浅海低频声场水声信号时间相关性研究

起伏的声场接收信号是时变的,浅海声场的时间相关性研究有利于目标深度的判别以及水声信号的数据融合。研究浅海低频声场时间相关性以信号的自相关和互相关原理为基础,完成对信号时间相关半径、相关函数值的影响因素分析,得到不同声场条件下信号传播的作用结果。通过仿真比较在不同频率、不同信噪比条件下低频声场信号的相关性曲线,并结合实际海试数据进行验证。研究表明浅海低频声场随机扰动随着低频波长的增加而减弱,且信号时间相关性研究为声场的实际应用提供了一定参考。

The study of time correlation analysis under the condition of shallow low frequency under shallow-water acoustic field

The research on time correlation of shallow-water acoustic field is beneficial to the determination of target depth distinguishing and the information fusion of underwater acoustic signals. The time correlation study in low-frequency shallow-water acoustic field is based on the principle of auto-correlation and cross-correlation of signals. Through the analysis of the signal correlation radius and the factors influencing correlation function, the effects of signal propagation on signal correlation under different conditions of acoustic fields become clear. By simulations the correla-tion curves of the low frequency acoustic signals with different frequencies and different SNRs are compared, and then verified with sea trial data. Studies show that the stochastic perturbation in low frequency shallow-water acoustic field decreases with increasing wavelength. And the study of signal time-correlation would provide a reference for the prac-tical applications of acoustic field characteristics.