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Research on location Characteristics and algorithms based on Frequency Domain for a 2D Underwater Active Electrolocation Positioning System

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Journal of Bionic Engineering 2017年第4期14卷 759-769页

作者： Jiegang Peng Yue Zhu Tao Yong School of Automation Engineering and Center for Robotics University of Electronic Science and Technology of China Chengdu 611731 China

Weakly electric fish has an ability to generate a low-frequency electric field actively to locate the surrounding object in complete darkness by sensing the change of the electric field. This ability is called active electrolocation. In this paper, we designed a two-dimensional （2D） experimental platform of underwater active electrolocation system by simulating weakly electric fish. On the platform, location characteristics based on frequency domain were investigated. Results indicated that surface shape of 3D location characteristic curves for the 2D underwater active electrolocation positioning system was convex upwards or concave down which was influenced by the material of probed objects and the frequency of the electric field exci- tation signal. Experiments also confirmed that the amplitude of the electric field excitation signal and the size of the probed object will only influence the amplitude corresponding to 3D location characteristic curves. Based on above location charac- teristics, we present three location algorithms including Cross location Algorithm （CLA）, Stochastic location Algorithm （SLA） and Particle Swarm Optimization （PSO） location algorithm in frequency domain and achieved the task of the underwater positioning system. Our work may have reference value for underwater detection study.

关键词： underwater active electrolocation location characteristics location algorithms frequency domain bionics

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algorithms for Estimating the location of Remote Nodes Using Smartphones

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IEEE ACCESS 2019年 7卷 33713-33727页

作者： Pedro, Dario Tomic, Slavisa Bernardo, Luis Beko, Marko Oliveira, Rodolfo Dinis, Rui Pinto, Paulo Amaral, P. Inst Telecomunicacoes P-1049001 Lisbon Portugal COPELABS ULHT P-1749024 Lisbon Portugal Univ Nova Lisboa Fac Ciencias & Tecnol Dept Engn Electrotecn P-2829516 Caparica Portugal Univ Nova Lisboa P-2829516 Caparica Portugal

Locating the position of a remote node on a wireless network is becoming more relevant, as we move forward in the Internet of things and in autonomous vehicles. This paper proposes a new system to implement the location of remote nodes. A new prototype Android application has been developed to collect real measurements and to study the performance of several smartphone's sensors and location algorithms, including an innovative one, based on the second order cone programming (SOCP) relaxation. The application collects the WiFi access points information and the terminal location. An internal odometry module developed for the prototype is used when Android's service is unavailable. This paper compares the performance of existing location estimators given in closed form, an existing SOCP one, and the new SOCP location estimator proposed, which has reduced complexity. An algorithm to merge measurements from non-identical terminals is also proposed. Cooperative and terminal stand-alone operations are compared, showing a higher performance for SOCP-based ones, that are capable of estimating the path loss exponent and the transmission power. The heterogeneous terminals were also used in the tests. Our results show that the accurate positioning of static remote entities can be achieved using a single smartphone. On the other hand, the accurate real-time positioning of the mobile terminal is provided when three or more scattered terminal nodes cooperate sharing the samples taken synchronously.

关键词： Indoor location odometry localizing remote nodes without known anchors location algorithms cooperative localization android applications

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Partial Discharge Monitoring of Dry Distribution Transformer Based on Grid Search Scheme and Characteristic Analysis 4th

Partial Discharge Monitoring of Dry Distribution Transformer...

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4th International Forum on Smart Grid Protection and Control (Purple Mountain Forum)

作者： Chen, Yang Pubugou Power Plant Yaan City 625304 Sichuan Peoples R China

ISBN: (纸本)9789811397790;9789811397783

In this paper, a partial discharge location model of power transformer is proposed, and the solution method of partial discharge fault location equation is studied. The location accuracy analysis considering time difference, sensor position and sound velocity measurement error satisfying different probability distributions is also presented. A new location algorithm based on grid search is proposed, the algorithm has high positioning accuracy, but its calculation is too large. Through the simulation analysis of MATLAB programming, compared with the previous algorithm, the improvement measures for the new algorithm are proposed.

