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40th International Conference on Telecommunications and Signal Processing (TSP)

作者： Czapiewska, Agnieszka Gdansk Univ Technol Fac Elect Telecommun & Informat Dept Radiocommun Syst & Networks Gdansk Poland

ISBN: (纸本)9781509039821

In the paper a new indoor positioning algorithm is presented. This algorithm takes into account selected features of radio wave propagation in indoor environment. This results in improvement in accuracy of calculated position estimates. A comparative analysis of this new algorithm with Chan and Foy algorithms was made and described in the paper. This comparative analysis was made with utilization of real radio distance measurements.

关键词： Chan algorithm Foy algorithm indoor environment positioning algorithms radiolocalization

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Decentralized network assembly for positioning and coordination of ad hoc networks 2

Decentralized network assembly for positioning and coordinat...

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Conference on SPIE Disruptive Technologies in Information Sciences II

作者： Kraczek, Brent CCDEVCOM Army Res Lab Attn FCDD RLC HC 328 Hopkins Rd Aberdeen Proving Ground MD 21005 USA

ISBN: (数字)9781510626928

ISBN: (纸本)9781510626928

The battlefield of the future is projected to include regions with high-densities of small, networked devices. As a step toward developing decentralized, multi-path routing protocols for these scenarios, we consider the geometric problem of assembling a geographic representation of the network based solely on information about relative positions of local neighbors. We present two algorithms to be used in series. 1. The assembly of the network from relative positions only. 2. The determination of the geographic extents of the network, and the position of each node within those extents. With this information, the nodes can then assemble a position-based routing protocol, such as the Ad Hoc On-Demand Distance Vector (AODV) routing protocol. We further consider the effects of positional noise on the accuracy of the constructed geography.

关键词： Distributed network assembly positioning algorithms

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Spatial positioning and Annotations for Dissemination of Information 3

Spatial Positioning and Annotations for Dissemination of Inf...

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3rd International Conference on Smart Generation Computing, Communication and Networking, SMART GENCON 2023

作者： Hebbar, Surya Raghavendra Achar, C. Maradithaya, Sumana Mittal, Rashi Sudeep, C.K. Ramaiah Institute of Technology Department of Information Science and Engineering Bengaluru India

ISBN: (纸本)9798350319125

The paper provides an architecture for building a computational infrastructure with embedded and remote data repositories to facilitate dissemination of information through annotations. This expedites the users ability to provide and retrieve real-time information on recent events in their locale. The approach utilizes processing of architectural floor plans, GPS coordinates, IMU sensor values and WiFi RSSI values to extrapolate a different set of spatial coordinates, to display 2-dimensional and 3-dimensional annotations on synthetic blueprints(2D maps) and captured video frames respectively(AR). Commodity hardware present on smartphones possess afore-mentioned instrumentation and the required computational power, providing the ability to disseminate information during real-time events in institutions, museums, libraries, hospitals, marketplaces, airports and construction sites. © 2023 IEEE.

关键词： 2D Maps Accelerometer Android Canvas Libraries Android SensorManager Libraries Android WifiManager Libraries AR Architectural floor plan Augmented Reality Dead Reckoning DWG DXF Embedded Databases ExpressJS Floor blueprint GLB GLIF Google AR Core Google Filament Libraries Gyro-scope Image Processing IMU sensors MariaDB Navigation algorithms NodeJS OCR Optical Character Recognition PNG positioning algorithms Servers SQLite Tesseract WiFi WiFi RSSI values

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High-Resolution Direct Position Determination Using MVDR

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2016年第9期15卷 6449-6461页

作者： Tzafri, Liran Weiss, Anthony J. Tel Aviv Univ Sch Elect Engn IL-6997801 Tel Aviv Israel

The direct position determination (DPD) approach is a single-step method, which uses the maximum likelihood estimator to localize sources emitting electromagnetic energy using combined data from all available sensors. The DPD is known to outperform the traditional two-step methods under low signal-to-noise ratio conditions. We propose an improvement to the DPD approach, using the well-known minimum-variance-distortionless-response (MVDR) approach. Unlike maximum likelihood, the number of sources needs not be known before applying the method. The combination of both the direct approach and MVDR yields unprecedented localization accuracy and resolution for weak sources. We demonstrate this approach on the problem of multistatic radar, but the method can easily be extended to general localization problems.

