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Characterization of Direct localization algorithms for Ultrasound Super-Resolution Imaging in a Multibubble Environment: A Numerical and Experimental Study

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IEEE ACCESS 2022年 10卷 49991-49999页

作者： Xavier, Aline Alarcon, Hector Espindola, David Univ OHiggins Inst Ciencias Ingn Rancagua 2841959 Chile Pontificia Univ Catolica Chile Biomed Imaging Ctr Santiago 7820436 Chile

localization plays a significant role in the production of ultrasound localization microscopy images. For instance, detecting more microbubbles reduces the time of acquisition, while localizing them more accurately improves the resolution of the images. Previous approaches to compare the multiple localization algorithms rely on numerical simulation of a single steady microbubble, with or without modeling its nonlinear response. In real-life situations, vessels have a nonconstant velocity profile, which creates relative movement, producing dynamically overlapped microbubbles even at low concentrations. These complexities deteriorate the behavior of the localization algorithms. To incorporate these effects on the characterization of the localization methods, we designed a virtual medium containing four microtubes of different inner diameters, where single-pixel microbubbles were allowed to flow within each microtube with a parabolic velocity profile. A finite difference method was used to simulate the propagation of ultrasound waves to obtain B-mode images that fed four direct microbubbles localization algorithms (i.e., weighted centroid, 2D-spline interpolation, parabolic fitting, and onset detection). The performance of these methods was quantified using the number of microbubbles detected, the microbubbles distribution, the full width at half maximum, the maximum velocity, and the computational time as metrics. Our simulation results suggest that 2D-spline and paraboloid fitting were the best methods, detecting 100% of the microbubbles with an error in their distribution of 249 and 244 microbubbles, respectively. Both methods with a computational time cost of 18% and 7% lower than weighted centroid, respectively. We also present an experimental comparison of these localization methods, finding results similar to the numerical ones.

关键词： Location awareness Ultrasonic imaging Superresolution Numerical models Standards Splines (mathematics) Radio frequency FullWave simulations localization algorithms microvessel imaging ultrasound localization microscopy ultrasound super-resolution

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A survey on deployment techniques, localization algorithms, and research challenges for underwater acoustic sensor networks

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2017年第17期30卷 e3350.1-e3350.1页

作者： Tuna, Gurkan Gungor, V. Cagri Trakya Univ Dept Comp Programming TR-22020 Edirne Turkey Abdullah Gul Univ Dept Comp Engn TR-38039 Kayseri Turkey

In recent years, wireless sensor networks (WSNs) have attracted the attention of both the research community and the industry, and this has eventually lead to the widespread use of WSNs in various applications. The significant advancements in WSNs and the advantages brought by WSNs have also enabled the rapid development of underwater acoustic sensor networks (UASNs). In UASNs, in addition to deployment, determining the locations of underwater sensor nodes after they have been deployed is important since it plays a critical role in many applications. Various localization techniques have been proposed for UASNs, and each one is suitable for specific scenarios and has unique challenges. In this paper, after presenting an overview of potential UASN applications, a survey of the deployment techniques and localization algorithms for UASNs has been presented based on their major advantages and disadvantages. Finally, research challenges and open research issues of UASNs have been discussed to provide an insight into future research opportunities.

关键词： deployment techniques localization algorithms potential applications research challenges underwater acoustic sensor networks

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localization algorithms for multilateration (MLAT) systems in airport surface surveillance

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SIGNAL IMAGE AND VIDEO PROCESSING 2015年第7期9卷 1549-1558页

作者： Mantilla-Gaviria, Ivan A. Leonardi, Mauro Galati, Gaspare Balbastre-Tejedor, Juan V. Univ Politecn Valencia Inst ITACA Valencia 46022 Spain Univ Roma Tor Vergata DIE I-00133 Rome Italy

We present a general scheme for analyzing the performance of a generic localization algorithm for multilateration (MLAT) systems (or for other distributed sensor, passive localization technology). MLAT systems are used for airport surface surveillance and are based on time difference of arrival measurements of Mode S signals (replies and 1,090 MHz extended squitter, or 1090ES). In the paper, we propose to consider a localization algorithm as composed of two components: a data model and a numerical method, both being properly defined and described. In this way, the performance of the localization algorithm can be related to the proper combination of statistical and numerical performances. We present and review a set of data models and numerical methods that can describe most localization algorithms. We also select a set of existing localization algorithms that can be considered as the most relevant, and we describe them under the proposed classification. We show that the performance of any localization algorithm has two components, i.e., a statistical one and a numerical one. The statistical performance is related to providing unbiased and minimum variance solutions, while the numerical one is related to ensuring the convergence of the solution. Furthermore, we show that a robust localization (i.e., statistically and numerically efficient) strategy, for airport surface surveillance, has to be composed of two specific kind of algorithms. Finally, an accuracy analysis, by using real data, is performed for the analyzed algorithms;some general guidelines are drawn and conclusions are provided.

关键词： localization algorithms Multilateration Time difference of arrival Airport surface surveillance Air traffic control

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An Overview of localization algorithms in Mobile Wireless Sensor Networks

An Overview of Localization Algorithms in Mobile Wireless Se...

