从非扩散环境噪声互相关中提取确定性走时的精度。

Accuracy of the deterministic travel time retrieval from cross-correlations of non-diffuse ambient noise.

机构信息

CIRES, University of Colorado, NOAA/Earth System Research Laboratory, DSRC, Mail Code R/PSD, 325 Broadway, Boulder, Colorado 80305-3328, USA.

出版信息

J Acoust Soc Am. 2009 Dec;126(6):EL183-9. doi: 10.1121/1.3258064.

DOI:10.1121/1.3258064

PMID:20000892

Abstract

Measurements of long-range cross-correlations of ambient noise underlie acoustic noise interferometry, a promising technique for passive remote sensing of the environment. Previously established simple, exact relations between deterministic Green's functions and the cross-correlation function of perfectly diffuse noise do not necessarily hold for noise fields in the ocean and atmosphere. Here, the method of a stationary phase is applied to study the information content of the cross-correlation function of non-diffuse noise and to quantify the accuracy of passive measurements of the acoustic travel times.

摘要

环境噪声的远程互相关测量是声学噪声干涉测量的基础，这是一种用于被动遥感环境的很有前途的技术。以前建立的确定性格林函数和完全扩散噪声的互相关函数之间的简单、精确关系，不一定适用于海洋和大气中的噪声场。在这里，应用相定点法研究非扩散噪声的互相关函数的信息量，并定量评估声传播时间的被动测量的准确性。