共查询到19条相似文献,搜索用时 78 毫秒
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张丽虹 《微电子学与计算机》2012,29(9):171-174,178
针对传感器部署密度大、分布不均匀,DV-Hop定位算法误差大等问题,提出了一种改进DV-Hop的无线传感器节点定位算法.首先采用DV-Hop算法对未知传感器节点位置进行计算,然后在采用遗传算法对DV-Hop定位的误差进行修正.仿真结果表明,改进DV-Hop算法提高了节点的定位精度,降低定位的误差,更能真实地反映传感器网络节点的实际分布情况. 相似文献
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节点定位是无线传感器关键技术之一,针对固定多锚节点方法定位精度低的缺陷,为了提高无线传感器的定位精度,提出了一种基于改进单锚节点的无线传感器网络节点定位算法(SFOA-SVM)。首先采用单移动锚节点在无线传感器网络中移动,构建无线传感器定位模型的学习样本,然后采用SVM构建节点定位模型,并采用渔夫捕鱼算法模拟渔夫捕鱼行为找到最优SVM参数,最后采用仿真实验测试节点的定位性能。结果表明,相对于其它定位算法,SFOA-SVM提高了无线传感器节点的定位精度,具有一定的实际应用价值。 相似文献
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介绍了Monte Carlo(MCL)定位算法在无线传感网络节点定位中的应用,对MCL算法的位置估计、位置预测、位置滤波等方面进行了详细说明,针对算法中存在的初始位置不确定的问题进行了改进,并对算法进行了简化。 相似文献
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文章针对三维空间下固定锚节点在定位精度、成功率不高的问题,研究分析了基于RSSI算法的ERSS算法,提出了一种新的改进方法:利用移动锚节点采用特定移动轨迹并结合ERSS定位方法,修正了选取RSSI值时的合理性。针对边缘地区锚节点数量较少的情况,利用单一移动锚节点在空间内为圆柱体式旋转上升,平面上为以恒定角速度,自内而外逆时针旋转,周期性广播其坐标信息,从而确定未知锚节点的位置信息,同时利用ERSS算法,从而实现较为准确的定位。仿真结果表明,定位精度比未使用此方法的有了一定的提高。 相似文献
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《现代电子技术》2016,(24)
由于传感器网络节点容易受到干扰,传统的无线传感器网络节点定位系统无法对预定位信息进行有效控制,定位精度和定位效率均不高,故设计定位精度和定位效率均较高的无线传感网络节点定位系统。该系统利用CC2430芯片控制全局,对复位电路、调试电路和串口电路进行重点改进。CC2430芯片利用差分控制方法对系统运行中产生的预定位信息进行控制,获取预定位物体的最终定位信息。复位电路对传入系统的预定位物体信息进行分类,将预定位信息实时传输至串口电路,其自身状态信息将传输至调试电路。调试电路对复位电路中的电流和元件能耗进行调试,保障复位电路的正常运行。串口电路通过协调器与CC2430芯片连接,实现预定位信息向CC2430芯片的高效、精准传输。软件给出系统定位函数,以及虚拟测量计算方法的定位流程图。实验结果表明所设计的系统拥有较高的定位精度和定位效率。 相似文献
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一种降低定位误差的无线传感器网络节点定位改进算法 总被引:5,自引:0,他引:5
本文针对无线传感器网络节点的定位精度问题,提出了一种采用误差修正的方法来降低累积距离误差和定位误差的传感器网络节点定位改进算法,给出了该算法的基本原理与实现方法.该算法在不增加原算法通信量及计算复杂度的基础上提高了定位精度.仿真结果显示,在同等条件下,本文提出的算法定位精度提高了5~10%. 相似文献
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无线传感器网络LEACH改进算法的设计与仿真 总被引:5,自引:0,他引:5
在众多的无线传感器网络分簇路由协议中,低功耗自适应分簇(Low Energy Adaptive Clustering Hierarchy,LEACH)算法是其中比较流行的协议之一,但它并没有考虑到每个节点的能量状态,而且最优簇首数一旦确定,整个网络通信期间不再改变,因而不能更有效地提高网络的生存时间.文章在LEACH协议的基础上提出了一种改进的高能效无线传感器网络协议-EECRP(an Energy Efficient Cluster Routing Protocol).仿真结果表明,与LEACH相比,EECRP具有更好的能量有效性,并且提高了无线传感器网络的寿命. 相似文献
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As a special type of wireless sensor network, the chain‐type wireless sensor networks can be used to monitor narrow and long regions, such as roads, underground mine tunnels, rivers, and bridges. In this study, a perpendicular bisector division (PB) method was first presented, in which the location may be divided into more location sub‐areas by a perpendicular bisector of each of two location nodes. Compared with the triangulation division method in Approximate Point‐in‐Triangulation Test (APIT), the computable complexity of PB is lower, and the number of division areas is larger. Furthermore, in order to locate targets under rare location nodes, a virtual location node‐perpendicular bisector division (VPB) was presented by a virtual location node based on the geographic shape of the monitored area. Virtual location nodes increase the density of location nodes, which can improve the accuracy of the location in the location algorithm. Second, two range‐free location algorithms were proposed: the location algorithm based on PB (LAPB) and the location algorithm based on VPB (LAVPB). In the end, the location errors performance of APIT, LAPB, and LAVPB for locating miners in an underground mine tunnel was tested. The results show that LAPB and LAVPB have higher location accuracy and are more robust than APIT. LAVPB is more suitable for locating targets in harsh environments. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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To balancing energy consumption in wireless sensor networks, we proposed a fixed time interval node broadcasting scheme under variational acceleration straight-line movement model. Simulation results show that the approach proposed in this paper has a superior performance on energy consumption balance compared to uniform broadcasting methods. 相似文献
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Relative location estimation in wireless sensor networks 总被引:15,自引:0,他引:15
Patwari N. Hero A.O. III Perkins M. Correal N.S. O'Dea R.J. 《Signal Processing, IEEE Transactions on》2003,51(8):2137-2148
Self-configuration in wireless sensor networks is a general class of estimation problems that we study via the Cramer-Rao bound (CRB). Specifically, we consider sensor location estimation when sensors measure received signal strength (RSS) or time-of-arrival (TOA) between themselves and neighboring sensors. A small fraction of sensors in the network have a known location, whereas the remaining locations must be estimated. We derive CRBs and maximum-likelihood estimators (MLEs) under Gaussian and log-normal models for the TOA and RSS measurements, respectively. An extensive TOA and RSS measurement campaign in an indoor office area illustrates MLE performance. Finally, relative location estimation algorithms are implemented in a wireless sensor network testbed and deployed in indoor and outdoor environments. The measurements and testbed experiments demonstrate 1-m RMS location errors using TOA, and 1- to 2-m RMS location errors using RSS. 相似文献