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RSS Assisted TOA-Based Indoor Geolocation

INTERNATIONAL JOURNAL OF WIRELESS INFORMATION NETWORKS 2013年第2期20卷 157-165页

作者： He, Jie Yu, Yanwei Wang, Qin Univ Sci & Technol Beijing Sch Comp & Commun Engn Beijing Peoples R China

The huge distance measurement error in indoor areas and the difficulty of error estimation have posed great challenges to the design of practical TOA-based indoor geolocation systems. In this paper, we presented an RSS assisted TOA-based indoor localization algorithm, which uses RSS to estimate the range of DME for reference node selection and position estimation. This algorithm effectively improves the accuracy of distance measurement and position estimation, and thus improve the localization accuracy of the system. The algorithm is applied into a practical TOA-based indoor geolocation system, developed based on a commercially available device. The results of performance evaluation in a typical office environment show that the localization accuracy of our proposed algorithm is better than the conventional algorithms.

关键词： Indoor geolocation system TOA RSS localization algorithm

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A Window-Adaptive Centroiding Method Based on Energy Iteration for Spot Target localization

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2022年 71卷 1页

作者： Bao, Jingyu Zhan, Haiyang Sun, Ting Fu, Sheng Xing, Fei You, Zheng Tsinghua Univ Beijing Adv Innovat Ctr Integrated Circuits Dept Precis Instrument Beijing 100084 Peoples R China Tsinghua Univ State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China Beijing Informat Sci & Technol Univ Joint Int Res Lab Adv Photon & Elect Beijing 100192 Peoples R China

The random noise of complementary metal-oxide-semiconductor (CMOS) image sensor is the main factor limiting the further improvement of high-accuracy spot target detection. Accordingly, a window-adaptive centroiding method based on energy iteration is proposed in this article. The method can effectively mitigate the problem of localization performance fluctuations caused by the random noise at the low-intensity pixels within the extraction window. By analyzing the centroiding error model and the random noise of CMOS detectors, simulations are used to deduce that pixel response random noise that remains after removing systematic errors is the main factor limiting further improvement in positioning accuracy. Based on the generally applicable threshold centroiding algorithm, the influence of the pixel response within the extraction window on the centroiding accuracy is derived according to the pixel energy and the pixel location relative to the target centroid. This leads to an iterative method, which combines the pixels with better performance as a new extraction window and recalculates the target centroid. The effectiveness of the algorithm at the signal-to-noise ratio (SNR) typical for real cases is simulated and analyzed. An experimental scheme is designed for the subpixel movement of point targets with a measurement platform based on a high-precision rotary table and a star tracker to validate our algorithm. Further real star experiment is conducted to verify the effectiveness of the algorithm. The results of the experiments indicate that the proposed method can reduce the random noise effect on spot extraction accuracy.

关键词： Detectors Stars Location awareness Target tracking Semiconductor device modeling Systematics Instruments localization algorithm optical instrumentations optical measurement space instrumentations

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Sybil Attack Detection and Analysis of Energy Consumption in Cluster Based Sensor Networks

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INTERNATIONAL JOURNAL OF GRID AND DISTRIBUTED COMPUTING 2014年第5期7卷 15-30页

作者： Saxena, Sweety Sejwar, Vikas Madhav Inst Sci & Technol Dept CSE IT Gwalior MP India

Wireless Sensor Network is an emerging new technology extensively used for large-scale real-time data processing due to its characteristics and is used in application areas such as in civilian and military domains. These networks are vulnerable to several security attacks. In this paper, we emphasize on Sybil attack, which is a harmful threat to sensor networks and proposed an algorithm for Sybil attack detection based on Time difference of Arrival (TDOA) localization method, which detects the malicious behavior of the head node and member nodes in a cluster based network.

关键词： localization algorithm TDOA RSSI Sybil attack LEACH

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Relative and Absolute Positioning in Ultra Dense Mems System 16

Relative and Absolute Positioning in Ultra Dense Mems System

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IEEE International Conference on Computer and Information Technology (CIT)

作者： Moffo, Dermas Canalda, Philippe Spies, Francois Univ Bourgogne Franche Comte FEMTO ST Inst CNRS F-25200 Montbeliard France

