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1.
为了提高分布式传感网络的估计精度;提出了一种新的自适应一致性算法。该算法在每次迭代时只需部分节点工作;即进行目标状态的监测。通过节点之间二进制信息的交换来调整每次迭代时的一致性权值;使得每次迭代时工作节点所占的权值更大;进而将该一致性算法与卡尔曼滤波相结合对目标状态进行估计。对该算法进行数值仿真;并与其他一致性加权算法进行比较;验证了该算法的有效性。  相似文献   

2.
    
In this paper, the problem of distributed consensus estimation with randomly missing measurements is investigated for a diffusion system over the sensor network. A random variable, the probability of which is known a priori, is used to model the randomly missing phenomena for each sensor. The aim of the addressed estimation problem is to design distributed consensus estimators depending on the neighbouring information such that, for all random measurement missing, the estimation error systems are guaranteed to be globally asymptotically stable in the mean square. By using Lyapunov functional method and the stochastic analysis approach, the sufficient conditions are derived for the convergence of the estimation error systems. Finally, a numerical example is given to demonstrate the effectiveness of the proposed distributed consensus estimator design scheme.  相似文献   

3.
    
This paper presents a design method of finite dimensional robust H distributed consensus filters (DCFs) for a class of dissipative nonlinear partial differential equation (PDE) systems with a sensor network, for which the eigenvalue spectrum of the spatial differential operator can be partitioned into a finite dimensional slow one and an infinite dimensional stable fast complement. Initially, the modal decomposition technique is applied to the PDE system to derive a finite dimensional ordinary differential equation system that accurately describes the dynamics of the dominant (slow) modes of the PDE system. Then, based on the slow subsystem, a set of finite dimensional robust H DCFs are developed to enforce the consensus of the slow mode estimates and state estimates of all local filters for all admissible nonlinear dynamics and observation spillover, while attenuating the effect of external disturbances. The Luenberger and consensus gains of the proposed DCFs can be obtained by solving a set of linear matrix inequalities (LMIs). Furthermore, by the existing LMI optimization technique, a suboptimal design of robust H DCFs is proposed in the sense of minimizing the attenuation level. Finally, the effectiveness of the proposed DCFs is demonstrated on the state estimation of one dimensional Kuramoto–Sivashinsky equation system with a sensor network. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

4.
传感器网络一致性分布式滤波算法   总被引:1,自引:0,他引:1       下载免费PDF全文
为了改善分布式传感器网络的估计性能,提出了一种基于状态预测一致的滤波算法.在对局部估计值进行一致化处理的基础上,重点研究了利用邻居节点前一时刻的估计值对当前局部状态预测值进行修正来提高估计精度.给出了一种一致性增益的选择方法,利用李雅普诺夫方法得到了算法收敛的充分条件,并讨论了影响算法收敛速度的因素.仿真结果表明了算法的有效性,并发现节点度较大的传感器在网络估计中发挥着重要作用,可通过调整这类节点的一致性系数来改善算法性能.  相似文献   

5.
应用自适应滤波算法改进了基于一致滤波器的估计融合算法以加快节点估计的一致收敛速度,提出了一种基于状态预测的自适应一致滤波器.在此算法中,节点采用状态预测值作为自适应滤波器的参考信号,应用自适应算法修正一致滤波器的加权矩阵.仿真结果表明,本文提出的算法不仅能够加快节点估计的一致收敛速度,还能减小收敛过程中节点的估计误差.  相似文献   

6.
在无线传感器执行器中,执行器节点接收传感器节点传来的信息并执行相应的动作。为了满足执行器节点及时地采取行动,无线传感器执行器网络对时延有严格的限制。构建了一种一般性的分布式融合算法并与集中式融合算法比较。通过从网络传输时延、节点能量消耗、网络寿命、有效传输次数等方面分析了这种算法在无线传感器执行器网络中的特性。在三种典型拓扑结构下的仿真实验表明,在相同条件下,分布式融合算法比集中式融合算法具有更小的网络传输时延,更长的网络寿命,同时节点的能量消耗更加均匀。  相似文献   

7.
在分布式传感器网络节点定位技术中,使用数据融合方法以提高探测系统的检测与定位精度正成为研究的热点。提出了一种应用于分布式传感器网络中的数据融合定位算法,通过对各个传感器节点的定位信息的加权求和来进行数据融合,用来提高探测系统目标定位的精度。该算法采用两级自适应调整得到最优加权因子,首先利用线性最小均方差(LMSE)算法得到权系数的初始值,然后利用训练节点和递归最小二乘(RLS)算法自适应地调整达到最优。对静态和运动目标的定位数据融合算法进行了仿真,仿真结果表明:相比单节点定位,提出的融合算法的定位精度有约1—2个数量级的提高。  相似文献   

8.
    
