检索结果-内蒙古大学图书馆

UWB impulse radio signal detection with high-speed integrated comparator

Information technology Journal 2008年第3期7卷 516-521页

作者： Zhang, Wenhui Lin, Jiming School of Computer and Control Guilin University of Electronic Technology Guilin 541004 China School of Information and Communication Engineering Guilin University of Electronic Technology Guilin 541004 China

This study presents an apparatus for detecting Ultra Wide-Band (UWB) impulse radio (IR) signals using circuit with a normal ultra-high-speed integrated comparator, which having nonlinear dynamics characteristics with the same N-shaped I-V characteristic as tunnel diode. This circuit is configured to generate amplified pulse in response to incoming weak UWB impulse radio signals by utilizing the negative resistance region of the I-V characteristic with differential input. It can provide higher symbol rate than correlation detector and is more stable, more feasible and less complicated than the tunnel diode detector. The experiment results indicate that the detecting sensitivity of this apparatus is approximate to that of the tunnel diode detector. © 2008 Asian Network for Scientific Information.

关键词： Impulse noise

来源：评论

学校读者我要写书评

暂无评论

A novel active power measuring method for power systems with distorted signals

A novel active power measuring method for power systems with...

引用

International Conference on Information and Automation (ICIA)

作者： Xiao-Bing Zhang Yuan-Hua Liang Jia-Rui Cui School of Measurement-Control Tech and Communications Engineering Harbin University of Science and Technology Harbin Heilongjiang China School of Information Engineering University of Science and Technology Beijing Beijing China

With the application of nonlinear loads and impulse loads, base-wave Watt meters can not be applied to the power systems with these loads. For example, in 2006, ChangSha power company, HuNan, China, imported many base-wave Watt meters to measure the active power consumed by large factories. A mass measured results by these meters have shown that almost 30% of the electric energy consumed were not recorded by the meters. Clearly, the cost is huge. Based on this point, we analyze the shortcoming of the base-wave Watt meter first. Then a novel active power measuring method which can solve this problem very well is presented. Finally, the simulation results verify the effectiveness of the method and show that the method has a very good referential value and practical value for raising the level of the existing electric energy measurement.

关键词： Power systems Power system harmonics Harmonic analysis Distortion Power measurement Distortion measurement Voltage measurement

来源：评论

学校读者我要写书评

暂无评论

Slide Mode Variable Structure control for BLDC Electric Actuator

Slide Mode Variable Structure Control for BLDC Electric Actu...

引用

7th World Congress on Intelligent control and Automation (WCICA 2008), vol.19

作者： Zhiyuan Yu Xiaoxian Yao Zheng Liu School of AeroSpace Science and Engineering Beijing Institute of Technology Beijing China AeroSpace Measurement Control Corporation Beijing China

Slide mode variable structure control method is used for designing a digital controller of BLDC electric actuator in this paper. Firstly, the mathematic model of electric actuator is built according to the selected BLDC motor. Secondly, two slide mode algorithms, proportion switching algorithm and velocity trending law algorithm, are designed for the electric actuation system. Thirdly, we design a DSP digital controller using the sliding mode variable structure control algorithms. Fourthly, the system simulation and experiment are carried out. Based on results, we get the rule about the influence on the system performance by selecting different parameters. Experiments are made in the sequence and could well validate the results of simulation. Finally, we discuss the characteristics of the two algorithms, and summarize the method to design a slide mode variable structure controller for BLDC electric actuator.

关键词： Electric actuator Sliding mode BLDC motor

来源：评论

学校读者我要写书评

暂无评论

A Method for Spherical Localization Using Modified Hough Transform

A Method for Spherical Localization Using Modified Hough Tra...

