Through the sensor estimation of sound speed profiles

被引:1
|
作者
Edelmann, Geoffrey F. [1 ]
Lingevitch, Joseph F. [1 ]
Gemba, Kay L. [2 ]
机构
[1] US Navy, Res Lab, Code 7160, Washington, DC 20375 USA
[2] US Navy, Dept Phys, Postgrad Sch, Monterey, CA 93940 USA
来源
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2024年 / 155卷 / 02期
关键词
WAVE-NUMBER ESTIMATION; SHALLOW-WATER; MATCHED-FIELD; INVERSION; ARRAY; ENVIRONMENT; EXTRACTION; LOCATION;
D O I
10.1121/10.0024976
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
A through-the-sensor method to sense the local sound speed profile (SSP) using measured acoustic wave numbers via an array of hydrophones is proposed. Ocean sounds can be treated as acoustic energy trapped as discrete modes within the water column. A Fredholm integral equation of the first kind relates the linearized (perturbative) sound speed corrections to the wave number differences between the measured values and those calculated from an acoustic kernel. Thus, a method to exploit environmental information deduced from different in situ sonar systems is proposed. Though this inversion can be unstable and non-unique, recent improvements in sparse inversions can lead to robust estimates even without an accurate starting SSP. An iterative algorithm using multiple acoustic frequencies is beneficial to achieve convergence and stability for larger sound speed corrections. This paper will compare broadband incoherent L-2- and coherent L-1-inversion results. Careful consideration must be made of the acoustic frequency, number of modes, a priori environmental information (e.g., water depth), and array length. The method will be first demonstrated on simulations and recordings from the Littoral Depth Discrimination Experiment 2012 (LIDDEX12) data set.
引用
收藏
页码:1534 / 1545
页数:12
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