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Robust Multipath Time-delay Estimation of Broadband Source Using a Vertical Line Array in Deep Water
IEEE Signal Processing Letters ( IF 3.9 ) Pub Date : 2020-01-01 , DOI: 10.1109/lsp.2019.2954979 Hui Li , Kunde Yang , Rui Duan
IEEE Signal Processing Letters ( IF 3.9 ) Pub Date : 2020-01-01 , DOI: 10.1109/lsp.2019.2954979 Hui Li , Kunde Yang , Rui Duan
A method based on delay-and-sum (DAS) of cross-correlation functions is proposed for multipath time-delay estimation of a broadband signal received by a vertical line array (VLA) in the reliable acoustic path (RAP) environment. The multipath arrivals are mainly concerned with the direct (D) and surface-reflected (SR) paths. Three types of multipath time-delays are obtained, namely, the average D-D time-delay and SR-SR time-delay between two adjacent hydrophones, and the D-SR time-delay at the first hydrophone. The proposed method has significant advantages for underwater applications. First, the D and SR arrivals are successfully separated from time-delay estimation point of view, outperforming the estimation of direction of arrival with conventional beamforming. Second, the estimations of the average D-D time-delay and SR-SR time-delay between two adjacent hydrophones occur at the diagonal line of the two-dimensional DAS outputs, facilitating the automatic detection and extraction of multipath time-delays. Third, the estimation is robust against noisy background noise due to the spatial accumulative effect. The method is applied to experimental data for explosive source at ∼17 km range and 300 m depth, where it is shown that simple, stable, and fairly accurate multipath time-delay estimation can be made.
中文翻译:
在深水中使用垂直线阵对宽带源进行鲁棒多径时延估计
提出了一种基于互相关函数的延迟与求和(DAS)的方法,用于可靠声路径(RAP)环境中垂直线阵列(VLA)接收的宽带信号的多路径时延估计。多径到达主要与直接 (D) 和表面反射 (SR) 路径有关。得到三种多径时延,即相邻两个水听器之间的平均DD时延和SR-SR时延,以及第一个水听器处的D-SR时延。所提出的方法对于水下应用具有显着优势。首先,从时延估计的角度来看,D 和 SR 到达成功地分离,优于传统波束成形的到达方向估计。第二,两个相邻水听器之间的平均DD时延和SR-SR时延的估计发生在二维DAS输出的对角线上,便于多径时延的自动检测和提取。第三,由于空间累积效应,估计对于嘈杂的背景噪声是稳健的。该方法应用于约 17 km 范围和 300 m 深度的爆炸源的实验数据,表明可以进行简单、稳定和相当准确的多径时延估计。
更新日期:2020-01-01
中文翻译:
在深水中使用垂直线阵对宽带源进行鲁棒多径时延估计
提出了一种基于互相关函数的延迟与求和(DAS)的方法,用于可靠声路径(RAP)环境中垂直线阵列(VLA)接收的宽带信号的多路径时延估计。多径到达主要与直接 (D) 和表面反射 (SR) 路径有关。得到三种多径时延,即相邻两个水听器之间的平均DD时延和SR-SR时延,以及第一个水听器处的D-SR时延。所提出的方法对于水下应用具有显着优势。首先,从时延估计的角度来看,D 和 SR 到达成功地分离,优于传统波束成形的到达方向估计。第二,两个相邻水听器之间的平均DD时延和SR-SR时延的估计发生在二维DAS输出的对角线上,便于多径时延的自动检测和提取。第三,由于空间累积效应,估计对于嘈杂的背景噪声是稳健的。该方法应用于约 17 km 范围和 300 m 深度的爆炸源的实验数据,表明可以进行简单、稳定和相当准确的多径时延估计。