共查询到19条相似文献,搜索用时 125 毫秒
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针对外场设备测试环境的特殊性和实时性要求,对设备间的信号采集与传输,提出了一种结合无线传输技术和机敏传感网络技术的高精度多参数测量方法.重点阐述了无线传感嚣网络(ZigBee)拓扑结构协议设计思想,利用边界节点作为路由器起到簇与簇间的中继作用,实现簇间通信;以温度测量为例,给出了传感节点的设计方案,利用巴伦电路实现传感... 相似文献
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为了提高无线传感网络安全防护能力,需要进行网络安全防护路径设计,提出基于联合节点行为覆盖的无线传感网络安全防护路径激光追踪方法。构建无线传感网络安全防护路径的覆盖关系模型,根据传感器节点与目标节点从属关系进行无线传感网络安全防护的路径空间规划设计,采用最短路径寻优方法进行无线传感网络安全防护路径的激光控制,采用激光扫描和空间识别方法进行无线传感网络安全防护路径的联合节点路径寻优,在最优覆盖集下实现无线传感网络安全防护路径激光追踪识别。仿真结果表明,采用该方法进行无线传感网络安全防护路径激光追踪的拟合度较高,无线传感网络的负载均衡性和鲁棒性均有提升。 相似文献
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为对地磁传感节点进行低功耗设计,采用动态功率管理的方法减少地磁传感节点各部分电路的功耗,另一方面,尽量减少无线传输单元的接收时间来降低地磁传感节点进行数据传输时的功耗.对这两种降低功耗的方法进行了实验对比验证,实验表明,本文设计的地磁传感节点功耗降低了80%,有效降低了传感网络节点的功耗. 相似文献
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针对无线传感网预覆盖过程中存在覆盖盲区以及数据频繁重传而导致的节点覆盖抑制现象,提出了一种基于拨备满足模型的无线传感网网络覆盖算法。设计一种新的无线传感网节点覆盖模型,并构建覆盖指数、覆盖强度、覆盖均衡评估系数等评估维度,快速评估节点覆盖质量。再计算覆盖均衡评估系数,并采用拨备模型优化覆盖质量,确定覆盖性能优越的备用工作节点。随后,基于覆盖相似性原则评估工作节点覆盖性能,设计了节点首次覆盖评估方法,按节点移动路径依次评估覆盖指数统计均值,并根据目标节点进入覆盖区域的先后,逐次激活性能最佳的工作节点进行监测。仿真实验表明:与当前无线传感网常数节点覆盖方案相比,所提方案具有更高的网络覆盖率、更短的覆盖启动时间和更少的工作节点数目。 相似文献
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Wireless smart sensing is now widely used in various applications such as health monitoring and structural monitoring. In conventional wireless sensor nodes, significant power is consumed in wirelessly transmitting the raw data. Smart sensing adds local intelligence to the sensor node and reduces the amount of wireless data transmission via on-node digital signal processing. While the total power consumption is reduced compared to conventional wireless sensing, the power consumption of the digital processing becomes as dominant as wireless data transmission. This paper reviews the state-of-the-art energy-efficient digital and wireless IC design techniques for reducing the power consumption of the wireless smart sensor node to prolong battery life and enable self-powered applications. 相似文献
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Motivated by chaos technology and compressed sensing, we propose a distributed secure data collection scheme via chaotic compressed sensing in wireless sensor networks. The chaotic compressed sensing is applied to the encrypted compression of sensory data for sensor node and the data acquisition for whole sensory in wireless sensor networks. The proposed scheme is suitable for long-term and large scale wireless sensor networks with energy efficiency, network lifetime and security. A sensing matrix generation algorithm and active node matrix algorithm based on chaos sequence are proposed to ensure the secure and efficient transmission of sensor packets. The secret key crack, forgery, hijack jamming and replay attacks on the proposed algorithm are evaluated to show the robustness of this scheme. Simulations and real data examples are also given to show that the proposed scheme can ensure the secure data acquisition in wireless sensor networks efficiently. 相似文献
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环境振动状况监测对设备的安全运营至关重要。通过压电振动能量采集器可实现对环境振动信息的感知,再经过智能信息处理方法无线监测设施的安全运营状态。将无线传感与深度学习相结合,在充分研究压电振动能量采集器输出信号特征的基础上,提出了优化的卷积神经网络模型,用于识别环境异常振动模式,并设计实现了智能感知无线监测传感节点。系统工作时,节点可监测环境振动、温度信息并报警异常事件。测试结果表明, 该传感节点在无线传输距离超过100 m 的情况下,实现了环境振动事件的实时监测,报警时间小于5 s,环境振动模式识别准确率可达95.7%,监测环境温度状况并准确报警异常燃烧事件的时间小于3.7 s。该节点在野外目标监测等场合有广泛的应用前景。 相似文献
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基于DSP和双目视觉的多媒体传感器网络节点设计与实现 总被引:2,自引:0,他引:2
针对无线传感器网络对于多媒体信息获取的实际需求,以高性能DSP处理器为核心,结合ZigBee无线通信,设计实现了新型多媒体无线传感器节点。借助DSP的强大运算能力和外设接口,在多媒体节点上配置了双目摄像机、加速度计等传感器,实现了环境信息和图像数据的实时感知与获取,并依托ZigBee协议形成了室内环境短距无线通信与监测能力。实验结果表明,所设计的多媒体传感器节点能够准确、实时地进行综合感知数据的获取与处理,满足无线多媒体传感器网络的应用需求。 相似文献
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Location and calculation-free node-scheduling schemes in large wireless sensor networks 总被引:1,自引:0,他引:1
In wireless sensor networks that consist of a large number of low-power, short-lived, unreliable sensors, one of the main design challenges is to obtain long system lifetime without sacrificing system original performance (sensing coverage and sensing reliability). To solve this problem, one of the potential approaches is to identify redundant nodes at the sensing interface and then assign them an off-duty operation mode that has lower energy consumption than the normal on-duty mode. In our previous work [J. Wireless Commun. Mobile Comput. 3 (2003) 271; Processing of ACM Wireless Sensor Network and Application Workshop 2002, September 2002], we proposed a node-scheduling scheme, which can provide a 100% sensing coverage preservation capability. This, however, requires each node to be aware of its own and its neighbors’ location information. Also, in that scheme, each node has to do accurate geometrical calculation to determine whether to take an off-duty status. In this paper, we propose and study several alternative node-scheduling schemes, which cannot completely preserve the original system coverage, but are nonetheless light-weighted and flexible compared with the previous one. Our simulation results compare these schemes with the previous one and demonstrate their effectiveness. 相似文献
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基于感知距离调节的无线传感器网络节能区域覆盖 总被引:4,自引:1,他引:3
传感器节点能够感知的物理世界的最远距离称为节点的感知距离。该文研究了基于节点感知距离调节的无线传感器网络节能区域覆盖方案,该方案通过设定合理的节点感知距离,使得传感器网络在满足区域覆盖要求的同时,能量消耗最低。首先将区域覆盖性能和网络能量消耗模化成网络节点感知距离的函数,然后将节能覆盖问题模化成带约束条件的优化问题,最后给出了基于网络区域划分的优化模型求解方法。仿真结果表明,与传统覆盖方案比较,所提方案在满足覆盖要求的同时,有效降低了网络能量消耗。 相似文献