Transmission of linearly frequency modulated pulses generates receptions at a vertical line array that can be cross correlated with the source signal to provide estimates of the oceanic waveguide impulse response. For short ranges, distinct path arrivals can be identified including the direct, surface reflection, bottom reflection, and sediment reflection. Accurate estimation of arrival times of such paths is tightly related to successful inversion for source location and water column depth and sound speed and, subsequently, estimation of sediment sound speed and thickness. To achieve accurate estimation, particle filtering is applied to the received time series at 16 phones combined with a simple cross-correlation method. Using linearization, arrival time probability density functions are connected to the geometry and water column sound-speed parameters, providing point estimates as well as probability densities. These are then employed in sediment sound speed and thickness estimation. The results, obtained from the application of the method to data collected during the Seabed Characterization Experiment, are consistent with prior information on the site.

中文翻译：

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多径宽带定位、水深测量和沉积物反演

线性调频脉冲的传输在垂直线阵列处产生接收信号，该信号可以与源信号互相关以提供海洋波导脉冲响应的估计值。对于短距离，可以识别不同的路径到达，包括直接、表面反射、底部反射和沉积物反射。准确估计这些路径的到达时间与成功反演源位置、水体深度和声速以及随后对沉积物声速和厚度的估计密切相关。为了实现准确的估计，粒子滤波应用于 16 个音素的接收时间序列，并结合简单的互相关方法。使用线性化，到达时间概率密度函数连接到几何和水柱声速参数，提供点估计以及概率密度。然后将这些用于沉积物声速和厚度估计。将该方法应用于海底表征实验期间收集的数据所获得的结果与现场的先前信息一致。