关键词： Partial discharge location accuracy location algorithms Simulation analysis Improvement measures

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A New Method of Three-Dimensional location for Low-Frequency Electric Field Detection Array

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JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 2018年第16期123卷 8792-8812页

作者： Fan, X. P. Zhang, Y. J. Zheng, D. Zhang, Y. Lyu, W. T. Liu, H. Y. Xu, L. T. Chinese Acad Meteorol Sci State Key Lab Severe Weather Beijing Peoples R China Univ Chinese Acad Sci Coll Earth Sci Beijing Peoples R China Fudan Univ Inst Atmospher Sci Shanghai Peoples R China Shanghai Inst Pollut Control & Ecol Secur Shanghai Peoples R China

We introduce the empirical mode decomposition algorithm and applied low-frequency filtering and high-frequency noise reduction to the waveform of the electric field changes recorded in 1-ms segments. This algorithm greatly improved the accuracy of the peak time extraction and the number of pulses in the low and very low frequency band, which enhanced the accuracy in positioning the pulse of the electric field change. Compared with the previous algorithm, the algorithm can significantly reduce the time error, giving a better positioning result. With a time error estimate of 100 ns and a limit of goodness of fit less than 5, the number of pulse locations is increased by nearly 7 times. The goodness-of-fit distribution of the pulse location results had a normal distribution, and the 95% confidence interval of goodness of fit was 0-4;the corresponding positioning space error was <60 m. The continuity of the lightning channel was significantly improved, and the development characteristics and fine structure of the lightning channel were clearly distinguished. The low-frequency electric field detection array system gave detailed positioning results for a bolt from the blue lightning strike. By comparing the results from the low-frequency electric field detection array with the actual lightning strike point, we objectively demonstrated the positioning performance of the new algorithm. The system gave positioning results for the lightning for all seven return strokes. The maximum horizontal distance between the locating point and the real lightning strike point was 57 m, the minimum horizontal distance between them was 3 m, and the mean distance was 27 m.

关键词： bolt from the blue empirical mode decomposition error analysis lightning detection location algorithms low‐frequency electric field detection array

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Localization of static remote devices using smartphones 87

Localization of static remote devices using smartphones

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87th IEEE Vehicular Technology Conference (VTC-Spring)

作者： Pedro, D. Tomic, S. Bernardo, L. Beko, M. Oliveira, R. Dinis, R. Pinto, P. Univ Nova Lisboa FCT DEE P-2829516 Caparica Portugal Inst Telecomunicacoes Lisbon Portugal IST Inst Syst & Robot Lisbon Portugal FCT UNL UNINOVA CTS Caparica Portugal Univ Lusofona Humanidades & Tecnol CICANT CIC DIGITAL Lisbon Portugal

ISBN: (纸本)9781538663554

Vehicles need to locate other vehicles and network infrastructure elements on unmanned autonomous vehicle (UAV) systems. Human passengers also need to locate and be located by the vehicles, preferentially using a portable device, such as a smartphone. This paper analyses the accuracy of several localization algorithms in the remote location of entities running WiFi access points, using measurements collected in moving vehicles using a new application developed by us. The algorithms analysed include closed form estimators and one based on second order cone programming (SOCP) relaxation, which exhibits the best accuracy and is capable of estimating the path loss exponent and the transmission power. Although, due its lower complexity, the Levenberg-Marquardt algorithm was better suited for the stand-alone Android prototype application. The results show that real-time accurate positioning of static/slow moving remote entities is possible, even though the accuracy degrades when the measuring vehicle's speed increases.(1)

关键词： location algorithms WiFi localization Vehicular-based performance evaluation Android application

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An Improved Centroid Localization algorithm for WSN

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INTERNATIONAL JOURNAL OF FUTURE GENERATION COMMUNICATION AND NETWORKING 2015年第6期8卷 93-98页

作者： Li ShiWei Ding Mingli Zhao YongPing Heilongjiang Univ Dept Informat Sci & Technol Harbin 150086 Peoples R China Harbin Inst Technol Dept Automat Test & Control Harbin 150001 Peoples R China

In wireless sensor networks (WSN) research area, node localization is one of the most important techniques. An improved Centroid localization algorithm is analyzed and an improved Centroid algorithm with selective anchor node localization algorithm (CSA) for WSN will proposed in this paper. The key point of the algorithm is the most discrepant estimation nodes are selected by the nearest reference anchor node around a distance unknown node. The triangle centroid and the polygon centroid are employed to calculate the coordinates of the estimation nodes to improve node locating precision. MATLAB simulation illustrate that the algorithm is valid and feasible.

