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In this paper, a new method is proposed to estimate surface current using X-band nautical radar. This method is referred to as the Hybrid Least Squares (HLS) method. The HLS combines the existing Iterative Least Squares (ILS) and Normalized Scalar Product (NSP) methods. The HLS is designed to inherit the short ILS computational time and the high NSP reliability. For validation, the proposed method...
Scan conversion, as a re-sampling process, is expected to add non-wave components to the wave spectrum. Resampling processes involve applying a low-pass filter to retrieve the original image followed by sampling on the new Cartesian grid. Scan conversion is necessary for ocean wave spectrum estimation using the Cartesian Fourier Transform (CFT). The Polar Fourier Transform (PFT) was originally proposed...
The Polar Fourier Transform (PFT) can be used to estimate the ocean wave number spectrum from marine radar data. The main advantage of the PFT over the Cartesian Fourier Transform (CFT) is its direct applicability to the native radar data without the need for the intermediate stage of scan conversion. However, by definition, the PFT operates on positive, and not negative, wavenumbers. This leads to...
In marine radar remote sensing, scan conversion can be visualized as a process of re-sampling in which the original image is recovered and then sampled on a new grid. Recovering an image from its samples implies applying a low pass filter which would present some distortion in the wave spectrum. In this paper, a new approach to acquire the wave spectrum with minimal distortion is proposed. The basic...
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