戚乐华,刘保华,阚光明

• 1:中国海洋大学海洋地球科学学院
• 2:自然资源部第一海洋研究所海洋沉积与环境地质重点实验室
• 3:青岛海洋科学与技术试点国家实验室

摘要(Abstract)：

不同粗糙散射理论由于均采用了一定的近似方法,只在特定条件下才具有较好的预测准确性。本文采用PM海浪谱模型,利用积分方程法研究了几种常用粗糙散射理论对海面中频1～20 kHz后向声散射的有效性。仿真结果表明,中频频段相干散射一般远低于非相干散射,平均低约20 dB。四阶小粗糙微扰近似和小斜率近似的预测准确性最好,在频率15 kHz风速小于10 m/s的情况下,24°以上中高掠射角范围的小斜率近似和9°～64°掠射角范围的四阶小粗糙微扰近似的预测误差不超过2 dB。二阶小粗糙微扰近似整体预测精度偏低,特别是在小于20°的小掠射角和大于60°的大掠射角范围。掠射角80°以上的近垂直入射时,小粗糙微扰理论的预测结果偏高,相反Kirchhoff近似只在近垂直入射时才具有较好的准确性,中小掠射角的预测结果偏高。海上测量结果也验证了上述结论。

关键词(KeyWords)： 海面声散射;粗糙散射理论;中频;有效性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41330965,41527809);; 泰山学者工程专项经费(20161007)资助~~

作者(Author): 戚乐华,刘保华,阚光明

DOI: 10.16441/j.cnki.hdxb.20200043

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