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Asian control Conference

作者： Xiaoli Li Yugeng Xi School of Information Science and Technology Donghua Uinversity Shanghai China Department of Automation Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Jiaotong University Shanghai China

Cooperative control of multi-agent system has been extensively discussed for groups with single-layer topology. This paper is unfolded from the problem of consensus and discusses how to decompose a single-layer topology into layers of connected subgraphs to improve the cooperative performance of group. A hierarchical decomposition algorithm is developed to split the topology into hierarchy. On the premise that each agent can only interact with its neighbors restricted by the original topology of system, performing consensus within the hierarchical structure obtained by our algorithm will yield the fastest convergence when compared with running consensus on original single-layer topology or other hierarchical structures. This paper also presents a connection between topological structure of group and the global performance in cooperative control.

关键词： Laplace equations Topology Eigenvalues and eigenfunctions Periodic structures Convergence Time measurement Multiagent systems

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A New Electronic Reconnaissance Technology for MIMO Radar

A New Electronic Reconnaissance Technology for MIMO Radar

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2011 IEEE CIE International Conference on Radar(2011年IEEE国际雷达会议RADAR 2011)

作者： Jun Tang Xiaowei Tang Bo Tang Zhaozhao Gao Xin Bi Jinsong Du Department of Electronic Engineering Tsinghua University Beijing 100084 Electronic Engineering Institute Hefei 230037 National Information Control Laboratory Key Laboratory of Liaoning Province on Radar System&Application

MIMO (multiple-input multiple-output) radar has been recently introduced as an important new radar system which emits orthogonal waveforms to cover a wide surveillance space. Therefore, the electronic reconnaissance technology for MIMO radar is of great significance in the future war. In this paper, a new electronic reconnaissance mode and identification algorithm for MIMO radar is proposed. In detail, a single reconnaissance aircraft is used to fly along a circumference of suspicious radar, collecting radiated signals on multiple positions. Furthermore, the collected data is analyzed and the number of orthogonal waveforms is estimated to detect and discriminate whether it’s a MIMO radar. Studies show that the wider angle range the reconnaissance aircraft flies by, the better the estimation results will be. Accurate estimates can be achieved when the flying angle exceeds a certain threshold. In addition, the reconnaissance aircraft requires a longer flight when MIMO radar uses more orthogonal waveforms or the signal-to-noise ratio (SNR) is relatively low.

关键词： MIMO Radar orthogonal waveforms electronic reconnaissance source number estimation

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Change detection based on iterative invariant area histogram matching

Change detection based on iterative invariant area histogram...

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International Conference on Geoinformatics

作者： Zhengwei Yang Wei Zhang Wei Wang Qiongcheng Xu NASS Research and Development Division USDA Fairfax VA USA Department of Automatic Control and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Jiaotong University Shanghai China

ISBN: (纸本)9781612848495

Image radiometric distortion is problematic to many remote sensing based image change detection methods. Thus image radiometric normalization is critical to successful change detection and other image analysis. Histogram matching (HM) method has been widely used for radiometric normalization. However, when two corresponding image scenes have partial changes, these changes will introduce additional distortions in the histogram matching process. Obviously, if the change areas in the images can be excluded from histogram matching, the distortions in histogram matching will be avoided. Thus, a novel, iterative change detection based HM normalization algorithm is proposed in this paper. The algorithm of the proposed iterative invariant area histogram matching and an adaptive thresholding schema are first introduced, and the change detection experiment results are then presented. The preliminary results indicate that the proposed method significantly improves the performance of change detection for a given threshold as judged by visual inspection.

关键词： Iterative change detection Iterative radiometric normalization Histogram matching Invariant area

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Model Predictive control system Based on FPGA and A Case Study

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IFAC Proceedings Volumes 2011年第1期44卷 9266-9271页

作者： Nan Yang Dewei Li Jun Zhang Yugeng Xi Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Shanghai 200240 Joint Institute of UMich-SJTU Shanghai Jiao Tong University Shanghai 200240 China

Abstract Model predictive control (MPC) algorithm has been widely applied in industry process control systems since last century, like petro-refining and other chemical processes. However, it is rarely used in field controllers due to the complexity of online optimization. This paper introduces a new MPC system based on the field programmable gate array (FPGA) chip. In order to make MPC controller more efficient, a hybrid way is adopted to design the quadratic programming (QP) solver on the FPGA chip. Thus, the controller can solve the optimization problem of MPC in a pretty short time. The whole control system is implemented on a Virtex-4 FPGA chip and applied to the angle servo control of two motors with a satisfactory result. The experiment shows that it is possible to apply MPC algorithm in field controller by the proposed design.

关键词： FPGA model predictive control field controller motor servo

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Subspace identification using the saturation measurement in data-driven control systems

Subspace identification using the saturation measurement in ...

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Asian control Conference

作者： Yongling Wu Shaoyuan Li Hua Yang Department of Automation Key Laboratory of System Control and Information Processing Ministry of Education Shanghai Jiaotong University Shanghai China College of Information Science and Engineering Ocean University of China Qingdao Shandong China

ISBN: (纸本)9781612844879

Saturation characteristic exists widely in the real system, and a large number of articles have taken constraint conditions into account during the controller design process. However, relative to the research on the input (actuator) saturation, study on the output (sensor) saturation has not been taken seriously and research results are very little, especially in the aspect of effect on the identification due to the saturation output. In this paper, under the data-driven control system based on online subspace identification and model predictive control (MPC) method, the relationship among the output saturation step, prediction horizon and subspace matrix is obtained, while the change of the system information is unknown because the output signals are locked. Finally, a simulation example is given to demonstrate the correction of the conclusion.

