【摘要】 针对低信噪比时难以利用低频分析记录谱中宽带连续谱条纹状干涉图样估计声源运动速度的问题,提出一种基于双水听器利用线谱声强干涉起伏估计运动声源速度的方法。该方法利用声源运动参数对时间维线谱声强干涉起伏进行重采样,得到满足正比关系的不同频率线谱声强干涉起伏。通过建立两频率线谱声强干涉起伏之间相关系数的代价函数,搜索出双水听器各自对应的最近通过时间和距速比参数,再结合声源与双水听器的距离位置关系,最终解算出声源运动速度。仿真实验表明,该方法能有效估计声源运动速度,对背景噪声下低速运动声源有较好的测速效果更多还原

【Abstract】 Considering the difficulty in estimating the acoustic source motion velocity using an interference striation pattern of a broadband continuum spectrum in a low-frequency analysis and recording(LOFAR) spectrum at a low signal-to-noise ratio(SNR), a moving sound source velocity estimation method based on the interference fluctuation of the line spectrum acoustic intensity with dual hydrophones is proposed. This method utilizes the motion parameters of the acoustic source to resample the temporal interference fluctuation of the line spectrum acoustic intensity and obtains the interference fluctuation of the line spectrum acoustic intensity at different frequencies that satisfy a proportional relationship. The time of the closest position of approach(CPA) and the range-to-velocity ratio of each hydrophone are determined by establishing the correlation coefficient cost function of the acoustic intensity interference fluctuation between the two frequency line spectra. By combining the position relationship between the acoustic source and the dual hydrophones, the velocity of the moving acoustic source can be calculated. The simulation results demonstrate that the proposed method can effectively estimate the velocity of a moving acoustic source and achieve good performance for a low-speed acoustic source in background noise.更多还原