关键词： positioning algorithms adaptive array processing minimum variance distortionless response (MVDR) maximum likelihood estimation direct position determination

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Least squares algorithms for time-of-arrival-based mobile location

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2004年第4期52卷 1121-1128页

作者： Cheung, KW So, HC Ma, WK Chan, YT City Univ Hong Kong Dept Comp Engn & Informat Technol Kowloon Hong Kong Peoples R China Univ Melbourne Dept Elect & Elect Engn Parkville Vic 3052 Australia Chinese Univ Hong Kong Dept Elect Engn Shatin Hong Kong Peoples R China

Localization of mobile phones is of considerable interest in wireless communications. In this correspondence, two algorithms are developed for accurate mobile location using the time-of-arrival measurements of the signal from the mobile station received at three or more base stations. The first algorithm is an unconstrained least squares (LS) estimator that has implementation simplicity. The second algorithm solves a nonconvex constrained weighted least squares (CWLS) problem for improving estimation accuracy. It is shown that the CWLS estimator yields better performance than the LS method and achieves both the Cramer-Rao lower bound and the optimal circular error probability at sufficiently high signal-to-noise ratio conditions.

关键词： mobile terminals positioning algorithms time-of-arrival

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One-to-one non-linear transformation for RSS-based localization with unknown transmit power

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IET COMMUNICATIONS 2021年第4期15卷 627-641页

作者： Danaee, Meysam Raees Imam Hussein Comprehens Univ Elect Engn Dept 3rd Floor 303 Tehran Iran

For most of the positioning algorithms, based on the received signal strength, the objective function of the estimator is linearized so that the conventional least square algorithm can be executed. This would necessitate using a data model containing many noisy elements which implicitly violates the least squares assumptions. To avoid this violation, an optimized data modelling would have to be set up as shown in this paper. The authors then trivially provide the solution of this new least square problem which is still a primary coarse position estimation because of ignoring the non-linear relationships existing among parameters of the estimation. To extract quantitative information from these non-linear relationships, the authors also propose two new signal space points for using Taylor-series expansion as effectively as possible in accordance of the new data model. The proposed algorithms work without any knowledge about the transmit power. The performance evaluation of the proposed idea indicates that the new suggested estimators perform significantly better than the other existing linear position estimators for a large range of noise variance and path-loss exponent values.

关键词： WSN Taylor-series expansion RSS-based localization sensor placement Optimisation techniques Signal processing and detection Wireless sensor networks optimized data modelling signal space points least square algorithm primary coarse position estimation least squares approximations positioning algorithms one-to-one nonlinear transformation wireless sensor networks Interpolation and function approximation (numerical analysis) objective function linear position estimators signal processing nonlinear relationships least square problem received signal strength

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Covariance shaping least-squares location estimation using TOA measurements

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2007年第3期E90A卷 691-693页

作者： Chang, Ann-Chen Chung, Chin-Min Ling Tung Univ Dept Informat Technol Taichung 408 Taiwan Commun Elect & Informat Div Tao Yuan 335 Taiwan

Localization of mobile terminals has received considerable attention in wireless communications. In this letter, we present a covariance shaping least squares (CSLS) estimator using time-of-arrival measurements of the signal from the mobile station received at three or more base stations. It is shown that the CSLS estimator yields better performance than the other LS estimators at low signal-to-noise ratio conditions.

