Parallel computation method for scattering subarea of sea surface containing breakers and foams under radar beam
A parallel computing and radar beam technology, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, radio wave measurement system, etc., can solve problems such as inaccurate calculation results and low calculation efficiency
Active Publication Date: 2018-10-19
XIDIAN UNIV
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Problems solved by technology
[0004] At present, there is no method that can adopt different methods for different regions, consider the influence of different factors, and use parallel technology to accelerate calculations. The existing methods have problems of low calculation efficiency and inaccurate calculation results.
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[0020] Below in conjunction with example the present invention is further described.
[0021] refer to figure 1 with figure 2 , the specific implementation steps of the present invention are as follows:
[0022] Step 1, establish a multi-scale nonlinear sea surface model, the number of bins is M×N, and obtain the slope of the sea surface height fluctuation along the wind direction, so as to obtain the probability density distribution function of the slope along the wind direction. The coverage of dynamic foam and static foam is obtained according to the following formula
[0023]
[0024] Among them, a=5 for dynamic foam, a=0.8 for static foam, Λ(c,u 10 ) is the average length of the breaking wave per unit area and unit velocity interval, g is the gravitational acceleration, u 10 is the wind speed at 10m above the sea surface, and c represents the wave speed.
[0025] According to the following formula, the coverage thickness of dynamic foam and static foam at differe...
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The invention discloses a parallel computation method for a scattering subarea of a sea surface containing breakers and foams under a radar beam. The method includes the following steps: establishinga three-dimensional electrically large size non-linear sea surface composite model containing the breakers and the foams; performing a first-level sub-beam splitting partition on a radar main beam, and performing angular spectrum expansion on the sub-beam; performing second-level partition on the sea surface without the foams, and establishing a scattering coefficient model of a determinacy surface; performing the second-level partition on the sea surface containing static foams, and establishing a deterministic body surface scattering coefficient model; performing the second-level partition on the breakers containing dynamic foams, and establishing a deterministic breaker and foam body surface scattering coefficient model; and separately performing parallel computation on dual partition by utilizing CUDA, and obtaining a total scattering coefficient by non-coherent superposition of scattering coefficients. Advantages of the method are that partition is performed on the sea surface containing the breakers and the foams by utilizing beam decomposition under radar beam irradiation, and a method, that the scattering characteristic of the electrically large size non-linear sea surfacecontaining the breakers and the foams can be accurately and effectively calculated by utilizing the combination of angular spectrum expansion and corresponding high-frequency algorithm, is provided.
Description
technical field [0001] The invention relates to a method for parallel calculation of sea surface scattering partitions containing broken waves and foams under a radar beam. By using beam decomposition and angular spectrum expansion, the sea surface structure can be partitioned under complex sea states and sea conditions including surges, foams, and broken waves. Combined with different algorithms for parallel processing, the calculation efficiency can be effectively improved. Background technique [0002] The research on the characteristics of sea clutter under small grazing angles has always been a hot issue in the fields of military detection and civilian remote sensing. However, when the radar beam is incident at a small grazing angle, a huge irradiation area will be formed on the sea surface, making physical analysis and mathematical solution become Very complicated. A huge irradiation area often contains a variety of sea states and sea conditions. There may be both ord...
Claims
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IPC IPC(8): G01S13/00
CPCG01S13/006
Inventor 张肖肖
Owner XIDIAN UNIV