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Number Simulation of Getting Wave Information Based on X-band Radar

Author: SongLiNa
Tutor: WangJian;DongShunLe
School: Ocean University of China
Course: Condensed Matter Physics
Keywords: Sea Clutter X-band radar Shadow modulation Tilt modulation
CLC: P731.2
Type: Master's thesis
Year: 2009
Downloads: 42
Quote: 0
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Abstract


Ocean, accounting for about two-thirds of the area of ??the Earth, and is closely related to human life. The ocean contains all kinds of resources, not only where marine life can provide rich protein for human simultaneous storage of all kinds of mineral resources and energy also immeasurable. In addition, marine environmental change has a direct impact on the global climate, especially waves, storm surges, tsunamis and other natural phenomena, can easily result in the coastal zone of various disasters, causing huge economic losses in coastal areas. With the advancement of technology and social human development, grasp and predict ocean waves flow information has become a pressing topics. Waves information extracted various methods, the use of X-band radar sea level information extraction the economic weather advantages favored Beishou researchers because of its convenience,. Although the the sea clutter imaging mechanism has yet to be finalized, but already has a mature sea clutter imaging theory, as well as \Depth understanding of the imaging mechanism of sea clutter and realize the whole inversion process, the experimental data is very important. Through numerical simulation can not only before the start of the experiment, explore inversion algorithm, but also by a large number of simulation results contrast, targeted aid understanding of the imaging mechanism of sea clutter, improve and perfect inversion algorithm also provide a reasonable basis for the choice of types of parameters required by the inversion. This paper describes the numerical simulation of the process throughout. First, based on the linear wave theory PM spectrum, the main wave direction, the main wave frequency, the average cycle waves field related to wave height simulation. The simulated region-wide 2550 * 2550m ~ 2. x, y-direction of the radial resolution was 10m. Wave spectrum of different parameters, respectively, a total of 32 consecutive 80s sea wave height time series. Secondly simulated time series of images of the sea clutter. In the X-band radar sea in the imaging process, the long-wave through the shadows modulation, tilt modulation, hydrodynamic modulation, orbital modulation, such as the role of the modulated Bragg shortwave imaging radar screen. The shadow modulation and tilt modulation plays a major role in this paper based on the two modulation, the previous Wave Height image into the image of the sea clutter fully considered in the process of converting the X-band radar blind spot and then they have to carry out inversion algorithms and other factors, changing the radar set the height of a series of sea clutter image. Finally, the time series of simulated sea clutter image inversion. This requires the three-dimensional Fourier transform, and then after filtering, integration, the modulation transfer function, and a series of inversion role wave spectrum, and calculates the direction of the main wave of the main wave frequency parameter. By inversion of the resulting parameters and input parameters matching to prove the role of various modulation of the sea clutter in the imaging process, and also proved the scientific nature of this inversion algorithm.

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine hydrology > Ocean dynamics
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