水下对空中声源的运动参数估计  

Motion parameters estimation of airborne source from underwater

作　　者：刘凯悦 彭朝晖[1] 张灵珊 王光旭[1] LIU Kaiyue;PENG Zhaohui;ZHANG Lingshan;WANG Guangxu(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《应用声学》2020年第2期236-245,共10页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11674349)。

摘　　要：空中声源的辐射噪声谱包括宽带连续谱和窄带线谱,线谱能量高于连续谱。与水下声源相比,空中声源的运动速度普遍较高,线谱多普勒频移明显,可用于进行水下对空中声源的运动参数估计。首先通过时频分析提取接收信号的瞬时频率,而后利用非线性最小二乘法将瞬时频率提取值与预测值相拟合,进而估计声源的运动参数(声源的运动速度、静止频率、与接收器最小水平距离及经过最近点时刻)。仿真与实验均能较为准确地估计出声源运动参数,同时在实验中实现了水下对空中运动声源的测距和定位,测距误差小于15.8%。在满足一定信噪比和保证足够多普勒信息的情况下,该参数估计方法具有很好的适用性。The spectrum of airborne source includes broadband continuous spectrum and narrowband line spectrum.The energy of line spectrum is higher than that of continuous spectrum.Compared with underwater sound source,the velocity of airborne source is generally higher and the Doppler shift is more obvious,so it can be used to estimate the motion parameters of airborne source from underwater.Firstly,the instantaneous frequency of the received signal is extracted by time-frequency analysis,and then the extracted instantaneous frequency is fitted with the predicted value by using the non-linear least square method.Then,the motion parameters of the sound source are estimated.Both simulation and experiment can accurately estimate the motion parameters of the sound source.Besides,ranging and positioning of the airborne moving source are successfully performed in the experiment,and the ranging error is less than 15.8%.This parameter estimation method has good applicability under the condition of satisfying a certain signal-to-noise ratio and ensuring sufficient Doppler information.

关 键 词：空中运动声源 水下声场 运动参数估计 水下对空实验 

分 类 号：O427.9[理学—声学]