ISBN: (纸本)9781509043149

Mems Microrobot applications evolve in ultra-dense contexts. They are at the stage of the simulation to obtain 2-Dimension or shapes for the deployment of individual or collective intelligent programs, and collectively achieve miniaturized and flexible workshops. Now-on, manufacturers and academicians projects are at the stage of modeling and prototyping Mems, and simulating Mems systems applications. To tackle these objectives, addressing individual positioning of Mems inside very dense micro-systems becomes strategic. In many situations, it is more useful to know the relative positioning between Mems and their orientation, than the knowledge of absolute positioning of each Mems. Works achieved on microrobots micropositioning are either stochastic or deterministic. The formers are based on proba-bilistic approaches, that provides better results on a small scale but produce greater error accumulation with a large sample. The latters are based on geometric considerations to accurately compute the position of each Mems, and then distribute it to all the elements. We propose a model of a smart-grid (orthogonal and hexagonal lattice) of microrobots with regular geometry, and their connectors (actuators and sensors for moves and other actions) communicating by contact. Based on this model, we propose a mixed positioning algorithm (absolute and relative) in 2D without mobility of Mems in a group ranging in size from thousands to millions of items, based only on neighborly relations. Then by simulation we perform a functional validation of our algorithm, and a validation of the scalability of our algorithm on orthogonal grid of over 1 million node.

关键词： 2D Micro-localization relative and global positioning Micro-systems localization algorithm simulation

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Summary of Research on localization of Hazardous Gas Leakage Source

International Core Journal of Engineering

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International Core Journal of Engineering 2022年第1期8卷 25-37页

作者： Boya Ma Jinqing Liu Jinchao Xiao Jihai Liu

The occurrence of dangerous gas leakage accidents is an important issue faced by the public and society. For example, the leakage of liquefied natural gas, hydrogen and other gases will cause explosion accidents, and the leakage of toxic gases such as ammonia, chlorine, and hydrogen sulfide will lead to poisoning, even suffocation accidents. Therefore, in order to minimize casualties and losses, determining the source of accidental leakage is the primary task; and in the case of accidental leakage, timely and effectively locating the source of gas leakage plays a vital role in emergency rescue. Thus, relevant investigations on the location of gas leakage sources at home and abroad have been carried out, the preliminary process about the location of dangerous gas leakage sources has been introduced: the diffusion model when gas leaks, leak detection technology, the method of obtaining positioning data--sensor arrangement. Meanwhile, common algorithms for gas source localization are introduced from two aspects about active olfactory locating and static gas source locating. Finally, a summary and prospect of the localization algorithm are given.

关键词： Hazardous Gas Diffusion Model Leak Detection Sensor localization algorithm

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Outdoor Wireless Healthcare Monitoring System for Hospital Patients based on ZigBee

Outdoor Wireless Healthcare Monitoring System for Hospital P...

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5th IEEE Conference on Industrial Electronics and Applications

作者： Xu, Xiaoxin Wu, Mingguang Ding, Cheng Sun, Bin Zhang, Jiangwei Zhejiang Univ Dept Control Sci & Engn Hangzhou 310003 Zhejiang Peoples R China Hangzhou Meacon Automat Technol Co Ltd Hangzhou Peoples R China China JiLiang Univ Thermal Engn Res Inst Hangzhou Peoples R China

ISBN: (纸本)9781424450466

Advances in embedded computing systems have resulted in the emergence of Wireless Sensor Networks (WSNs), which provide unique opportunities for sensing physical environment of our daily lives. ZigBee-compliant WSN platforms have been proposed for Healthcare monitoring, smart home, industrial monitoring and sensor, and other applications. In this paper, we using TI CC2430 and CC2431 chipsets with Z-Stack designed an outdoor patients' healthcare monitoring system, for tracking patients, and helping doctors and nurses to keep tabs on their patients' health remotely. Furthermore, several important techniques are elaborated, including reliable communication, localization algorithm and backup power, which can enhance the system performance. Finally, presented some suggestions for future development are presented by us.

关键词： ZigBee wireless monitoring system reliable data transmission localization algorithm power supply

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Optimization of UAV-Femtocell Systems Positioning via Game Theory to Geolocate Mobile Terminals in a Post-Earthquake Scenario 11

Optimization of UAV-Femtocell Systems Positioning via Game T...

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11th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems - Technology and Applications (IDAACS)

作者： Avanzato, Roberta Beritelli, Francesco Raciti, Fabio Spataro, Enrica Univ Catania DIEEI Dept Elect Elect & Comp Sci Engn Viale Andrea Doria 6 I-95125 Catania Italy Univ Catania DMI Dept Dept Math & Comp Sci Viale Andrea Doria 6 I-95125 Catania Italy

ISBN: (纸本)9781665426053

The use of UAV-Femtocell systems for the geolocation of mobile terminals has recently been introduced in the literature as an alternative and effective method in civil protection scenarios and applications. In this context, one of the important aspects concerns the optimization of geolocation times, bearing in mind the limited duration of the flight time of drones. This paper proposes a game theory-based approach to geolocation using UAV-Femtocell systems. A game structure is proposed in which the rules of drone movement are defined according to criteria and utility functions that are linked to the power measurements of the mobile terminals and obtained by the UAV-Femtocell systems in order to optimize the geolocation process through a series of successive rounds in which the Nash equilibria are reached.

