摘要
水下弹性球壳回波特性的研究对水下目标特征提取和识别具有重要意义。利用弹性理论和分离变量法导出弹性球壳散射声场的Rayleigh简正级数解,得到其反向散射波形态函数。由形态函数计算了高斯脉冲入射到弹性球壳的回波波形,并建立了水下弹性球壳回波特性的数学模型。通过对弹性球壳形态函数和回波结构的仿真,分析比较了不同材料和不同厚度的弹性球壳形态函数和回波特性,并讨论了水下弹性球壳回波特性的影响因素。结果表明,水下弹性球壳的回波特性与球壳材料、球壳厚度和入射信号等因素有关。
Researching the echoes from underwater elastic spherical shell is of great importance to the feature extraction and identification of underwater target.In this paper the Rayleigh normal mode solution was derived by using elastic theory and separation of variables,and then the backscattering form functions were obtained.When gauss pulses incident on elastic spherical shell,the echo waveforms were calculated.The model of the echo structures of underwater elastic spherical shell was founded.The backscattering form functions and the echo structures of different materials and shell thickness were simulated and compared with Matlab.Finally,the factors influencing the features of echoes were discussed.The simulation result shows that the features of echoes from underwater elastic spherical shell are related to the shell material,shell thickness,incident signal and so forth.
出处
《计算机仿真》
CSCD
2008年第9期16-19,61,共5页
Computer Simulation
基金
国防基金(9140A05010206HK0340)
关键词
弹性球壳
形态函数
回波特性
Elastic spherical shell
Form function
Feature of echo
