Roux Philippe, Fink Mathias
Laboratoire Ondes et Acoustique, ESPCI, Université Paris VII, 10 rue Vauquelin, 75005 Paris, France.
J Acoust Soc Am. 2003 Mar;113(3):1406-16. doi: 10.1121/1.1542645.
This work provides a new way to measure the Green's function between two points in an acoustic channel without emitting a pulse by any of the two points. The Green's function between A and B is obtained from a set of secondary sources in the guide by averaging either the correlation or the convolution of the signals received in A and B. A theoretical approach based on mode propagation in a monochromatic regime is presented. Results are then extended to the time domain. Estimation of the Green's function is performed numerically in a range-independent and a range-dependent environment. Application to discreet acoustic communications is discussed.
这项工作提供了一种新方法，可在声学通道中两点之间测量格林函数，而无需这两点中的任何一点发射脉冲。A和B之间的格林函数是通过对波导中一组次级源接收的A和B处信号的相关性或卷积进行平均得到的。提出了一种基于单色 regime 中模式传播的理论方法。然后将结果扩展到时域。在与距离无关和与距离有关的环境中对格林函数进行数值估计。讨论了其在离散声学通信中的应用。
