摘要
阐述了海底回波空间相关特性的基本原理,引入了Kirchhoff模型进行回波仿真并计算空间相关函数,分析了密度比、声速比、衰减系数、海底表面不平整性空间谱的谱系数和谱指数等底质参数对回波空间相关特性的影响。通过建立上述底质特性参数与沉积物平均粒径的φ值之间的表达式,得到了回波空间相关特性随沉积物平均粒径的变化趋势:随着φ值的增大,空间相关函数的主瓣宽度变窄。将仿真结果与2007年10月份采集的海试数据进行比较,发现在海底底质相同的情况下,二者的空间相关函数波形符合得较好。
The fundamental principle of the spatial correlation characteristics of sea-bottom backscattering is expounded. The Kirchhoff model is introduced to simulate sea-bottom backscattering and the spatial correlation is calculated. Some sediment characteristic parameters, such as the ratio of sediment mass density to water mass density, the ratio of sediment sound speed to water sound speed, the attenuation coefficient of sound waves, the strength and exponent of sea-bottom interface roughness spectrum, are considered while simulating and their influences on spatial correlation are analyzed. By establishing the expressions of the sediment characteristic parameters with the logarithmic sediment grain size, the changing tendency of the spatial correlation is obtained. The width of the major lobe of the spatial correlation narrows while the logarithmic sediment grain size increases. The comparisons between simulated data and in-situ data collected in October 2007 prove that their spatial correlation waveforms agree well under the same sediment characteristics.
出处
《声学学报》
EI
CSCD
北大核心
2009年第5期385-395,共11页
Acta Acustica
基金
国家863基金资助项目(2006AA09A313)
