海军航空工程学院学报2016，Vol.31Issue(6)：607-613,7.DOI:10.7682/j.issn.1673-1522.2016.06.002
暂态信号形成的参量阵声场特性
Parametric Array's Acoustic Characteristics Generated by Transient Signal
摘要
Abstract
Transient parametric array technology was easy to obtain the low-frequency broadband signal,so it was widely used in many sonar system.In many theoretical model for describing nonlinear propagation of the sound waves,KZK equation can accurately describe the diffraction,absorption and nonlinear effect of the finite amplitude wave.Based on the time domain solution of the KZK equation,in this paper,the parametric array that generated by the common transient signals was analyzed.The theoretical study showed that the acoustic field characteristic of the transient signal parametric array was mainly related to the carrier wave and the rising edge of the signal envelope.The steeper of Gaussian envelope pulse rising edge,the larger of the low-frequency components amplitude at the same axial position,the higher of the energy conversion efficiency that with the same peak power.When the center frequency of the modulated carrier was consistent,the sound pressure amplitude of the transient parametric array obtained by the positive linear frequency modulation (LFM) was slightly higher than negative LFM signal.This paper could provide a theoretical guide for the selection of the radiation waveform of the transient signal parameter array.关键词
参量阵/暂态信号/KZK方程/高斯包络脉冲/线性调频载波Key words
parametric array/transient signals/KZK equation/Gaussian envelope pulse/LFM modulated carrier分类
信息技术与安全科学引用本文复制引用
李中政,石黎明,方尔正..暂态信号形成的参量阵声场特性[J].海军航空工程学院学报,2016,31(6):607-613,7.基金项目
国家自然科学基金青年科学基金资助项目(11204050) （11204050）
