共查询到19条相似文献,搜索用时 171 毫秒
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分布式导航系统是飞机多传感器导航系统设计的新概念,可以大幅提高系统导航性能和容错水平,并能动态配置传感器功能,但是目前并无完善的信息融合算法与之对应;文章在构建惯性传感器网络的基础上,将多个低成本惯性传感器系统配置在飞机的多个位置以作为网络节点,设计了分阶段处理的分布式信息融合算法,综合利用各节点所测量的惯性信息,最后得到本节点的局部状态估计;通过仿真实验表明,采用此方法,有效降低了导航滤波估计误差,因此,系统导航性能及容错能力得到大幅提高。 相似文献
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为了获得传感器网络中监测目标的准确状态,需要同时考虑多源节点簇信息融合的时间性和空间性.本文提出了一种多源传感器信息的时空两级融合结构.对同一时刻多源节点簇信息,利用D-S证据理论和支持度进行空间融合,对经空间融合后的时间序列,利用模糊积分、支持度和遗传算法进行时间上的信息融合.仿真实验表明,据此形成的分布式多源节点簇信息融合系统具有目标探测能力、抗干扰能力和容错能力. 相似文献
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基于D-S证据理论和BP神经网络的多传感器信息融合 总被引:3,自引:0,他引:3
针对多传感器信息融合的基本可信度分配在实际应用中难以解决的问题,提出了一种基于D-S证据理论与BP网络相结合的多传感器信息融合的改进方法。该方法充分发挥BP神经网络自学习、自适应和容错的能力,利用BP神经网络处理证据理论的基本可信度问题,再利用D-S证据理论来处理不精确、模糊的信息。最后通过一个实例证明了该方法的有效性。 相似文献
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针对现有动态知识图谱推理方法大多存在同时间多关系下推理能力有限的问题,文中提出基于多关系循环事件的动态知识图谱推理方法.利用改进的多关系邻近聚合器融合目标实体邻域信息,获得更准确的实体邻域向量表示,并通过优化信息融合简化文中方法.同时加入关系预测任务,扩大处理特定范围内两个实体间关系冲突的能力.在大型真实数据集上的实体预测和关系预测的实验表明,文中方法有效提升动态知识图谱的推理能力. 相似文献
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研究了多传感器采样系统在发生一类典型故障情况下的分布式融合估计问题;首先,针对局部传感器,利用Kalman滤波获得的新息进行故障检测;然后在最小方差意义下发展了传感器故障在线递归估计方案;进一步将所获得的估计结果对故障传感器的测量值进行重构,并应用射影定理建立了局部传感器容错更新算法;最后基于线性最小方差融合原则给出了多传感器采样系统的分布式容错估计方案;相比于已有融合估计方法,所提方案不仅能及时检测传感器故障,并且能进一步充分利用故障传感器信息来提高估计精度;数值仿真验证了方法的有效性和优越性。 相似文献
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针对模糊信息融合的局限性,提出了一个基于Vague集的多传感器信息融合方法。建立了基于Vague集的多传感器信息融合模型,然后给出了适合信息融合的相应定义,最后给出了该方法的数学描述、数据组织、结果评价及算法实现过程。通过实例研究,验证了该方法的有效性和正确性。 相似文献
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ChenJian Ran 《International journal of systems science》2013,44(10):1697-1708
For multisensor systems with unknown parameters and noise variances, three self-tuning measurement fusion Kalman predictors based on the information matrix equation are presented by substituting the online estimators of unknown parameters and noise variances into the optimal measurement fusion steady-state Kalman predictors. By the dynamic variance error system analysis method, the convergence of the self-tuning information matrix equation is proved. Further, it is proved by the dynamic error system analysis method that the proposed self-tuning measurement fusion Kalman predictors converge to the optimal measurement fusion steady-state Kalman predictors in a realisation, so they have asymptotical global optimality. Compared with the centralised measurement fusion Kalman predictors based on the Riccati equation, they can significantly reduce the computational burden. A simulation example applied to signal processing shows their effectiveness. 相似文献
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信息融合技术是一个多学科高度集成的热点研究领域,目前针对煤矿井下环境监测系统的安全隐患问题,提出了一种基于无线传感器网络的分布递阶卡尔曼滤波信息融合算法,其中下层源节点采用改进卡尔曼滤波算法,上层汇聚节点采用方差自适应的加权信息融合算法,该算法能有效降低无线传感器网络能耗和网络信息冲突,实现信号重构.仿真结果表明,该算法具有很高的可靠性和信息融合精度,有较好的工程实用价值. 相似文献
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A hierarchical controller is proposed for achieving high-accuracy control and the dynamic balance with the presence of multiple faults of actuator, the external disturbance, and the model uncertainties in multicylinder hydraulic press machine (MCHPM). The method divides the controller design into three steps: Virtual fault-tolerant control law, control allocation algorithm, and actuator control law, which are progressive. First, to precisely compensate the lumped disturbances including the multiple faults of actuator, the external disturbance, and the model uncertainties, a disturbance observer (DO) is developed. By combining the observer with the sliding mode control (SMC), a virtual fault-tolerant control law is designed. Second, a highly integrated control allocation algorithm for the virtual fault-tolerant control law is proposed to get the desired driving force, taking into account dynamic control allocation (DCA), multiobjective optimization (MOO) and Analytic Hierarchy Process (AHP) simultaneously. Third, taking the driving force obtained from above control allocation algorithm as the desired target, the control law of each cylinder is calculated. The global stability for the whole system is proved by the Lyapunov theory. Lastly, results of simulation and experiment show that the proposed controller can effectively handle different faults and have more superior control performance. 相似文献
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The network structure exhibits a variety of changes over time. Fusing this structure and the development of communities in dynamic networks plays an important role in analyzing the evolution and development of the entire network. How to ensure the division of the community structure in social network big data, as well as ensure the continuity of the community between the current time and previous time period, are issues that need to be explored. This problem can be solved by fusing the three characteristics of temporal variability, stability, and continuity in dynamic social network communities, and by adopting the multi-objective optimization method to detect community structures in dynamic networks. The probability fusion method is added to the initial step of the algorithm to generate suitable network partitions and ensure fast convergence and high accuracy. Two neighboring fusion strategies are proposed that are suitable for communities: the neighbor diversity strategy and the neighbor crowd strategy. These two strategies make different changes to the candidate network partitions. A continuity metric for dynamic community evolution is formulated to compare the similarity of the dynamic network communities of two consecutive time steps. Experiments on synthetic datasets and actual datasets prove that the proposed method in this paper provides better performance than existing methods. 相似文献
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在多传感器信息融合中,已有的航迹融合算法都是在噪声方差已知情况下基于最优的卡尔曼滤波算法的,而实际应用中噪声方差往往是未知的.针对上述问题,基于扩展记忆因子递推最小平方(EFRLS)估计的滤波方程,研究了噪声方差未知情况下集中式、分布式、混合式多传感器航迹融合方法.并对三种航迹融合算法的跟踪性能和卡尔曼滤波融合算法的性能进行了仿真比较.由于多级式多传感器的航迹融合方法可由本文的方法直接推广,所以只需研究两级的情况就可. 相似文献