东南大学学报（英文版）Issue(3)：235-241,7.DOI:10.3969/j.issn.1003-7985.2013.03.002
基于修正模式闪烁指数的水声窄带信号幅度波动模型
Models for amplitude fluctuation of underwater acoustic narrow band signal based on modified modal scintillation index
摘要
Abstract
A self-normalized statistic the modified modal scintillation index MMSI is proposed and defined as the variance of the modulus of modal excitation normalized by the square of its expected value over some observation intervals.It is proved in an analytical form that the MMSI is a depth dependent signature and independent of the source level and the source range under the condition of the ideal waveguide while the classical modal scintillation index MSI depends on both the source level and the source range.The MSI and the MMSI in the Pekeris waveguide at 70 Hz are simulated with different source levels and source ranges by the Kraken normal mode model.The simulation results are consistent with the theoretical deduction.The MMSI probability density functions PDFs of different normal modes for surface and submerged sources are calculated using the mode filtering methods with the same variations of vertical motions.It is indicated that the PDFs can be used to separate the submerged and the surface sources except for the fourth mode.关键词
修正模式闪烁指数/幅度波动/简正波模式过滤/Pekeris波导Key words
modified modal scintillation index/amplitude fluctuation/mode filtering/Pekeris waveguide分类
数理科学引用本文复制引用
安良,方世良,陈励军..基于修正模式闪烁指数的水声窄带信号幅度波动模型[J].东南大学学报（英文版）,2013,(3):235-241,7.基金项目
The National Natural Science Foundation of China(No．11104029)． （No．11104029）
