean Radar

An ocean radar can retrieve information about surface currents and wave heights from the first- and second-order scattering caused by Bragg scattering. However, when the spectra of the first- and second-order scattering overlap with the signal from an aircraft target, accurately determining the first- and second-order scattering values becomes challenging. To effectively observe the ocean wave, it is necessary to suppress the aircraft target signal and to enhance the ocean wave signal. Conversely, for the multipurpose application of ocean radar, such as detecting moving targets like aircraft, the suppression of the ocean wave signal and enhancement of the aircraft target signal are required. This paper demonstrates, through experimental results, that polarimetric filtering can be applied in ocean radar to selectively enhance or suppress the desired signal.