物理学报2017，Vol.66Issue(9)：226-242,17.DOI:10.7498/aps.66.094302
一种基于模态匹配的浅海波导中宽带脉冲声源的被动测距方法
A passive range method of broadband impulse source based on matched-mode processing
摘要
Abstract
Aiming at the passive impulse wideband source range problem in shallow water waveguides, a passive source range method with single hydrophone based on the matched mode processing is presented in this paper, the method is applied to the shallow water waveguide with a bottom of liquid semi-infinite space. Warping transformation is a useful tool to separate the normal modes of the received signals of the impulse source, and the frequency domain signals of each order can be obtained. The seafloor phase shift parameter is an important parameter describing the acoustic parameters of the seafloor, which contains nearly all the information about sea floor, what is more, the seafloor phase shift parameter is also an parameter that can be obtained by some experimental data easily. Each order normal mode can be represented by the expression that contains the phase shift parameter of sea floor. What is more, the influence of sound speed profile of the waveguide on eigenvalue can be approximately eliminated by jointly processing arbitrary two-order normal modes. Sound speed profile has a similar influence on eigenvalue of each order normal mode, therefore, the difference in the eigenvalues between arbitrary two-order normal modes can be approximated represented by the phase shift parameter of the sea-floor, the sea depth and the mean speed in the waveguide. In this way, the phase replica which consists of the eigenvalue difference of each two-order mode can be calculated simply and quickly, and then by constructing cost function and matching normal mode, the underwater impulse source can be located. Compared with the traditional method of processing matched mode and the method of processing matched fields, the method presented in this paper has two advantages: using warping transformation instead of hydrophone arrays to separate the normal modes; the replica can be calculated quickly and easily, depending on a small number of environmental parameters of waveguide. The effectiveness and accuracy of the method are proved by the results of numerical simulation and sea experimental data processing, in which the signals are both received by a single hydrophone. The sea experimental data contain linear frequency modulation impulse source signal and explosion sound source signal, and the mean relative error of range estimation is less than 10%. In the end of this paper, the range estimation error is analyzed, indicating that the error originates mainly from the mode phase parts besides the phase part of Hankel function. Consequently, finding the ways to reduce the range estimation error is an important project in the future.关键词
浅海波导/海底相移参数/模态匹配/被动测距Key words
shallow water waveguide/phase shift parameter/matched mode/passive range引用本文复制引用
李晓曼,张明辉,张海刚,朴胜春,刘亚琴,周建波..一种基于模态匹配的浅海波导中宽带脉冲声源的被动测距方法[J].物理学报,2017,66(9):226-242,17.基金项目
国家自然科学基金(批准号: 11474073)和水声技术重点实验室开放基金(批准号: SSKF2015002)资助的课题.Project supported by the National Natural Science Foundation of China (Grant No. 11474073) and the Opening fund of Acoustics Sciences and Technology Laboratory, China (Grant No. SSKF2015002). （批准号: 11474073）
