Parallel Computational Method for Scattering Partitions in Radar Beams Containing Broken Waves and Foamy Sea Surface
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 low calculation efficiency and inaccurate calculation results
Active Publication Date: 2021-08-10
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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Embodiment Construction
[0020] Below in conjunction with example the present invention is further described.
[0021] refer to figure 1 and 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 differen...
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A method for parallel calculation of scattering partitions on a sea surface containing broken waves and foam under a radar beam, comprising the steps of: establishing a three-dimensional composite model of a large-scale non-linear sea surface containing broken waves and foam; Carry out angular spectrum expansion; establish a deterministic surface scattering coefficient model for the second-level division of the sea surface without foam; establish a deterministic decent scattering coefficient model for the second-level division of the sea surface with static foam; Partitioning, establishing a deterministic breaking wave and foam surface scattering coefficient model; using CUDA to calculate the two partitions in parallel, and using the incoherent superposition of scattering coefficients to obtain the total scattering coefficient. The advantage is that the beam decomposition is used to partition the sea surface containing broken waves and foam under the irradiation of the radar beam, and the use of angular spectrum expansion combined with the corresponding high-frequency algorithm provides an accurate and effective calculation of the scattering characteristics of the electrically large-scale nonlinear sea surface containing broken waves and foam. Methods.
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