引用

International Symposium on Intelligent Information technology Application, IITA

作者： He Guang-lin Huang Ke-wei Yuan Ben-sheng Department of Mechatronics Engineering School of Aerospace and Science Technology Beijing Institute of Technology Beijing China Department of Measurement and Control Technologies School of Information Engineering University of Science and Technology Beijing Beijing China

Two image sensors simulate directly the way of disposing images with the humanpsilas two eyes, so it has important value to apply to many domains, such as object identify, UAV detection, robot navigation, and so on. This paper focus on the object localization and distance detection based on two image sensors. It concentrates on how to apply two CCD image sensors to object localization of a sphere in complex environments. A space model of the two image sensors was set up, then an experiment platform was built in order to prove the correctness and feasibility of that localization algorithm, and the relationship between the coordinate localization accuracy and the sensor structural parameters was analyzed.

关键词： Image sensors Object detection Eyes Unmanned aerial vehicles Robot sensing systems Robot kinematics Orbital robotics Navigation Charge-coupled image sensors Structural engineering

来源：评论

学校读者我要写书评

暂无评论

A new design approach for Safety Critical Distributed control System

A new design approach for Safety Critical Distributed Contro...

引用

IEEE International Conference on Automation and Logistics

作者： Yuefei Wang Jianghong Han Qingxin Hu School of Computer and Information School of Mechanical and Automobile Engineering Engineering Research Center of Measurement and Control in Safety Critical Industry Ministry of Education Hefei University of Technology Hefei Anhui China School of Computer and Information Engineering Research Center of Measurement and Control in Safety Critical Industry Ministry of Education Hefei University of Technology Hefei Anhui China

ISBN: (纸本)9781424425020

In terms of the design of SCDCS (Safety Critical Distributed control System), MATI (Maximum Allowable Transfer Interval) is one of the important design reference parameters that influences message transmission period and network scheduling strategy. To obtain its upper bound, Lyapunov theory and matrix measure are applied to analyze SCDCS which is networked only in its feedback path, and a sufficient condition is induced which can guarantee that the SCDCS is asymptotically stable. Furthermore, an explicit and simple method of obtaining MATI for SCDCS is derived on the base of that stable condition. The simulation validates the method and shows that the method is much less conservative than the existing methods.

关键词： Safety Equations control systems Educational institutions Distributed control Computers Continuous time systems

来源：评论

学校读者我要写书评

暂无评论

Finite support 2-D FIR QMF PR filter bank design by spectral factorization using Gröbner basis

Finite support 2-D FIR QMF PR filter bank design by spectral...

引用

Asia-Pacific Conference on communications

作者： A. Thamrongmas C. Charoenlarpnopparut Electronics and Communication Engineering Program School of Communications Instrumentations & Control Sirindhorn International Institute of Technology Thammasat University Thailand

In this paper, the application of spectral factorization by using Grobner basis approach to the problem of 2-D finite support QMF filter bank design is proposed along with illustrative example. Earlier, it has been shown that the Grobner basis can be applied to solve the problem of 2-D factorization and its effectiveness in dealing with polynomial equation system are demonstrated. Despite the fact that there exist many good techniques for designing one dimensional QMF synthesis and analysis filter banks, the two-dimensional counterpart has a major bottleneck due to the generalization of 2-D spectral factorization. The proposed algorithm is the direct generalization of the 1-D QMF filter bank design by spectral factorization. Furthermore, the filter coefficients can be computed in symbolic forms and thus provide a good opportunity for further optimization if additional criteria are given.

关键词： Finite impulse response filter Filter bank OFDM Video coding Resource management Base stations Broadcasting Frequency synchronization Interchannel interference Wireless communication

来源：评论

学校读者我要写书评

暂无评论

Analysis of networked estimation under contention-based medium access

引用

IFAC Proceedings Volumes 2008年第2期41卷 10283-10288页

作者： Maben Rabi Luca Stabellini Peter Almström Mikael Johansson Automatic Control Lab School of Electrical Engineering Royal Institute of Technology (KTH) Osquldas väg 10 SE-100 44 Stockholm Sweden Department of Communication Systems School of Information and communication Technology Royal Institute of Technology (KTH) Electrum 418 SE-164 40 Kista Sweden

