Ambient noise cross correlation in free space: theoretical approach

J Acoust Soc Am. 2005 Jan;117(1):79-84. doi: 10.1121/1.1830673.


It has been experimentally demonstrated that the Green's function between two points could be recovered using the cross-correlation function of the ambient noise measured at these two points. This paper investigates the theory behind this result in the simple case of a homogeneous medium with attenuation.