摘要
针对水下目标未知线谱的检测问题,依据水下目标辐射噪声中含有高强度稳定低频线谱成分和低频水声信号相位的高稳定性等特征,并结合矢量水听器的特性,提出了一种基于矢量水听器瞬时相位差方差加权的低频线谱检测算法。该方法根据背景噪声单元声压-振速相位差随机起伏大、目标辐射线谱频率单元声压-振速相位差方差比较稳定的特点,对各频率单元进行互谱相位方差加权,提高了线谱输出信噪比。理论分析和海试结果表明:输入谱级信噪比大于-12 d B时,该方法可以有效抑制起伏背景干扰、增强目标未知低频线谱能量,为水下UUV等低速小型平台探测目标低频线谱提供了可能,具有较好的工程应用前景。
Aiming at the detection of unknown line spectrum of underwater target,according to the characteristics of underwater target radiated noise including high-intensity stable low frequency line spectrum component and high stability of low frequency underwater acoustic signal phase,combined with the characteristics of the vector hydrophone,a low frequency line spectrum detection algorithm based on instantaneous phase difference variance weighting of vector hydrophone is proposed. According to the characteristics of large random fluctuation of the phase difference between the sound pressure and the velocity of the background noise element and the relatively stable variance of the phase difference between the sound pressure and the velocity of the frequency element of the target radiation line spectrum,the cross spectrum phase variance of each frequency element is weighted to improve the output signal-to-noise ratio( SNR) of the line spectrum. Theoretical analysis and sea test results show that when the input spectral SNR is greater than-12 dB,This method can effectively suppress the fluctuating background interference and enhance the unknown low frequency line spectrum energy of the target,which provides a possibility for the detection of low frequency line spectrum of the target on small low-speed platforms such as underwater UUV,and has a good engineering application prospect.
作者
朱秀珍
乔长城
杨清海
ZHU Xiuzhen;QIAO Changcheng;YANG Qinghai(The 27^th Research Institute of China Electronic Science and Technology Group Corporation,Zhengzhou 450047,China;Zhengzhou Key Laboratory of Underwater Information System Technology,Zhengzhou 450047,China)
出处
《电声技术》
2020年第1期24-27,47,共5页
Audio Engineering
关键词
线谱检测
矢量水听器
互谱
瞬时相位差方差
line spectrum detection
vector hydrophone
cross spectrum
variance of instantaneous phase difference
