Broadband interference of received pulse for single normal mode and solitary internal wave localization  

作　　者：PIAO Shengchun ZHANG Shizhao LIU Jiaqi LI Xiaoman IQBAL Kashif 

机构地区：[1] Acoustic Science and Technology Laboratory,Harbin Engineering University Harbin 150001 [2] Key Laboratory of Marine Information Acquisition and Security,Harbin Engineering University,Ministry of Industry and Information Technology Harbin 150001 [3] College of Underwater Acoustic Engineering,Harbin Engineering University Harbin 150001

出　　处：《Chinese Journal of Acoustics》2020年第2期151-163,共13页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(11234001,11474073);Fundamental Research Funds for the Central Universities(3514497)。

摘　　要：To analyze the solitary internal wave(SIW) influence on acoustic field interference pattern and thereby monitor SIW, for broadband pulse signal propagating through SIWs, we adopt a parabolic equation model, and simulate the variation of received single normal mode(SNM) pulse sequence with SIW position, and analyze the spatiotemporal interference characteristics and mechanism of the sequence. Based on the coupled mode theory, we derive the relationship between SIW position and interference striation slope(ISS). The relationship can monitor the SIW position precisely, with greatly improved precision and robustness compared with previous work. Furthermore, based on the SNM interference pattern periodicity in frequency, we also develop another method to estimate SIW range, with better real-time property than the first method. The SIW-normal mode interference relationship can be used for improving acoustic field localization in the presence of SIWs, which has great value for oceanology,marine engineering, marine military and so on. Besides, the relationship can be expanded to other detection for local variation, e.g., detecting metal flaw and locating dramatic variation in seabed topography.

关 键 词：PULSE mode wave 

分 类 号：TN912.3[电子电信—通信与信息系统]