关键词： mobile terminal positioning algorithms time-of-arrival covariance shaping least-squares

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Overview on the development and applications of antenna control systems

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ANNUAL REVIEWS IN CONTROL 2016年 41卷 47-57页

作者： Mulla, A. A. Vasambekar, P. N. Yashwantrao Chavan Coll Sci Dept Elect Karad 415124 India Shivaji Univ Dept Elect Kolhapur 416004 Maharashtra India

During last three decades, the antenna control systems have been extensively developed, studied and applied in several satellite communication systems. While tracking the signal source, these systems play an important role in the alignment of antenna coordinates at receiving end. It is always needed to receive strongest, best quality and environmental effect free signal, transmitted by the transmitter. The speed, accuracy, power;cost and size are the important parameters of antenna control system. The number of control systems implement standard algorithms PI, PD, PID, PIDA, fuzzy, self-tuned fuzzy, LQG, Hos, genetic, neural network and their combinations. Many researchers developed manual, differential, monopulse, electronic, auto-tracking, left-right, conical and step tracking methods to track signal source. In this paper the developments and applications of the antenna control systems are reviewed. The system performances of the implemented standard algorithms and tracking methods in antenna control system are discussed. The simulated and experimental results show that the advancements in algorithms have reduced major issues and increased performance of the systems. The performance is also improved with the combinations of tracking methods and/or algorithms. (C) 2016 International Federation of Automatic Control. Published by Elsevier Ltd. All rights reserved.

关键词： positioning control Tracking control positioning algorithms Antenna robust control Antenna tracking system Antenna positioning system

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Cooperative Surface/Underwater Navigation for AUV Path following missions

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IFAC-PapersOnLine 2016年第23期49卷 355-360页

作者： Nad, Dula Ribeiro, Miguel Silva, Henrique Ribeiro, Jorge Abreu, Pedro Miskovic, Nikola Pascoal, Antonio Faculty of Electrical Engineering and Computing University of Zagreb Zagreb10000 Croatia Portugal

The paper presents acoustic navigation aiding and path following results from demonstration experiments in Lisbon, Portugal. The demonstration was carried out as part of the second year CADDY Review Meeting. The paper presents the concept of the underwater leader, which entails an underwater vehicle, performing a desired task, and a surface vehicle maintaining relative position to improve navigation aiding through acoustics. The surface controller, utilizing the artificial potential field method, is proposed as an alternative to classical tracking and positioning controllers. Even in presence of multiple agents, the controller offers a more “relaxed” tracking and positioning algorithm for autonomous vehicles. The acoustic data-exchange scheme, required to achieve situation awareness of all agents, is described to specify cycle times and delays that have to be taken into account during state estimation. Finally, results from public demonstrations are presented and analyzed both from the surface and underwater perspectives. © 2016

关键词： Underwater acoustics Autonomous agents Controllers Demonstrations Electronic data interchange Mobile robots Multi agent systems Navigation Robots Target tracking Vehicles Acoustic navigation Artificial potential field method Autonomous Vehicles Marine systems Path following positioning algorithms Surface controllers Underwater vehicles

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Visual Marker based Multi-Sensor Fusion State Estimation

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IFAC-PapersOnLine 2017年第1期50卷 16003-16008页

作者： Sanchez-Lopez, Jose Luis Arellano-Quintana, Victor Tognon, Marco Campoy, Pascual Franchi, Antonio Madrid Spain ESIME-UA National Polytechnic Institute Mexico City Mexico LAAS-CNRS Université de Toulouse CNRS Toulouse France

This paper presents the description and experimental results of a versatile Visual Marker based Multi-Sensor Fusion State Estimation that allows to combine a variable optional number of sensors and positioning algorithms in a loosely-coupling fashion, incorporating visual markers to increase its performances. This technique allows an aerial robot to navigate in different environments and carrying out different missions with the same state estimation architecture, exploiting the best from every sensor. The state estimation algorithm has been successfully tested controlling a quadrotor equipped with an extra IMU and a RGB camera used only to detect visual markers. The entire framework runs on an onboard computer, including the controllers and the proposed state estimator. The whole software is made publicly available to the scientific community through an open source implementation. © 2017

关键词： Visual servoing Air navigation Antennas Image sensors Navigation Open source software Open systems State estimation Autonomous Mobile Robot Inertial sensor Open source implementation Position estimation positioning algorithms Scientific community Sensor fusion State estimation algorithms

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