A new method for ocean spectrum extraction from high-frequency second-order Doppler radar data

Since the observation of Crombie in [1], of Bragg peaks in high-frequency radar Doppler data, the extraction of ocean wave parameters from such data has become a topic of extensive research. In this paper, we propose a new method for the extraction of the ocean wave spectrum from high-frequency second-order Doppler radar data. The basis of the proposed method is to perform a change-of-coordinates to the more natural coordinate system (y, y'), where y is the square-root of K, the normalized first ocean wavenumber, and y' is similarly defined for the second scattering event. This simplifies the double-integral to the sum of a single spatially-dependent convolution and correlation, from which the ocean spectrum can be extracted using a simple optimization scheme. Good results are shown on synthetic HF-radar Doppler data.