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首页> 外文期刊>The Journal of the Acoustical Society of America >Coherence and interference in diffuse noise: On the information and statistics associated with spatial wave correlations in directional noise fields
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Coherence and interference in diffuse noise: On the information and statistics associated with spatial wave correlations in directional noise fields

机译：散射噪声中的相干和干扰：关于方向性噪声场中与空间波相关性相关的信息和统计信息

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摘要

Broadband noise correlation methods for the passive extraction of information about the propagation of waves between distant sensor locations have received considerable attention in the literature. For the case of an isotropic ambient field distribution, there is a well-defined relationship between the expectation value of the wave coherence over the sensors and point-to-point wave propagation. Experimental applications, however, must contend with ambient field anisotropy as well as the performance limitations associated with stochastic fluctuations. This paper explores the influence of ambient field directionality on both (1) the connection between the measured wave coherence and sensor-to-sensor propagation and on (2) the rate at which measurements stochastically converge to the expectation value of the underlying wave coherence. Due to diffraction, the relationship between the measured wave coherence and sensor-to-sensor propagation is shown to be robust to even highly directional ambient field features. While the fluctuations of a stochastic system are generally known to depend on bandwidth and measurement duration, the rate of stochastic convergence depends additionally on the cross-spectral power density (coherent power) relative to the power-spectral density (total incident power). Practical experimental implications of these results are discussed.
机译：用于被动提取有关远距离传感器位置之间的波传播的信息的宽带噪声相关方法在文献中已引起相当大的关注。对于各向同性的环境场分布，传感器上的波相干的期望值与点对点波传播之间存在明确定义的关系。然而，实验应用必须应对环境场各向异性以及与随机波动相关的性能限制。本文探讨了环境场方向性对（1）被测波相干性与传感器到传感器传播之间的联系以及（2）测量值随机收敛至基础波相干性期望值的速率的影响。由于衍射，所测量的波相干性与传感器之间的传播之间的关系显示出即使对于高度定向的环境场特征也很稳健。虽然通常已知随机系统的波动取决于带宽和测量持续时间，但是随机收敛的速率还取决于相对于功率谱密度（总入射功率）的互谱功率密度（相干功率）。讨论了这些结果的实际实验意义。

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