In this paper, the distributed state estimation problem is investigated for a class of uncertain sensor networks. The target plant is described by a set of uncertain difference equations with both discrete-time and infinite distributed delays, where two random variables are introduced to account for the randomly occurring nonlinearities. The sensor measurement outputs are subject to randomly occurring sensor saturations due to the physical limitations of the sensors. Through available output measurements from each individual sensor and its neighboring sensors, this paper aims to design distributed state estimators to approximate the states of the target plant in a distributed way. Sufficient conditions are presented which not only guarantee the estimation error systems to be globally asymptotically stable in the mean square sense but also ensure the existence of the desired estimator gains.  相似文献   

9.
    
The paper proposes an innovative estimation and control scheme that enables the distributed monitoring and control of large-scale processes. The proposed approach considers a discrete linear time-invariant process controlled by a network of agents that may both collect information about the evolution of the plant and apply control actions to drive its behaviour. The problem makes full sense when local observability/controllability is not assumed and the communication between agents can be exploited to reach system-wide goals. Additionally, to reduce agents bandwidth requirements and power consumption, an event-based communication policy is studied. The design procedure guarantees system stability, allowing the designer to trade-off performance, control effort and communication requirements. The obtained controllers and observers are implemented in a fully distributed fashion. To illustrate the performance of the proposed technique, experimental results on a quadruple-tank process are provided.  相似文献   

10.
提出了基于无线传感器网络的分布递阶信息融合方法,下层源节点采用卡尔曼滤波及基于减少能耗和网络冲突的数据处理方法,上层汇聚节点采用方差最小的加权信息融合方法,该方法能有效降低传感器网络能耗和网络信息冲突,仿真结果表明了该方法的有效性和可靠性。  相似文献   

11.
    
This paper is concerned with the distributed resilient estimation problem for a class of nonlinear time‐delayed systems subject to stochastic perturbations. The plant and the measurements are disturbed by two Gaussian white stochastic processes with known statistical information, respectively. In addition, a resilient estimator is designed for each node by means of the parameter uncertainties and Bernoulli‐distributed random variables. Then, a novel exponential‐bounded performance index is put forward to measure the disturbance rejection level of the distributed estimators against the external disturbances and the impact of the initial values. A new vector dissipation definition including multiple vectors of energy storage functions is established to deal with the time‐delay estimation error dynamics. Within the framework of local performance analysis inspired by this new definition of vector dissipation, sufficient conditions in terms of recursive linear matrix inequalities are constructed for each node to guarantee the desirable performance index. Next, a local optimization problem subject to a set of recursive linear matrix inequalities is presented for each node to minimize the upper bound in the performance index, where the calculations can be conducted on every node in a distributed manner and the estimator gains are also calculated. Finally, an illustrative simulation example is provided to verify the applicability of the proposed estimators.  相似文献   

12.
In this paper, we propose a strategy for distributed Kalman filtering over sensor networks, based on node selection, rather than on sensor fusion. The presented approach is particularly suitable when sensors with limited sensing capability are considered. In this case, strategies based on sensor fusion may exhibit poor results, as several unreliable measurements may be included in the fusion process. On the other hand, our approach implements a distributed strategy able to select only the node with the most accurate estimate and to propagate it through the whole network in finite time. The algorithm is based on the definition of a metric of the estimate accuracy, and on the application of an agreement protocol based on max-consensus. We prove the convergence, in finite time, of all the local estimates to the most accurate one at each discrete iteration, as well as the equivalence with a centralised Kalman filter with multiple measurements, evolving according to a state-dependent switching dynamics. An application of the algorithm to the problem of distributed target tracking over a network of heterogeneous range-bearing sensors is shown. Simulation results and a comparison with two distributed Kalman filtering strategies based on sensor fusion confirm the suitability of the approach.  相似文献   

13.
分布式决策融合方法以其成本低廉、可靠性高、生存能力强、带宽要求低等优点而在多传感器检测系统特别是无线传感器网络中具有广阔的应用前景,但是传感器网络具有有限的能量、有限的计算能力、有限的通讯带宽,以及存在无线信道衰落、传输错误和干扰噪声对分布式决策融合理论带来挑战。介绍了分布式检测和决策融合的理论基础,对近年来无线传感器网络下的分布式决策融合理论方法及其研究进展进行了详细的综述,分析并展望了该领域存在的问题和前景,探讨了进一步的研究方向。  相似文献   

14.
    
