Sparsity-based approach for ocean acoustic tomography using learned dictionaries

Online Time-Resolved Reconstruction Method for Acoustic Tomography System

“…For the 1 l regularisation, the general form is defined as: (2.23) where the regularisation matrix F can be the identity matrix(  F= ) as the sparsity regularisation, with priori knowledge that the target distribution of temperature and wind velocity has sparse representation using a specific model [4,60]. The commonly used are the sparsity regularisation ( F = I ) and…”

“…Acoustic tomography has proved to be an effective sensing technique for a variety of applications. Relevant cases include the large scale ocean currents [2][3][4][5], the seismic imaging of the geometrical properties of the subsurface at depth [6], medical ultrasound imaging for breast cancer detection [7][8][9][10][11], the non-destructive testing for tree decay detection [12] and stored grain deterioration detection [13].…”

“…In the past decades, acoustic tomography using TOF measurements has been continuously gaining interest in seismic imaging [6], medical ultrasound imaging [7][8][9][10][11], atmospheric imaging [17-19, 32, 34, 57, 58], ocean current monitoring [2][3][4] and many other areas [13,86]. Examples of the acoustic tomography applications and the corresponding operating frequency ranges are listed in Table 2-4.…”

Marine information gathering, transmission, processing, and \\fusion: current status and future trends

“…中国科学 : 信息科学 第 46 卷 第 期 例如, 菲律宾海声层析研究锋面、中尺度涡时空变化规律的声学监测方法, 试验中首次引入了水下滑 翔器作为移动声学节点, 同时结合声层析数据和潜标等海洋动力环境测量及海洋模型作同化, 给出该 海区海洋中尺度过程时空特性, 及对深海声传播的影响等 [104] . 采用现代信息理论的方法 (如压缩传 感 [105] ) 来指导声层析的研究, 将会是值得开展的工作. [106] .…”

Estimation of range‐dependent sound‐speed profile with dictionary learning method

“…However, it is impractical to monitor the SSP with such devices in a vast area over long time period [5, 6]. Alternative methods include an acoustic inversion approach to monitor rapidly changing SSP [5], travel‐time data collected with an ocean acoustic tomography (OAT) technique [7] or matched field inversion [8–10].…”