摘要
在对蛙人水下目标声纳准确检测的研究中,由于携带开式呼吸器的蛙人在水下工作时会产生气泡群,在探测蛙人时,气泡群是蛙人目标强度的一个主要部分,散射特性的研究是水声物理及水下信号处理的内容。但长期以来,对于气泡的研究仅局限于从气泡动力学角度研究气泡运动规律,而没有从目标强度的角度去考察实际水声环境中气泡群目标强度的起伏特性。针对上述情况,分析了水中气泡的运动规律,研究了气泡群的散射特性,利用水下目标的亮点模型理论讨论了气泡群目标强度起伏的机理,并应用数理统计方法将水下蛙人在呼吸时所产生的气泡群建模为具有起伏目标强度的统计模型。通过仿真实验确定统计模型中的参数,并对利用水下目标亮点模型仿真出的气泡群目标强度的随机值进行拟合,拟合结果良好。证明所建立的起伏统计模型能够准确描述水下气泡群的起伏特性,适合实际工程应用,为水下蛙人检测优化提供了重要的理论依据。
In this paper, the dynamic characteristics of bubble in water were analyzed and the acoustic scattering properties of bubble cloud were studied. The cause of the fluctuation of bubble cloud TS was discussed using under- water target highlight model. And a statistical model with fluctuating TS values was established for underwater bubble cloud by means of mathematical statistics method. Parameters in the established model were determined by computer simulations. And the probability distribution curve of the model fitted well against the random values simulated with the highlight model. Simulation results demonstrate that the statistical model can describe the fluctuating properties of the bubble cloud properly. It is suitable for practical applications. The statistical model provides some important sci- ence basis for underwater diver detection algorithms.
出处
《计算机仿真》
CSCD
北大核心
2015年第9期14-18,38,共6页
Computer Simulation
基金
国家自然科学基金资助项目(61271414)
船舶预研支撑技术基金项目(13J4.2.3)
关键词
目标强度
起伏模型
统计模型
气泡群
概率分布
Target strength
Fluctuating model
Statistical model
Bubble cloud
Probability
