共查询到19条相似文献，搜索用时 984 毫秒
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该课题讨论了在非屏蔽双绞线上采用电流型脉冲信号传输方式，以克服核料位计在信号远距离传输中易受电磁辐射干扰和信号畸变的问题。使仪器能在被测物料所处环境恶劣(高温、高压、腐蚀等)的情况下，准确、稳定、可靠地进行测量。 相似文献
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单片机系统主要由信号检测部分、信号处理及控制部分、控制信号驱动部分、系统交互部分、显示部分组成。干扰的种类主要来自系统内部元器件在系统中的状态和系统外部其它电气设备产生的干扰。硬件抗干扰措施是电源的抗干扰设计,屏蔽抗干扰技术,双绞线及光纤的使用,去耦电路。软件抗干扰措施是出错处理程序,建立软件陷阱,使用空操作指令。 相似文献
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单片机系统主要由信号检测部分、信号处理及控制部分、控制信号驱动部分、系统交互部分、显示部分组成。干扰的种类主要来自系统内部元器件在系统中的状态和系统外部其它电气设备产生的干扰。硬件抗干扰措施是电源的抗干扰设计,屏蔽抗干扰技术,双绞线及光纤的使用,去耦电路。软件抗干扰措施是出错处理程序,建立软件陷阱,使用空操作指令。 相似文献
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数字信号已进入了现代社会的各个领域,同模拟信号传输相比,数字信号传输有很大的变化。本文简要阐述了数字信号无线传输特性,以及无线信道对信号的影响,提出了信道改善的途径。 相似文献
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戴琳峰 《科技成果管理与研究》2009,(6):56-58,63
方案研究并使用了GPRS和嵌入式技术,以实现对输油管道远程防盗监控。使用ARM、嵌入式linux以及应力传感器来构建输油管道壁应力信号采集、处理平台,使用GPRS网络发送处理的检测数据。该方案省去了无线测控网络的搭建,支持检测平台上复杂信号处理,具备分布式系统具备的优点,因此具有极高的应用价值。 相似文献
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Event-triggered robust practical output regulation of linear systems with non-vanishing measurements
《Journal of The Franklin Institute》2023,360(8):5634-5657
This paper has studied the event-triggered robust output regulation for linear systems with non-vanishing measurements. A comprehensive event-triggered mechanism (ETM) is designed to determine the transmission instants of both sampling measurement signals and execution control signals. A kind of hybrid regulator has been proposed, consisting of a hybrid filter, observer, stabilizer, internal model, and compensator. Applying a generalized hold device makes the event-based regulator easy to implement. The proposed regulator and ETM achieve that all the closed-loop signals are bounded, and the regulated errors converge to a constant range, which can be adjusted arbitrarily small. 相似文献
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浅谈基于Zigbee技术的无线传感器网络的应用 总被引：1，自引：0，他引：1
Zigbee技术的出现为传感器信号的无线传输提供了新的解决方案。本文简单介绍了Zigbee技术及特点,列举了几种基于Zigbee技术的无线传感器网络的典型应用,分析基于Zigbee技术的无线传感器网络的发展趋势。 相似文献
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This paper proposes a new multiuser communication model in which a source with broadcast capabilities wants to transmit two different messages to two different destinations in the case that no direct links between the source and its destinations. In this channel model, two parallel half-duplex relays are used to extend the transmission. For this communication model, an outer bound to the achievable capacity is initially derived. Then, two distinctive transmission schemes are characterized such that the source can transmit to the two destinations. In each scheme, the transmission is split into two phases. Specifically, in the first phase, the source can broadcast different messages to the two relays. Then, in the second phase, the two relays can forward the source’s signals into their destinations. Based on the transmission on each scheme, the achievable rate region is characterized. Further, we derive the optimal duration of each phase. The theoretical analyses are followed by many numerical examples that compare between the different transmission techniques and also show the points at which the capacity is achieved. 相似文献
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架空输电线路铁塔结构是我国主要的输电方式,一旦发生损伤破坏将造成严重的经济损失。本文提出了一种基于随机森林的数据融合架空输电线路损伤识别方法。首先,采用多个传感器获取铁塔在不同损伤位置和程度上的振动加速度信号,并运用小波包对其进行多层分解;然后,将提取出来的各频带能量值构成特征向量输入到相应的随机森林进行训练和测试;最后,将多个随机森林分类器的次级决策进行数据融合,做出最终铁塔损失情况决策。应用该方法对500kV高压输电铁塔模型进行试验,并与单一分类器相比较。通过对实验数据的分析表明,该方法对铁塔损伤的识别效果优于单一RF分类器,可以有效地改善单一分类器的识别能力。同时也表明该方法具有较好的分类效果和容错能力。 相似文献
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Frederick E. Thau 《Journal of The Franklin Institute》1977,303(5):473-481
A decentralized stochastic control problem is solved for a linear system with two local controllers that exchange their control signals by transmission over noisy communication links. Each local controller contains a subsystem that approximately reconstructs the system state. A deterministic version of this problem is also considered. In each case expressions are presented for the performance of the controlled system. 相似文献
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无线射频识别技术,是一种非接触的自动识别技术,其基本原理是利用射频信号和空间耦合传输特性实现对物体的识别。本文面向欲了解RFID的基本工作方式、系统模块以及在供应链上应用的技术人员和商务人员。最后希望这篇文章能够帮助读者扫清RFID中的疑问和盲点。 相似文献