Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.
J Acoust Soc Am. 2011 Apr;129(4):1825-36. doi: 10.1121/1.3552871.
A model is presented for the complete passive fathometer response to ocean surface noise, interfering discrete noise sources, and locally uncorrelated noise in an ideal waveguide. The leading order term of the ocean surface noise contribution produces the cross-correlation of vertical multipaths and yields the depth of sub-bottom reflectors. Discrete noise incident on the array via multipaths give multiple peaks in the fathometer response. These peaks may obscure the sub-bottom reflections but can be attenuated with use of minimum variance distortionless response (MVDR) steering vectors. The seabed critical angle introduces discontinuities in the spatial distribution of distant surface noise and may introduce spurious peaks in the passive fathometer response. These peaks can be attenuated by beamforming within a bandwidth limited by the array geometry and critical angle.
提出了一种模型，用于完整描述被动测深仪对海洋表面噪声、干扰离散噪声源以及理想波导中局部不相关噪声的响应。海洋表面噪声贡献的主导阶项产生了垂直多径的互相关，并给出了次底反射器的深度。通过多径进入阵列的离散噪声在测深仪响应中产生多个峰值。这些峰值可能会使次底反射模糊，但可以通过使用最小方差无失真响应 (MVDR) 导向矢量来衰减。海底临界角会在远距离表面噪声的空间分布中引入不连续性，并可能在被动测深仪响应中引入虚假峰值。这些峰值可以通过在由阵列几何形状和临界角限制的带宽内进行波束形成来衰减。
