Dosso Stan E
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada.
J Acoust Soc Am. 2014 Jan;135(1):124-33. doi: 10.1121/1.4835835.
This paper presents an approach to three-dimensional (3D) localization of ocean acoustic sources using a single three-component geophone on Arctic sea ice. Source bearing is estimated by maximizing the radial signal power as a function of horizontal look angle, applying seismic polarization filters to suppress shear waves with transverse particle motion. The inherent 180° ambiguity is resolved by requiring outgoing (prograde) particle motion in the radial-vertical plane. Source range and depth estimates and uncertainties are computed by Bayesian inversion of arrival-time differences of the water-borne acoustic wave and ice seismic waves, including the horizontally-polarized shear wave and longitudinal plate wave. The 3D localization is applied to geophone recordings of impulsive sources deployed in the water column at a series of ranges (200 to 1000 m) and bearings (0° to 90°) for three sites in the Lincoln Sea characterized by smooth annual ice, rough/ridged annual ice, and thick multi-year ice. Good bearing estimates are obtained in all cases. Range-depth localization is successful for ranges over which ice seismic arrivals could be reliably detected, approximately 200 m on rough ice, 500 m on smooth ice, and 800 m on multi-year ice. Effects of environmental uncertainty on localization are quantified by marginalizing over unknown environmental parameters.
本文提出了一种利用北极海冰上的单个三分量检波器对海洋声源进行三维（3D）定位的方法。通过将径向信号功率作为水平视角度的函数最大化来估计声源方位，应用地震极化滤波器抑制具有横向质点运动的剪切波。通过要求在径向垂直平面内的外向（顺行）质点运动来解决固有的180°模糊性。通过对水波和冰地震波（包括水平极化剪切波和纵向板波）到达时间差的贝叶斯反演来计算声源距离和深度估计值及不确定性。将这种三维定位方法应用于林肯海三个地点的一系列距离（200至1000米）和方位（0°至90°）处水柱中部署的脉冲声源的检波器记录，这三个地点分别具有光滑的年冰、粗糙/有脊的年冰和厚的多年冰。在所有情况下都获得了良好的方位估计。对于能够可靠检测到冰地震波到达的距离，距离-深度定位是成功的，在粗糙冰上约为200米，在光滑冰上约为500米，在多年冰上约为800米。通过对未知环境参数进行边缘化来量化环境不确定性对定位的影响。
