Research on Near-field High-frequency Echo Strength Characteristics of Small Undersea Vehicle
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摘要: 针对小型水下航行器探测和识别的需求, 开展了小型水下航行器近场高频回声强度特性建模及仿真研究。利用板块元方法, 基于典型圆柱型航行器目标, 计算分析了小型航行器近场回声强度, 给出了小型航行器回声强度的空间分布特性。在此基础上, 开展了水池实验, 对比分析了实验实测结果和仿真结果的一致性和变化特性, 结果表明仿真和水池实验结果在空间分布趋势上具有一致性, 小型航行器在头段端面方位和正横方位具有较强的回声强度, 小型航行器近场高频回声强度特性呈蝶形特征分布。
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关键词:
- 小型圆柱型水下航行器 /
- 近场声特性 /
- 高频声特性 /
- 回声强度特性
Abstract: In response to the need for detecting and identifying incoming small undersea vehicles, research has been conducted on modeling and simulating the high-frequency echo intensity characteristics of small undersea vehicle in the near field. This article uses the plate element method to calculate and analyze the near-field echo intensity of small undersea vehicle based on a cylindrical small undersea vehicle target, and presents the spatial distribution characteristics of the echo intensity of the small undersea vehicle target. On this basis, a pool test was conducted to compare and analyze the consistency and variation characteristics of the measured results and simulation results. The results showed that the simulation results and pool test results were consistent in spatial distribution trends, with strong echo intensity at the head end face and transverse azimuth of the small undersea vehicle target, and the high-frequency echo intensity characteristics of the small undersea vehicle near field exhibited a butterfly-like distribution. -
图 1 小型水下航行器模型及表面模型网格划分
Figure 1. Small undersea vehicle model and surface mesh division
图 2 航行器近距离回声强度仿真结果
Figure 2. Simulation results of echo intensity for undersea vehicle at close range
图 4 典型方位角和频率下测量直达波和目标回波
Figure 4. The measurement of direct wave and target echo at typical azimuth and frequency
图 5 模拟航行器回声强度随探测方位角变化趋势(探测频率
$ {f_1} $ )Figure 5. Simulated undersea vehicle echo intensity varying with detection azimuth angle (at detection frequency
$ {f_1} $ )
图 7 航行器回声强度仿真与实验结果
Figure 7. Simulation and experimental results of undersea vehicle target echo intensity
图 8 模拟航行器近场回声强度频率响应
Figure 8. Frequency responses of near-field echo intensity of simulated undersea vehicle
表 1 部分探测频率下部分方位角实验数据及计算结果
Table 1. Experimental data and calculation results of various azimuth angles at partial detection frequencies
探测方位角/(°) 直达波声程/m 目标回波声程/m 目标相对回声强度/dB $ {f_1} $ $ {f_3} $ $ {f_5} $ 时域分析法 频域分析法 时域分析法 频域分析法 时域分析法 频域分析法 0 1.67 3.67 6.827 6 7.175 8 7.127 0 7.330 2 6.866 5 7.456 1 30 0.90 2.24 −4.298 6 −4.006 2 −2.839 5 −2.703 8 −3.852 6 −3.245 9 45 0.92 2.10 −0.861 5 −0.686 2 1.475 3 1.827 8 1.464 8 2.015 7 60 0.60 3.15 −2.086 2 −1.978 6 1.664 5 2.000 9 1.893 8 2.203 0 75 0.839 2.97 7.247 7 7.609 4 5.584 4 5.609 2 3.726 9 3.865 5 90 0.83 2.92 6.033 9 6.073 3 5.845 4 5.985 6 5.025 0 4.584 9 120 0.60 3.68 6.463 3 6.784 5 −2.944 8 −4.115 8 0.176 2 −0.091 5 150 0.98 2.31 −1.132 7 −0.950 4 −6.522 3 −7.113 9 −6.910 4 −7.676 3 180 0.60 1.72 −6.277 9 −6.661 0 −2.269 3 −1.555 8 −3.768 0 −3.483 8 
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