关键词： Predictive models Matrix decomposition Mathematical model Predictive control Actuators

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Estimation of Transition Range Bin in Clutter Edge for Space Time Adaptive processing

Estimation of Transition Range Bin in Clutter Edge for Space...

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2011 IEEE CIE International Conference on Radar(2011年IEEE国际雷达会议RADAR 2011)

作者： Bo Tang Yingning Peng Jun Tang Junjiang Lu National Key Laboratory of Information Control Technology for Communication System of China Departme Department of Electronic Engineering Tsinghua University Beijing 100084 People’s Republic of Chin

In this paper, clutter suppression and target detection in clutter edge is discussed. Firstly the statistical model of the clutter edge is established, based on which maximum likelihood estimation for the transition range bin of the clutter edge is derived. Simulations illustrate that by carefully choosing the secondary samples based on the estimation result of the transition range bin, the signal to inference plus noise ratio (SINR) can be improved significantly.

关键词： Space time adaptive processing (STAP) clutter edge estimation of the transition range bin

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Distributed coordination for connectivity-preserving flocking without velocity measurement

Distributed coordination for connectivity-preserving flockin...

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Asian control Conference

作者： Lin Wang Xiaofan Wang Xiaoming Hu Department of Automation Key Laboratory of System Control and Information Processing Shanghai Jiaotong University Shanghai China Optimization and Systems Theory Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)9781612844879

In this paper, we address the design of decentralized controller for connectivity-preserving flocking without velocity measurement. An output vector based on neighbors' position information alone is constructed to replace the role of velocity, then some bounded attractive and repulsive forces are integrated together to design the controller. Under some initial conditions, we prove that the controller not only can synchronize all agents, but also can avoid collision as well as preserving connectivity among agents for all the time. Moreover, a leader-follower method is used to guide the group to a desired direction, where the neighboring relationship is totally determined by the distance.

关键词： Algorithm design and analysis Velocity measurement Synchronization Symmetric matrices Lead Collision avoidance Position measurement

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RETRACTED ARTICLE: Improved particle swarm optimization algorithm with application in optimal reactive power planning of 10kV distribution system

RETRACTED ARTICLE: Improved particle swarm optimization algo...

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2011 7th International Conference on Natural Computation, ICNC 2011

作者： Wang, Chao Yao, Gang Zhou, Lidan Wang, Xin Zheng, Yihui Xu, Qingshan Center of Electrical and Electronic Technology Shanghai Jiao Tong University Shanghai 200240 China Department of Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China Key Laboratory of System Control and Information Processing Ministry of Education Shanghai 200240 China JiLin Electric Power Co. Ltd. JiLin 130021 China

ISBN: (纸本)9781424499533

The optimization of reactive power compensation plays an important role in power system planning and designing. A mathematical model in the 10kV distribution network will be established in this paper. Its objective function is the cost of investment in equipment of reactive power compensation and active power loss of the system should be the least. The node voltages beyond limited and the generator reactive power output beyond limited will be expressed in the way of penalty function. In this paper, the improved particle swarm optimization (improved PSO) will be used to solve the problem of easily falling into local optimum if using PSO. Using the improved PSO can be more effective in searching the global optimal solution, the speed of reactive power optimization will be improved too. The algorithm can better adapt to solve the problem. © 2011 IEEE.

关键词： Particle swarm optimization (PSO)

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Quantized Consensus for Agents on Digraphs

Quantized Consensus for Agents on Digraphs

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2011 Eighth International Conference on Fuzzy system and Knowledge Discovery(第八届模糊系统与知识发现国际会议 FSKD 2011)

作者： DequanLi QipengLiu Xiaofan Wang Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 Shanghai P.R.China

The available investigations about quantized average consensus typically assume agents be confined to evolve on balanced digraphs via quantized information exchange, thus the corresponding update matrices are doubly stochastic, which is very restrictive and brings about feasibility problem in practical applications. By dropping the doubly stochastic constraint for the update matrices, this paper studies the consensus seeking for a group of agents on general strongly connected digraphs, where agents' states are communicated (may be unidirectional) through logarithmic quantizer. Under mild assumptions on network topology, we derive an upper bound for the quantization precision to guarantee the weighted average preservation of the whole network.

关键词： consensus distributed algorithm multiagent systems quantization nonbalanced digraph

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Eigenvalue-based investigation of multi-agent system with logical dynamics

Eigenvalue-based investigation of multi-agent system with lo...

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World Congress on Intelligent control and Automation (WCICA)

作者： Lin Wang Xiaofan Wang Jinhuan Wang Department of Automation and Key Laboratory of System Control and Information Processing Ministry of Education Shanghai Jiaotong University Shanghai China School of Sciences Hebei University of Technology Tianjin China

In this paper, we study the limit set of multi-agent logical system via an algebraic method. We first show that such system can be converted into a linear system through an expansion of space. Then, we discuss the structure properties of system matrix and investigate the relationship between the eigenvalues and the limit set. As an application, the nilpotent problem of elementary cellular automata(ECA) known as algorithmically undecidable is considered, and all the nilpotent ECA are found out which consists of rules 0, 8, 64, 239, 253, 255.

关键词： Eigenvalues and eigenfunctions Automata Vectors Multiagent systems Manganese Matrix converters Linear systems

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