共查询到19条相似文献,搜索用时 218 毫秒
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航空声呐浮标依靠水下声系统采集水下目标辐射噪声或者发射声脉冲并接收回波信号,实现探测功能。通过分析水下声系统运动的物理模型,将运动过程分为加速运动、匀速运动和减速运动等3个阶段,分别建立运动方程,求出各阶段的速度函数或位移函数。对相关参数赋值,得出相应曲线和水中释放时间。根据分析的方法和结论,进一步地研究更多类型航空声呐浮标水中释放过程,为反潜作战部署提供理论支撑。 相似文献
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声纳系统是海军的重要装备,也是最基本、最重要的反潜探测设备。舰用反潜声纳是海军水声设备中用得最多的探测设备。在舰用反潜声纳(主动/被动)中,有基阵安装在舰壳的舰壳声纳和声纳基阵在拖曳电缆末端的鱼形拖体内的变深声纳(VDS)两类。舰壳声纳是早期反潜用的声纳,它具有较强的机动探测能力等优点,但这种声纳也有很多缺点,最严重的是工作时 相似文献
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目标和环境特性对被动声呐浮标探测范围的影响 总被引:1,自引:0,他引:1
被动声呐浮标的探测性能不仅和自身设备性能有关,还和目标运动特征及环境特性有着密切的关系。通过建立潜艇目标运动、海洋环境的数学模型,利用浅海平滑平均声场理论推导了潜艇深度变化后被动声呐浮标的探测范围,讨论了潜艇采用不同航速、航深以及海洋环境对被动声呐浮标探测范围的影响,并进行了仿真。结果表明,目标和环境特性对被动声呐浮标的探测范围有重要影响,这对航空反潜作战训练具有一定的指导意义。 相似文献
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声纳浮标网络可用于对潜艇等水下目标进行定位。针对声纳浮标节点的特性,提出一种新的时间加权质心算法。新的时间加权质心算法将各个节点探测的信号强度反映到节点发送探测信息的等待时间中,利用等待时间的长短对各节点位置进行加权,因此权重体现了各节点到目标的距离,提高了目标定位精度,而通信量与一般质心算法相同。仿真结果验证了算法的有效性。 相似文献
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In underwater target detection, the bottom reverberation has some of the same properties as the target echo, which has a great impact on the performance. It is essential to study the difference between target echo and reverberation. In this paper, based on the unique advantage of human listening ability on objects distinction, the Gammatone filter is taken as the auditory model. In addition, time-frequency perception features and auditory spectral features are extracted for active sonar target echo and bottom reverberation separation. The features of the experimental data have good concentration characteristics in the same class and have a large amount of differences between different classes, which shows that this method can effectively distinguish between the target echo and reverberation. 相似文献
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In underwater target detection, the bottom reverberation has some of the same properties as the target echo, which has a great impact on the performance. It is essential to study the difference between target echo and reverberation. In this paper based on the unique advantage of human listening ability on objects distinction, the Gammatone filter is taken as the auditory model. In addition, time-frequency perception features and auditory spectra features are extracted for active sonar target echo and bottom reverberation separation. The features of the experimental data have good concentration characteristics in the same class and have a large amount of differences between different classes, which shows that this method can effectively distinguish between the target echo and reverberation. 相似文献
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自主飞行声呐浮标是一种能够在管内发射并具备自主飞行能力的声呐浮标,其使传统声呐浮标摆脱了对造价高昂的空中投送平台的依赖,可适装于各类中小型水面舰艇、无人艇平台,并满足对水下战场态势远距离快速感知的作战需求。介绍无人机管内发射技术和声呐浮标技术的发展现状,提出自主飞行声呐浮标的设计思路,总结自主飞行声呐浮标集群作战的关键技术,包括集群控制、集群智能决策、组网探测等,分析自主飞行声呐浮标集群在广域协同探测、多源信息保障、辅助作战效能评估等方面的作战样式,结果可为自主飞行声呐浮标集群的论证、设计、应用提供借鉴。 相似文献
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在浅海环境中混响是造成主动声呐性能下降的主要原因之一。混响是由发射信号引起的,其频域上覆盖区域与发射信号基本重合,时域上与发射信号及目标回波强相关,这给混响和目标的分离造成了很大的困难。本文借鉴PD雷达中的动目标检测方法,提出一种适用于声呐动目标检测的滤波器设计算法。该算法利用运动目标回波和混响在时频域上的不同特性,设计了级联自适应滤波器实现混响抑制和目标增强。在此基础上进行匹配滤波等处理可以获得理想的效果。该算法可大幅提高信混比,有效改善运动目标的检测能力。 相似文献
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The analysis and characteristic extraction of target echo characteristics are important in underwater target detection and recognition. Rigid acoustic scattering components are generally used as major echo contributors with relatively stable characteristic information. Previous studies focus on echo characteristics from a single angle, thereby limiting the amount of extracted characteristic information. This paper aims to establish a full-angle rigid echo components model and overcome the difficulty of the extraction of time delay characteristics of narrow-band acoustic scattering echoes. On the basis of the analysis of the target echo highlight model, the echo characteristics of rigid acoustic scattering components are extracted in the cepstrum domain, and a wavelet process is proposed to enhance the effect of time delay estimation. Experimental data indicate that the extracted time delay characteristics accord with the rigid echo characteristics of underwater target, thereby validating the effectiveness of the cepstrum method. 相似文献
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《船舶与海洋工程学报》2017,(2)
The analysis and characteristic extraction of target echo characteristics are important in underwater target detection and recognition. Rigid acoustic scattering components are generally used as major echo contributors with relatively stable characteristic information. Previous studies focus on echo characteristics from a single angle, thereby limiting the amount of extracted characteristic information. This paper aims to establish a full-angle rigid echo components model and overcome the difficulty of the extraction of time delay characteristics of narrow-band acoustic scattering echoes. On the basis of the analysis of the target echo highlight model, the echo characteristics of rigid acoustic scattering components are extracted in the cepstrum domain, and a wavelet process is proposed to enhance the effect of time delay estimation. Experimental data indicate that the extracted time delay characteristics accord with the rigid echo characteristics of underwater target, thereby validating the effectiveness of the cepstrum method. 相似文献