共查询到20条相似文献，搜索用时 921 毫秒
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反鱼雷鱼雷(Anti-torpedo torpedo,ATT)作为一种可主动搜索并拦截多种制导类型来袭鱼雷的硬杀伤武器,毁伤概率高,成为各国水下防御的重要发展方向。在介绍现有鱼雷制导类型和各种鱼雷防御手段特点的基础上,指出了 ATT 武器的优势,整理了国外 ATT 武器发展现状,详述各国 ATT 武器的发展历程和基本特点。最后,对 ATT 武器的作战使用开展研究,仿真分析不同条件下 ATT 对来袭鱼雷的拦截概率,为开展 ATT 武器研制及其作战使用研究提供支撑。 相似文献
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鱼雷打靶试验对评价武器系统对目标的打击性能具有重要意义。水动力参数是模拟鱼雷水下运动轨迹、预报鱼雷打靶落点的关键参数。随着现代 CFD 技术的发展,采用数值方法获取水动力参数,提高了轨迹预报精度,但计算效率不高,不利于多工况下鱼雷打靶预报。首先,基于刚体动量和动量矩定理建立了鱼雷的水下运动方程组,运用 4 阶龙格–库塔(Runge-Kuta)法对运动方程组进行数值求解,对鱼雷水下轨迹进行模拟,从而获取鱼雷打靶性能。其次,提出了基于遗传算法的近似模型(GA-BP)和自适应遗传算法优化的近似模型(AGA-BP)模拟鱼雷水下打靶落点,对鱼雷打靶性能进行快速预报。通过仿真和数据对比,结果表明：AGA-BP 预测模型相对于 BP 预测模型更稳定、GA-BP 预测模型收敛速度更快,实现对鱼雷水下打靶快速预报。 相似文献
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从潜艇反鱼雷防御的角度出发,主要介绍和分析了潜艇反鱼雷防御的战术背景、对抗措施的发展现状和未来的发展方向3个方面的内容,针对潜艇面临的鱼雷和反潜威胁,对潜艇主动和被动防御的技术特点进行了总结,重点对潜艇针对未来反潜作战需求构建网络中心化、多层次、多平台、智能化的综合防御体系进行了思考和设想,为潜艇水下反鱼雷防御技术发展、体系构建提供了重要的参考价值。 相似文献
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迄今为止世界上各种鱼雷防御装备林林总总、不一而足,而且层出不穷。分析了目前鱼雷软、硬杀伤手段的不足,重点分析了反鱼雷鱼雷(ATT)的局限性,对比空中反导系统,指出了目前ATT技术的误区。最后给出了一种近距离鱼雷防御的方法:多发深弹在水下形成可移动的弹阵,采用深弹协同作战的方式防御鱼雷。 相似文献
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超空泡射弹具有水下高速打击能力,在应对来袭鱼雷攻击时,可以选择精准点射或密集发射形成弹幕的方式有效拦截目标。超空泡射弹与其他反鱼雷武器一同构成水下防御网,为作战样式提供更多选择。 首先利用层次分析法,确定反鱼雷作战的各项能力指标权重;然后针对不同武器的作战能力,分别设计不同的品质效用函数,由此计算出具体的能力赋值。最后,通过模型计算出超空泡射弹在反鱼雷作战中的体系贡献率,以此推动与之相关的超空泡发生器、水下制导和水下高速推进系统等关键技术得到足够的重视和发展, 为后续研制生产和尽快投入部队形成战斗力提供参考。 相似文献
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刘建兵 《数字海洋与水下攻防》2019,2(4):87-90
潜艇具有水下隐蔽性好、艇载声呐被动探测距离远等特点，一般能先于水面舰艇发现并开展攻击。为与潜艇进行有效对抗，水面舰艇大多利用舰载直升机实施反潜搜索和攻击。针对水面舰艇受到水下目标较大威胁的突发态势，分析研究了舰载直升机在应急状态下，悬停空投鱼雷攻击水下目标投雷点计算方法， 研究成果可为部队空投鱼雷作战使用提供可靠的决策理论依据。 相似文献
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为提升水面舰艇编队水下防御能力,构建以水面无人艇为补充的编队水下防御装备体系是未来发展的重要方向.在总结国内外水面无人艇现状及发展趋势的基础上,分析了无人艇的发展必要性,结合水面舰艇编队防御鱼雷攻击的任务需求,开展了水面无人艇作战使用方法研究,并对其对抗效能进行了仿真分析评估.相关研究成果可牵引水面无人艇在水下信息对抗... 相似文献
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基于潜艇被动声呐系统跟踪目标,进行目标运动分析后，发射线导鱼雷攻击水面舰艇的作战背景,建立了鱼雷导引方法、声呐目标分辨和目标运动分析的数学模型,通过仿真研究了鱼雷发射后本艇战术机动对线导鱼雷攻击远距离水面攻击效能的影响。根据鱼雷作战效能蒙特卡洛仿真方法,给出在一定目标运动要素误差下,满足线导鱼雷攻击效能指标的鱼雷发射后的本艇战术机动的要求,并给出了武器系统实现这种要求的设计方案。 相似文献
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Acoustic telemetry--An overview 总被引：1，自引：0，他引：1
Acoustic telemetry from underwater submersibles and sensors has been pursued ever since it was recognized that the ocean could support signal transmission. While it has been evident that some form of communication is possible, the ocean has proved to be a distressingly difficult medium in which to achieve high data rates. High data rate transmission requires a wide bandwidth which is severely constrained in the ocean because of the absorption of high-frequency energy. Moreover, the ocean is a very reverberant environment with both time and frequency spreading of signals; this further limits data transmission rates. The net effect of the bandwidth and reverberation constraints has led to either acoustic telemetry systems with low data rates or to the use of tethered systems. Over the years, various forms of acoustic communication systems have been developed. These have included direct AM and SSB for underwater telephones, FM for sensor data, FSK and DPSK for digital data, and parametric sonars for narrow-beam systems. As offshore operations have increased, several other systems have been proposed and/or built to respond to particular needs. In this paper, we review the underwater channel and the limitations that it imposes upon acoustic telemetry systems. We then survey some of the systems that have been built (excluding military systems) and indicate how they use various communication system principles to overcome these limitations. 相似文献
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A current meter designed to measure velocity profiles in the water column above the bed is described. The solution proposed is a coherent backscatter Doppler sonar system using a single transducer. A range-velocity product of 20 m2/s can be achieved by combining state of the art sonar techniques with new processing methods and careful, highly flexible design. Large range-velocity products and very short range resolution together with the possibility of acquiring sensible results without averaging over long time periods are features of this current meter 相似文献
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The maximum error in ocean depth measurement as specified by the International Hydrographic Organization is 1% for depth greater than 30m. Current acoustic multibeam bathymetric systems used for depth measurement are subject to errors from various sources which may significantly exceed this limit. The lack of sound speed profiles may be one significant source of error. Because of the limited ability of sound speed profile measurement, depth values are usually estimated using an assumed profile. If actual sound speed profiles are known, depth estimate errors can be corrected using ray-tracing methods. For depth measurements, the calculation of the location at which a sound pulse impinges on the sea bottom varies with the variation of the sound speed profile. We demonstrate that this location is almost unchanged for a family of sound speed profiles with the same surface value and the same area under them. Based on this observation, we can construct a simple constant-gradient equivalent sound speed profile to correct errors. Compared with ray-tracing methods, the equivalent sound speed profile method is more efficient. If a vertical depth is known (or independently measured), then depth correction for a multibeam system can be accomplished without knowledge of the actual sound speed profile. This leads to a new type of precise acoustic multibeam bathymetric system. 相似文献
