Frequency invariability of acoustic field and passive source range estimation in shallow water

• Published in: Science China. Physics, mechanics & astronomy Vol. 57; no. 2; pp. 225 - 232
• Main Authors: Zhou, ShiHong, Qi, YuBo, Ren, Yun
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-02-2014; Springer Nature B.V
• Subjects: Astronomy; Autocorrelation functions; Classical and Continuum Physics; Hydrophones; Observations and Techniques; Physics; Physics and Astronomy; Shallow water; Sound fields; Thermocline; 估计; 函数变换; 变性; 声场; 浅水环境; 自相关函数; 被动源; 频率; autocorrelation function; passive range estimation; warping transform; frequency invariability; single hydrophone
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-013-5359-z

The frequency invariability of the warped modal signal and the warped signal autocorrelation function in shallow water is dis- cussed. A method is proposed for passive source-range estimation based on the frequency invariability and warping transform of signal autocorrelation function received by a single hydrophone in a range-independent or weak range-dependent shallow water environment. In the method, a guided source with a known range is employed to provide the crucial and relative invari- ant scaled features. The experimental data in shallow water with an iso-speed profile and a fluctuated thermocline are used to verify this approach. The relative errors of the source range estimation are basically less than 10%.