海洋波譜儀海浪探測(cè)機(jī)理及仿真研究
[Abstract]:Ocean wave spectrum is a kind of microwave sensor which is used to measure the directional spectrum of ocean waves. It works at a small incident angle and can be scanned by an antenna of 360 degrees. It can be used to observe the sea surface in a large area and for a long time, so as to obtain the wave direction spectrum, wind speed and high sea surface parameters. In this paper, the theoretical model of sea surface microwave scattering at small incident angle is analyzed, and the mechanism of ocean wave detection is studied, and the simulation of ocean wave spectrum detection by remote sensing of spaceborne ocean wave spectrometer is carried out. In order to retrieve wave spectrum and ocean wave parameters from measured data. In this paper, the relationship between wave spectrum and wave research is introduced, and the importance of wave spectrum detection is emphasized. Then the microwave scattering model, quasi-mirror scattering model, two-scale model and three-scale model of ocean wave with small incident angle are discussed. The quasi-mirror scattering model fails at a large incidence angle, and the two-scale and three-scale models can describe the sea surface scattering in the whole range of incident angles. Compared with these models, the three-scale results are closer to the measured values. In addition, the backscattering coefficient of the quasi-mirror scattering model is directly proportional to the probability density of the sea surface slope. The non-Gao Si slope probability density distribution, which takes into account the high-order statistical characteristics of the sea surface slope, can more accurately describe the actual sea surface. Make the scattering calculation more accurate. Then, the existing wave detection principles are analyzed, the main points of which are quasi-mirror scattering and long wave tilt modulation. Finally, a simulation platform for ocean wave spectrum detection with ocean wave spectrometer is built, and the performance of ocean wave spectrum inversion under different sea conditions is analyzed by using the simulation platform. The simulation results show that the wave spectrum can be inversed by the wave spectrometer when the wind speed is greater than 10m/s for the mature waves, while the waves under the lower wind speed can be detected for the immature wind waves and surges. The detection effect is also related to the effective wave height. The larger the effective wave height is, the better the inversion effect is.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:P716.22
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