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, 开展其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, 计算分析了其近场回声强度, 给出了回声强度空间分布特性。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, 小型水下航行器在头段端面方位和正横方位具有较强的回声强度, 小型水下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 small undersea vehicles, modeling and simulation research have been conducted on the high-frequency echo strength characteristics of small undersea vehicles in the near field. This article used the plate element method to calculate and analyze the near-field echo strength of a cylindrical undersea vehicle and presented the spatial distribution characteristics of the echo strength. On this basis, a pool test was conducted to compare the consistency and variation characteristics of the measured results and simulation results. The results show that the simulation results and pool test results are consistent in spatial distribution trends, with strong echo strength at the head end face and transverse azimuth of the small undersea vehicle, and the high-frequency echo strength characteristics of the small undersea vehicle in the near field exhibits a butterfly-like distribution. -
图 2 小型水下航行器近距离回声强度仿真结果
Figure 2. Simulation results of echo strength for small undersea vehicle at close range
图 4 典型方位角和频率下直达波和目标回波
Figure 4. 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. Echo strength of simulated undersea vehicle 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 echo strength
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 strength of simulated undersea vehicle
表 1 部分探测频率下不同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 1.670 3.67 6.827 6 7.175 8 7.127 0 7.330 2 6.866 5 7.456 1 30 0.900 2.24 −4.298 6 −4.006 2 −2.839 5 −2.703 8 −3.852 6 −3.245 9 45 0.920 2.10 −0.861 5 −0.686 2 1.475 3 1.827 8 1.464 8 2.015 7 60 0.600 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 0.830 2.92 6.033 9 6.073 3 5.845 4 5.985 6 5.025 0 4.584 9 120 0.600 3.68 6.463 3 6.784 5 −2.944 8 −4.115 8 0.176 2 −0.091 5 150 0.980 2.31 −1.132 7 −0.950 4 −6.522 3 −7.113 9 −6.910 4 −7.676 3 180 0.600 1.72 −6.277 9 −6.661 0 −2.269 3 −1.555 8 −3.768 0 −3.483 8 
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