Simulation of X-band Radar Sea Clutter Based on Different Wave Spectrum Models

In order to meet the huge demand for experimental data in oceanographic studies and wave parameter acquisition, this paper studies the sea clutter simulation of X-band radar system based on different wave spectrum models. In this study, firstly, the Pierson-Moscowitz (PM) wave spectrum and Internati...

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Bibliographic Details
Main Authors: Liu, Meichen, Luo, Feng, Peng, Enchao, Sun, Daozhong
Format: Conference Proceeding
Language:English
Subjects:
Fitting
Modulation
Radar clutter
Radar imaging
Sea state
Sea surface
Surface waves
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Summary:In order to meet the huge demand for experimental data in oceanographic studies and wave parameter acquisition, this paper studies the sea clutter simulation of X-band radar system based on different wave spectrum models. In this study, firstly, the Pierson-Moscowitz (PM) wave spectrum and International Towing Tank Conference (ITTC) wave spectrum are used to generate sea surfaces from dynamic marine environment. Secondly, the real wave spectrum is retrieved from the real sea clutter data acquired by X-band radar as a reference. And finally the wave spectrum model that fits the real wave spectrum better is determined based on the fitting differences. By combining wave spectrum like PM spectrum or ITTC spectrum with cosine squared direction distribution function, some sea surfaces are generated under different sea state conditions by the linear superposition method based on the directional wave spectra. And the wave image spectra are retrieved from sea clutter data of X-band radar by using three-dimensional fast Fourier transformation (3D FFT). The real wave spectrum is retrieved with wave dispersion relation as the bandpass filter and modulation transfer function (MTF) as the correction factor. The experimental results show that the wave spectrum model having a better agreement with the real wave spectrum is determined so that sea surfaces and sea clutter data can be generated based on various directional spectra. In our experiment, the ITTC spectrum does better than PM spectrum, with a fitting error of less than 0.06 between the former and real wave spectrum and a fitting error of over 0.23 between the latter and real wave spectrum. The method can provide sea clutter data for the research of ocean wave parameter inversion algorithm based on X-band radar.
ISSN:2831-5804
DOI:10.1109/PIERS62282.2024.10618093