【摘要】 水听器接收的运动目标宽带噪声的频率-时间I(ω,t)声场干涉结构图随着目标的运动会发生相应的变化。这个变化将引起I(ω,t)中干涉条纹的弯曲,使得I(ω,t)和频率-距离干涉结构图不再有简单的线性映射关系。在深入分析宽带噪声运动目标频率-时间I(ω,t)和相应频率-距离I(ω,r)声场干涉结构间的非线性映射关系的基础上,提出了一种从I(ω,t)到线性I(ω,r)的时空变换方法(Time-Space Linear Transformation,TSLT)。数值仿真实验结果表明,TSLT可以有效地消除目标运动的影响,从I(ω,t)中恢复出能真实反映频率-距离声场干涉结构规律的I(ω,r)。最后给出利用运动目标宽带噪声声场干涉结构估计波导不变量的应用例。更多还原

【Abstract】 For moving sources,the frequency-time interference pattern of the acoustic field of broadband noise sources received by hydrophone may change somehow.The change will cause the frequency-time interference pattern’s bending,which makes the transformation of acoustic intensity interference patterns from frequency-time to fre-quency-range be no longer a simple linear mapping relation.In this paper,the nonlinear mapping relation for acoustic intensity interference patterns of broadband noise of moving sources from frequency-time to frequency-range is analyzed,and a time-space transformation method of acoustic intensity interference patterns from frequency-time to frequency-range is proposed.The results of simulation show that the time-space transformation can decrease the impact of noisy motions and can recover the true acoustic intensity interference patterns from frequency-time to fre-quency-range.Finally,an example of using the interference pattern of the acoustic field of broadband noise sources to estimate waveguide invariant is given.更多还原