共查询到19条相似文献,搜索用时 140 毫秒
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为了进一步提高机载预警雷达的目标探测和监视能力,首先对影响单平台机载预警雷达探测范围的因素进行了分析,引出网络化协同探测的特点和必要性,给出了稳定探测覆盖范围和多普勒盲区的定义;其次重点分析了机载预警雷达与其他机载预警雷达、舰载雷达、无人机(UAV)雷达等不同平台雷达间的协同探测工作方式,并进行了仿真分析,通过评估指标参数对各种协同探测模式进行了比较;最后对机载预警雷达网络化协同探测发展趋势进行展望。 相似文献
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分布式孔径相参雷达是指空间分置的多部雷达在统一的控制和调度下,实现对目标信号级相参探测,具有探测威力大、测量精度高等优势,可应用于防空反导、预警探测、精密跟踪和空间目标监视等领域。本文针对分布式孔径雷达相参探测在预警领域的应用开展技术研究,首先分别给出了一发多收和多发多收相参合成预警探测工作原理;然后从探测威力和检测概率两方面对相参合成预警探测性能进行了分析,结果表明,相参合成对探测威力和检测概率改善效果明显;在此基础上,构建了低频段一发两收相参合成预警探测试验系统,通过对飞机目标相参探测试验验证了分布式孔径雷达相参合成预警探测的性能优势。 相似文献
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针对低空目标突袭的威胁,根据低空目标普遍携带雷达高度表的特征,提出了基于雷达高度表信号探测的低空目标检测技术。针对海面飞行环境,根据双基地雷达的原理,对海面雷达散射信号进行了理论计算,从功率角度对低空目标检测可行性进行了分析,并给出了将侦察系统升空探测低空目标所携雷达高度表信号的方法,达到了对低空突防目标预警探测的要求。 相似文献
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针对现有反导预警体系对临近空间高超声速目标预警探测能力不足的问题,基于目标特性详细分析体系内各预警装备对其适用性并提出相应对策。在给出目标运动模型的基础上,通过建立红外探测模型和雷达探测模型,采取与弹道导弹比较的方式详细、定量分析目标飞行高度和横向机动能力对地基雷达的影响及红外辐射可探测性性能,并提出反临预警探测对策。分析结果表明,高超声速目标更低的飞行高度和更强的机动能力导致雷达对其搜索捕获难度更大,但其红外辐射强度大使得对其预警时间更长。仿真数据验证了分析结果的正确性,可为反临预警探测体系建设提供技术支撑。 相似文献
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针对预警探测任务中多雷达传感器协同探测跟踪同一目标时的雷达资源优化分配问题,提出了一种基于改进多目标粒子群优化算法的雷达资源分配方法。为了获得综合效能最大的雷达资源分配方案,建立了以雷达对目标的探测覆盖占比、雷达交接班次数、目标首点发现时刻为目标函数的多雷达资源优化分配模型,给出了基于改进多目标粒子群优化算法求解雷达资源分配模型的具体步骤。仿真结果表明,提出的方法能够合理地进行多雷达资源优化分配,计算结果高效、可行,算法求解结果稳定,能有效避免基本粒子群算法可能遗漏全局最优解情况的产生。 相似文献
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张光义 《中国电子科学研究院学报》2004,(3):8-11
本文讨论对空间载预警探测雷达的需求,空间裁雷达的作用,对空间裁预警探测雷达的主要要求,空间载预警探测雷达技术及设计特点等问题;研制空间裁预警探测雷达对发展电子信息技术的推动作用也进行了说明。 相似文献
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Teng Fu Xi Zhao Lin Chen Wan‐Shou Wu Qing Zhao Xiu‐Li Wang De‐Ming Guo Yu‐Zhong Wang 《Advanced functional materials》2019,29(8)
The fire detection plays a critical role in the maintenance of public security. Previous approaches of early fire warning, based on smoke or temperature response must be set in the proximity of a fire. They cannot provide the additional information of fire location or size and are susceptible to complicated situations. It is still a big challenge to make rapid and accurate early fire warning in precombustion because of the lack of reliable alarm signals. Herein, a precursor molecular sensor (PMS) is designed and synthesized that can present the chemical structure transformation to form phthalocyanines (Pcs) and release a color change signal at about 180 °C, learning from the plant chlorophyll metabolism. Further, the PMS is assembled to an early fire warning component (EWC) and an intelligent image recognition algorithm is introduced for unburned fire detection. The EWC generates a colorful alarm within 20 s at 275 °C. Therefore, the facile PMS provides a reliable real‐time monitoring strategy to the early fire warning detection in precombustion. 相似文献
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基于GF-1影像的巢湖浊度遥感监测及时空变化研究 总被引:1,自引:0,他引:1
浊度监测可以为湖泊水质的污染防控和预警提供科学依据.为了提高湖泊浊度的动态监测能力,将卫星遥感监测和浮标检测站监测相结合,对2019年巢湖浊度的时空变化进行分析.浮标检测站监测通过高频次连续的实测浊度数据的统计分析,研究巢湖浊度时空变化特征;遥感监测通过构建最优波段组合模型对浊度进行定量反演.研究结果表明:(1)巢湖整... 相似文献
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应急通信保障系统是应急通信保障整体化解决方案的集中体现,涵盖了从话务预测、网络监控、性能预警到应急预案管理与自动执行、应急人员管理、应急物资调度以及应急通信保障信息实时发布等诸多功能特点,内容上包括了节假日、重大活动和突发事件所涉及的通信保障工作的关键环节。本文给出了建设应急通信保障系统的原则、目标,基于此,介绍了一种应急通信保障系统整体解决方案,详细分析了其功能特点,并以实例进行了验证。最后,总结了笔者在应急通信保障系统建设过程中的经验。 相似文献
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The monitoring and early detection of Internet worms 总被引:5,自引:0,他引:5