关键词： location algorithms Range-free locating centroid location algorithm Wireless Sensor Networks (WSN)

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Multichannel Acquisition System and Denoising for the Detection and location of Partial Discharges using Acoustic Emissions

Multichannel Acquisition System and Denoising for the Detect...

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IEEE International Instrumentation and Measurement Technology Conference

作者： Iago Bua Nunez Julio E. Posada Roman Jesus Rubio Serrano Jose A. Garcia-Souto Department of Electronics Technology GOTL Universidad Carlos III de Madrid Leganes Madrid Spain

ISBN: (纸本)9781467346214

In this paper an instrumentation system with multichannel acquisition and denoising is described and characterized for detecting and locating acoustic emissions from partial discharges in oil. A fiber optic immersed sensor and four external ultrasonic piezoelectric sensors where used in this implementation. A signal processing system based on the use of digital denoising techniques and location algorithms implemented with virtual instrumentation is proposed. Finally, an experimental platform of acoustic testing is used to characterize the performance of the instrumentation system with different types of signals and S/N ratios.

关键词： Multichannel Instrumentation System Acoustic Emission Partial Discharge Denoising PXI LabVIEW Fiber Optic Sensor location algorithms

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Evaluation of an RSSI-based location Algorithm for Wireless Sensor Networks

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IEEE LATIN AMERICA TRANSACTIONS 2011年第1期9卷 830-835页

作者： Gracioli, G. Froehlich, A. A. Pires, R. P. Wanner, L. Univ Fed Santa Catarina Dept Informat & Estat Florianopolis SC Brazil Univ Calif Los Angeles Lab Sistemas Embarcados & Redes Los Angeles CA USA

Position awareness is a desirable feature for many applications of Wireless Sensor Networks. The Received Signal Strength Indication (RSSI) of a radio channel provides a feasible way of estimating distance between nodes because its use does not require any additional hardware but only a radio transceiver. The main drawback of using RSSI is its instability and interference susceptibleness noticed in real environments. This work presents an evaluation of the HECOPS implementation, a location algorithm for wireless sensor networks that uses RSSI to determine the distance among nodes in an efficient way. Based on the analysis of the HECOPS behavior in practice, this paper proposes to change the way that the distance among nodes are estimated. The proposal consists in using the mean of the last n estimatives, instead of using only the RSSI value in the moment that the information are received, as in the original algorithm. The results show that, with this change, HECOPS has obtained an improvement of up to 100% in terms of reliability in the nodes position estimation.

关键词： Wireless Sensor Networks location algorithms Embedded Systems Ad Hoc Networks

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Modeling of handover counting and location management for wireless mobile networks

Modeling of handover counting and location management for wi...

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Conference on Next-Generation Communication and Sensor Networks 2007

作者： Rodriguez-Dagnino, Ramon M. Takagi, Hideaki Tecnol Monterrey Ctr Elect & Telecomunicac Sucursal Correos J Monterrey 64849 NL Mexico Univ Tsukuba Grad Sch Syst & Informat Engn Tsukuba Ibaraki 3058573 Japan

ISBN: (纸本)9780819469335

Handover (or handoff) management is the set of actions that allows a wireless network to maintain a mobile user's connection as it moves through different cells during a call. The handover is typically done during a cell boundary crossing and all of the mobile terminal's connection information must be transferred into the new cell (or new base station). So, it is important to count the number of handovers made by a user during a call for proper network resources dimensioning and performance prediction. location management is the set of actions aimed to find the current location of an inactive mobile user for call delivery. It implies the transmission of signaling messages for dynamic databases updates, paging, and so on. This problem is formulated in terms of cost optimization and it is mathematically related to handover counting. In this paper, we summarize many of the proposed model to deal with these problems, and we will be mainly focussed on the renewal process approach.

关键词： handovers location algorithms movement-based renewal theory

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