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An acoustic correlation current profiler (ACCP) system is being developed to obtain vertical profiles of current velocities to ranges of approximately 1500 m. A single transmitter and a spatial array of eight receivers arranged in a novel geometry are employed to measure water mass displacement from receiver array cross-correlation functions. Test data from a shallow water ACCP operating at 76.8 kHz are presented and compared to model predictions as well as to velocity profiles obtained simultaneously during the tests from an adjacent acoustic Doppler current profiler. Additionally, predicted performance data for a lower frequency deep-water unit are presented 相似文献
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Precise Multibeam Acoustic Bathymetry 总被引：7，自引：0，他引：7
The maximum error in ocean depth measurement as specified by the International Hydrographic Organization is 1% for depth greater than 30m. Current acoustic multibeam bathymetric systems used for depth measurement are subject to errors from various sources which may significantly exceed this limit. The lack of sound speed profiles may be one significant source of error. Because of the limited ability of sound speed profile measurement, depth values are usually estimated using an assumed profile. If actual sound speed profiles are known, depth estimate errors can be corrected using ray-tracing methods. For depth measurements, the calculation of the location at which a sound pulse impinges on the sea bottom varies with the variation of the sound speed profile. We demonstrate that this location is almost unchanged for a family of sound speed profiles with the same surface value and the same area under them. Based on this observation, we can construct a simple constant-gradient equivalent sound speed profile to correct errors. Compared with ray-tracing methods, the equivalent sound speed profile method is more efficient. If a vertical depth is known (or independently measured), then depth correction for a multibeam system can be accomplished without knowledge of the actual sound speed profile. This leads to a new type of precise acoustic multibeam bathymetric system. 相似文献
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The accuracy of GPS/Acoustic positioning is crucial for monitoring seafloor crustal deformation. However, the slant range residual is currently the only indicator used to evaluate the precision of positioning seafloor transponders. This study employs a unique Seafloor Acoustic Transponder System (SATS) to evaluate the accuracy of GPS/Acoustic seafloor positioning. The SATS has three transponders and an attitude sensor in a single unit, which provides true lengths of transponder baselines and true attitude of the SATS to ensure assessment reliability and validity. The proposed approach was tested through a GPS/Acoustic experiment, in which an off-the-shelf acoustic system was used to collect range measurements. Using GPS/Acoustic geodetic observations, the positions of three transponders on the SATS were estimated by an optimization technique combined with ray-tracing calculations. The accuracy of the GPS/Acoustic seafloor positioning is assessed by comparing the true baselines and attitude with the results derived from the position estimates of the three transponders. A sensitivity analysis is conducted to investigate the robustness of the GPS/Acoustic positioning results to changes of sound speed. Experimental results demonstrate that the use of the SATS can help to assess the validity of the GPS and acoustic travel time measurements in the GPS/Acoustic seafloor positioning. 相似文献
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The unique environment of the abyssal plains allows many simplifying assumptions, facilitating the acoustic classification of an animal into one of two groups. The most important assumptions are based on low population densities and available target strength histograms and swim rate histograms. The likelihood ratio is formed from this information and accepted signal processing theory. The likelihood function, a three-dimensional integral, is analytically simplified to one dimension and then solved numerically. A simulation based on this solution and measured data demonstrates that classification using the likelihood ratio approach is accurate, e.g. the sensitivity is ⩾0.8. Although the measured data come from two abyssopelagic genera, the methods presented are more generally applicable. Simulations based on hypothetical animal populations show that under certain conditions, a near perfect classification can be made, e.g. sensitivity and specificity greater than 0.969 相似文献