论文部分内容阅读
深海声场特定的干涉结构导致其时间相关性的空间起伏,研究这种空间特性可以为水声信号的探测与处理提供重要参考。利用抛物方程声场仿真模型,联合Monte-Carlo数值方法计算分析了深远海线性内波条件下声场时间相关性的空间分布特性。与现有的研究相比,给出了时间相关性的距离和深度起伏特征。结果表明,当接收达到一定距离,声场时间相关性的空间分布具有与声场干涉条纹类似的结构,声场干涉越强,时间相关性越好。此外,声源频率和声速标准差的变化会引起时间相关性空间分布规律的改变,且会聚区传播模式下的改变强于深海声道传播模式。
The specific interference structure of deep-sea acoustic field leads to the time-dependent spatial fluctuation. Studying this spatial characteristic can provide an important reference for the detection and processing of underwater acoustic signals. Using the parabolic equation acoustic field simulation model and the Monte-Carlo numerical method, the spatial distribution characteristics of time-dependent acoustic field under the condition of deep-sea linear internal waves are calculated and analyzed. Compared with the existing research, time-dependent distance and depth fluctuation characteristics are given. The results show that the spatial correlation of the temporal correlation of the sound field has a similar structure with the interference fringes of the sound field when the receiving distance reaches a certain distance. The stronger the sound field interference is, the better the time correlation is. In addition, the change of the sound source frequency and the standard deviation of the sound velocity will cause the change of the spatial distribution of time-dependent, and the change in the convergence mode is stronger than the deep-sea channel propagation mode.