关键词： localization algorithm UAVs Game Theory Flight Strategy and Energy Efficiency Optimization

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Lamb waves Direction of Arrival estimation based on wavelet decomposition

Lamb waves Direction of Arrival estimation based on wavelet ...

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IEEE International Ultrasonics Symposium (IUS)

作者： Malatesta, Michelangelo Maria Testoni, Nicola De Marchi, Luca Marzani, Alessandro ARCES I-40123 Bologna Italy DEI Dept Elect Elect & Informat I-40136 Bologna Italy DICAM Dept Civil Chem Environm & Mat Engn I-40136 Bologna Italy

ISBN: (纸本)9781728145969

Guided waves in Structural Health Monitoring permit to detect different types of damage inside a structure, such as cracks, as well as external impacts. A precise localisation of the damage or the impact point is necessary in order to improve the reliability and accuracy of monitoring approaches. A localisation algorithm based on the estimation of the waves Direction of Arrival (DoA) by means of a DFT-Based Continuous Wavelet Transform decomposition is presented in this work. The approach exploits a multiresolution DFT-Based CWT decomposition applied to the signals acquired by cluster of three piezoelectric (PZT) transducers in 60 degrees configuration. The multiple frequency-based filtering of the signals in the wavelet domain counteracts the complexity caused by the dispersive characteristics of the material. Subsequently the cross-correlation method and the angle estimation are applied for each computed scale. Finally, the Direction of Arrival is computed by an averaging procedure across scales. The approach is validated by means of an experimental setup. The results show the accuracy of the proposed algorithm, enabling to estimate the DoA with an average error of 1.15 degrees and a maximum error of 1.74 degrees.

关键词： SHM GWs localization algorithm wavelet decomposition

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Two-Leveled Obstacle Avoidance Scheme Using a Kinematically Redundant Omni-directional Mobile Robot

Two-Leveled Obstacle Avoidance Scheme Using a Kinematically ...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Jung, Eui-Jung Kim, Sung Mok Yi, Byung-Ju Kim, Whee Kuk Hanyang Univ Sch Elect Engn & Comp Sci Seoul South Korea Korea Univ Dept Control & Instrumentat Syst Seoul South Korea

ISBN: (纸本)9781424466757

This work presents the kinematic modeling and motion planning algorithm for an omni-directional mobile robot with kinematic redundancy. This robot consists of three wheel mechanisms each of which has one redundant joint as compared to the operational degrees. Initially, the kinematic modeling of this robot is conducted. Next, using such a kinematic redundancy of each chain, several motion planning algorithms are suggested. A localization algorithm of the mobile robot based on odometry is presented and specifically, two-leveled obstacle avoidance scheme, which simultaneously considers both large and small obstacles, is presented. The usefulness of the proposed algorithms is verified through simulation.

关键词： collision avoidance distance measurement kinematically redundant omnidirectional mobile robot localization algorithm mobile robots motion control motion planning odometry redundant joint robot kinematics two-leveled obstacle avoidance wheel wheels

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On Computation of Distributed Supervisory Controllers in Discrete-Event Systems

On Computation of Distributed Supervisory Controllers in Dis...

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24th Chinese Control and Decision Conference (CCDC)

作者： Zhang Renyuan Gan Yongmei Wang Zhaoan Wonham, W. M. Xi An Jiao Tong Univ Sch Elect Engn Xian 710049 Shaanxi Peoples R China Univ Toronto Dept Elect & Comp Engn Toronto ON M5S3G4 Canada

ISBN: (纸本)9781457720727

This paper refines an earlier localization procedure used to design optimal nonblocking distributed supervisory controllers in discrete-event systems (DES). The earlier algorithm needed a control consistency relation involving two conditions, and introduced superfluous selfloops. We propose a refined procedure, including a newly defined weak control consistency relation, and a cleanup algorithm, which results in simpler and cleaner controllers. It is proved to be correct, and illustrated by a Transfer Line plant.

关键词： Distributed supervisory controller localization algorithm discrete-event system

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