Robust state estimation problem subject to a communication constraint is investigated in this paper for a class of wireless sensor networks constituted by multiple remote sensor nodes and a fusion node. An analytical robust fusion estimator using local event‐triggered transmission strategies is derived aiming to reduce energy consumption of the sensor nodes and refrain from network traffic congestion. Some conditions are presented guaranteeing the uniformly bounded estimation errors of the robust state estimator. Several numerical simulations are presented to show the validity of the proposed method.  相似文献   

15.
    
The paper proposes a distributed control of nodes transmission radii in energy-harvesting wireless sensor networks for simultaneously coping with energy consumption and consensus responsiveness requirement. The stability of the closed-loop network under the proposed control law is proved. Simulation validations show the effectiveness of the proposed approach in nominal scenario as well as in the presence of uncertain node power requirements and harvesting system supply.  相似文献   

16.
    
Robust state estimation problem for wireless sensor networks composed of multiple remote sensor nodes and a fusion node is investigated subject to a limitation on the communication rate. An analytical robust fusion estimator based on a data‐driven transmission strategy is derived to save the sensor energy consumption and reduce the network traffic congestion. The conditions guaranteeing the uniform boundedness of estimation errors of the robust fusion estimator are investigated. Numerical simulations are provided to show the effectiveness of the proposed approach. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

17.
利用分布式滚动时域方法对无线传感器网络的状态估计问题进行研究,给出了基于量化测量值的滚动时域估计算法。在无线传感器网络的环境下处理分布式状态估计问题时,减少通信的成本是非常重要的一个环节,需要将观测值量化后再传送。以往的滚动时域估计方法无法处理量化观测值的状态估计问题,而本文的方法考虑了最严格的观测值量化情况即传感器只发送一个比特至融合中心的状态估计问题。与其它传感器网络中的状态估计方法相比,该方法减少了每一步的计算量。仿真结果验证了该算法的有效性。  相似文献   

18.
    
Wireless sensor networks (WSNs) are usually deployed for monitoring systems with the distributed detection and estimation of sensors. Sensor selection in WSNs is considered for target tracking. A distributed estimation scenario is considered based on the extended information filter. A cost function using the geometrical dilution of precision measure is derived for active sensor selection. A consensus-based estimation method is proposed in this paper for heterogeneous WSNs with two types of sensors. The convergence properties of the proposed estimators are analyzed under time-varying inputs. Accordingly, a new adaptive sensor selection (ASS) algorithm is presented in which the number of active sensors is adaptively determined based on the absolute local innovations vector. Simulation results show that the tracking accuracy of the ASS is comparable to that of the other algorithms.  相似文献   

19.
运用一致性检验原理,提出了一种有效的分布式离散Kalman滤波器;分析了用于多传感器数据融合的分布式Kalman滤波方法,并将经过一致性检验的量测数据引入分布式Kalman滤波器进行数据融合;当干扰噪声的统计特征发生变化时,仿真结果表明该滤波器可以大大提高数据融合的精度。  相似文献   

20.
In this work, we consider state estimation based on the information from multiple sensors that provide their measurement updates according to separate event-triggering conditions. An optimal sensor fusion problem based on the hybrid measurement information (namely, point- and set-valued measurements) is formulated and explored. We show that under a commonly-accepted Gaussian assumption, the optimal estimator depends on the conditional mean and covariance of the measurement innovations, which applies to general event-triggering schemes. For the case that each channel of the sensors has its own event-triggering condition, closed-form representations are derived for the optimal estimate and the corresponding error covariance matrix, and it is proved that the exploration of the set-valued information provided by the event-triggering sets guarantees the improvement of estimation performance. The effectiveness of the proposed event-based estimator is demonstrated by extensive Monte Carlo simulation experiments for different categories of systems and comparative simulation with the classical Kalman filter.  相似文献   

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