After many Internet-scale worm incidents in recent years, it is clear that a simple self-propagating worm can quickly spread across the Internet and cause severe damage to our society. Facing this great security threat, we need to build an early detection system that can detect the presence of a worm in the Internet as quickly as possible in order to give people accurate early warning information and possible reaction time for counteractions. This paper first presents an Internet worm monitoring system. Then, based on the idea of "detecting the trend, not the burst" of monitored illegitimate traffic, we present a "trend detection" methodology to detect a worm at its early propagation stage by using Kalman filter estimation, which is robust to background noise in the monitored data. In addition, for uniform-scan worms such as Code Red, we can effectively predict the overall vulnerable population size, and estimate accurately how many computers are really infected in the global Internet based on the biased monitored data. For monitoring a nonuniform scan worm, especially a sequential-scan worm such as Blaster, we show that it is crucial for the address space covered by the worm monitoring system to be as distributed as possible. 相似文献
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许多监视与早期预警应用通过具备高时效性的对地观测数据实现。低轨大型星座观测数据接收任务调度的主要挑战是卫星数量大,中心化资源调度冲突消解面临困难。为此,提出一种新的分布式数据接收资源调度方法。首先,基于星间与星地链路融合构建卫星与地面设备之间的分布式传输链路,在卫星、设备、链路组成的无向网络图中,计算数据下传任务期间分布式链路的最短路径及其持续时长;其次,针对由每个设备的最短路径时间窗口合并构成的集合,利用Q学习方法求解数据接收完成率的优化问题。仿真测试结果表明,在典型的数据接收场景下,采用Q学习求解的数据接收完成率优于“先可见先跟踪”的基准资源调度方法,提升接近1%;与仅使用境内地面站的数据接收资源调度相比,数据接收完成率提升超过50%。 相似文献
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Zheyuan Fan 《International Journal of Communication Systems》2022,35(1):e4755
Grid technology based on parallel theory is used to study a large amount of data processing. This research mainly discusses the fault detection of grid dynamic system in a big data environment. In order to verify the communication efficiency between different security nodes of the ZSS system under different operating system conditions, this study will use four physical computers and VM Ware software to establish a simulated communication environment, using GlobusToolkit (GT)'s existing deployment mechanism to realize the overall grid dynamic deployment architecture. Using Web service technology remotely calls the monitoring module interface of resource nodes in the domain and uses standard protocols to send monitoring data. At the same time, in order for the management node to save the monitoring data in the local standardized form of XML, the administrator can use the saved historical data to process system failures, analyze, and predict system performance. In order to solve the problem of information explosion, a fault detector is used to precisely control the cost of message detection and the state distribution of the detection result and the time of message delay. Under special circumstances, it takes 60 min to execute a 30-min job, and the fault detection point consumes an average of 54.33 min. The research results show that the fault-tolerant strategy can improve the performance of resource consumption in the fault-tolerant tracking system. Adopting the method of dynamically adjustable detection interval can effectively reduce the overhead of the grid dynamic system. The detection method used in this study can meet the application requirements of the grid. 相似文献
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研究运用GPS技术完成危运车辆的定位功能,使用传感器技术采集当前车辆及危运品的状态数据,使用GIS技术完成车辆定位的地图显示与操作,集车辆状态实时采集和动态监控、车辆定位和跟踪、应急管理与调度等功能于一体的危运车辆智能监控与预警系统,有效解决现有监控智能化与数据整舍度不足等问题。 相似文献