We investigate the scalability of networked estimation under contention-based medium access. In our set-up, the state of a number of identical first-order linear plants are measured and transmitted over a shared medium. Each sensor transmits its readings to a supervisor node that maintains a continuous-time state estimate for the associated plant. When the medium access delay exceeds the sampling interval, measurements are discarded and replaced by more recent ones. Our analysis of the shared channel determines the probability of packet loss as a function of the sampling interval and the number of contending nodes. We compute the estimation distortion with periodically generated samples as a function of the packet loss rate and sampling interval, and derive a condition for stable estimator performance. We investigate the scalability limits of this stability as a function of the number of nodes. When stable estimation is possible, we provide a procedure that computes the sampling rate that minimizes the average estimation distortion. We reproduce the analysis of estimation performance when the sensors sample asynchronously according to independent Poisson counters.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Mobile Robot based Odor Path Estimation via Dynamic Window Approach

Mobile Robot based Odor Path Estimation via Dynamic Window A...

引用

IEEE Conference on Robotics, Automation and Mechatronics

作者： Ji-Gong Li Qing-Hao Meng Fei Li Ming-Lu Zhang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China School of Mechanical Engineering Hebei University of Technology Tianjin China

This paper addresses the problem of estimating the odor path which is most likely taken by the odor patch detected by the concentration sensor on a mobile robot moving in an indoor dynamic airflow environment. The odor path estimation is useful for plume tracing and odor source declaration. A novel algorithm for odor path likelihood mapping in the dynamic airflow environment is proposed. The algorithm has a low computation cost by importing the idea of dynamic window approach. Experiments are carried out on the mobile robot in which odor concentration sensor, airflow sensor, encoder and compass are equipped. To extract useable concentration information from the odor sensor, a practicable data preprocessing method is put forward. The experiment results in the indoor dynamic airflow environment show that the odor path can be well estimated online.

关键词： Mobile robots Animals Vehicle dynamics Robot sensing systems Wireless sensor networks Life estimation Algorithm design and analysis Hidden Markov models Delay Mechanical engineering

来源：评论

学校读者我要写书评

暂无评论

Modeling of Fermentation Process Based on QDPSO-SVM

Modeling of Fermentation Process Based on QDPSO-SVM

引用

International Conference on Natural Computation (ICNC)

作者： Xianfang Wang Jindong Chen Zhou Wu Feng Pan Henan Institute of Science and Technology Xinxiang Henan China School of Communication and Control Engineering Jiangnan University Wuxi Jiangsu China

Utilizing the ability simple in application and quick in convergence of quantum delta-potential-well-based particle swarm optimization (QDPSO) algorithm and the high generalization ability of support vector machine (SVM), selecting the appropriate state variables, a dynamic time-varying model has been built. Using the model and algorithm to per-estimate some biochemical state variables which can not be measured on-line, and to optimise some operational variables. It is proved that the method is efficiency through the practical application of penicillin fermentation process.

关键词： Support vector machines Particle swarm optimization Network topology Evolutionary computation Convergence Computational modeling control engineering Appropriate technology Electronic mail Biomass

来源：评论

学校读者我要写书评

暂无评论

Research on Multisensor State Fusion Estimation Based on Weighted Least Squares

Research on Multisensor State Fusion Estimation Based on Wei...

引用

International Symposium on Intelligent Information technology Application, IITA

作者： Peiyi Zhu Benlian Xu Baoguo Xu Department of Automation Changshu Institute of Technology Changshu Jiangsu China School of Communication and Control Engineering Jiangnan University Wuxi Jiangsu China

In the measuring process, some even several sensors expire, but other non-expiration sensor can't affect to provide the information independently. The system can depend on the information by non-expiration sensor providing to get accurate observed value. The paper analyzes the metrical data based on sensor management, and selects a group of sensors according to qualification, and data of the limited measurement by the group multi-sensors were state fusion estimated. The obtaining measurement results are more accurate than arithmetic mean value algorithm. At last eliminates the disturbance and the uncertainty in the sensor survey, and obtains is more accurate, the more reliable measurement result..

关键词： State estimation Least squares approximation Sensor fusion Sensor systems and applications Sensor systems Noise measurement Working environment noise Arithmetic Sensor phenomena and characterization Information technology

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：