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International Conference on Protocol Engineering (ICPE) and International Conference on New Technologies of Distributed Systems (NTDS) (ICPE-NTDS)

作者： Khelifi, Manel Benyahia, Ilham Moussaoui, Samira Nait-Abdesselam, Farid UAMB Univ Doctoral Sch Comp Sci ReSyD Bejaia Algeria UQO Dept Comp Sci Outaouais PQ Canada USTHB Univ Dept Comp Sci Algiers Algeria Paris Descartes Univ LIPADE Paris France

ISBN: (纸本)9781467392655

localization problem in mobile wireless sensor networks has drawn widely attention in recent years due to the rapid advances in mobile computing and improvements of wireless communication technologies. Indeed, mobile sensor networks become a valuable asset for many applications, since sensors can be mobile or easily tethered to mobile entities such as robots, vehicles or human. Thereby, it is crucial to support mobility without compromising the quality of applications that require wireless communications. Although, numerous research activities have successfully addressed the localization problem in static networks, few studies deal with the localization issue in mobile sensor networks. In this paper, we present a survey on existing work in this area and we address the gaps for actual deployment of mobile wireless sensor networks. Following our analysis, we propose a classification of the most important algorithms and schemes that outcome from recent literature. We discuss their basic principles, characteristics and concepts. Finally, we point out open research issues, their challenges and some future directions for localization in mobile wireless sensor networks.

关键词： Mobile nodes localization algorithms Wireless Sensor Network Mobility forms and strategies

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localization algorithms Research in Wireless Sensor Network Based on Multilateration and Trilateration techniques 3

Localization Algorithms Research in Wireless Sensor Network ...

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3rd IEEE International Colloquium on Information Science and Technology (CIST)

作者： Asmaa, Labyad Hatim, Kharraz Aroussi Abdelaaiz, Mouloudi Ibn Tofail Univ Lab LaRIT Team Network & Telecommun Kenitra Morocco

ISBN: (纸本)9781479959792

Recently there has been much focus on Wireless sensor networks (WSN). However Location information is one of the most important information in WSN. Many location estimation algorithms for WSNs have been used to determine the sensor nodes position. In this paper, two different localization algorithms using Trilateration and Multilateration mathematical techniques have studied and compared according to the number of anchor nodes. Some conclusions that are extracted verified that increasing the Number of anchor nodes could enhance the accuracy of the mean location error of location algorithm based on Multilateration technique.

关键词： WSN localization algorithms Trilateration Multilateration Energy consumption Location error

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A comparative study of range based and range free algorithms for node localization in underwater

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e-Prime - Advances in Electrical Engineering, Electronics and Energy 2024年 9卷

作者： Nanthakumar, Sathish P․, Jothilakshmi Assistant Professor Department of Electronics and Communication Engineering Sri Venkateswara College of Engineering Sriperumbudur India Associate Professor Department of Electronics and Communication Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Chennai India

The exploration of underwater surfaces and their monitoring has become an emerging field of interest for many researchers. localization is a crucial task in the Underwater Wireless Sensor Network (UWSN). In comparison to terrestrial sensor nodes, localizing underwater sensor nodes is more difficult. In UWSN, the communication of signals between the nodes is a challenging task due to acoustic communication and the position of the node tends to move due to a strong water current in the deep sea whereas in terrestrial the nodes are static and the localization of the node is comparatively easier. Strategic surveillance relies on accurate localization in UWSN to follow underwater assets and activities. Addressing localization issues improves situational awareness, disaster response, and mitigation in crucial areas. We reviewed Range-Based and Range-Free UWSN localization algorithms from numerous research articles and discussed trade-offs and improvement opportunities. The comparative analysis was made based on various parameters like coverage area, density of node in the network, energy consumption, localization error and computational complexity. The performance comparison helps the researchers to decide the best localization algorithm or to improve the available algorithm for UWSN. © 2024 The Author(s)

关键词： localization algorithms Range-based localization Range-free localization Underwater wireless sensor networks

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localization algorithms of Wireless Sensor Networks: a survey

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TELECOMMUNICATION SYSTEMS 2013年第4期52卷 2419-2436页

作者： Han, Guangjie Xu, Huihui Duong, Trung Q. Jiang, Jinfang Hara, Takahiro Hohai Univ Dept Informat & Commun Syst Changzhou Peoples R China Blekinge Inst Technol Karlskrona Sweden Osaka Univ Dept Multimedia Engn Osaka Japan

In Wireless Sensor Networks (WSNs), localization is one of the most important technologies since it plays a critical role in many applications, e.g., target tracking. If the users cannot obtain the accurate location information, the related applications cannot be accomplished. The main idea in most localization methods is that some deployed nodes (landmarks) with known coordinates (e.g., GPS-equipped nodes) transmit beacons with their coordinates in order to help other nodes localize themselves. In general, the main localization algorithms are classified into two categories: range-based and range-free. In this paper, we reclassify the localization algorithms with a new perspective based on the mobility state of landmarks and unknown nodes, and present a detailed analysis of the representative localization algorithms. Moreover, we compare the existing localization algorithms and analyze the future research directions for the localization algorithms in WSNs.

关键词： Wireless Sensor Networks localization algorithms Mobility Location accuracy

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GALI - A GAmma-ray burst Localizing Instrument: Results from Full-Size Engineering Model

GALI - A GAmma-ray burst Localizing Instrument: Results from...

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Conference on Space Telescopes and Instrumentation - Ultraviolet to Gamma Ray

作者： Saleh-Natura, Julia Behara, Ehud Reicha, Omer Tarema, Shlomit Tarema, Zvika Vdovina, Alex Feigenboima, Amir Rahinb, Roi Kaidar, Avner Agalarian, Hovhannes Osovizky, Alon Ghelman, Max Technion Israel Inst Technol Dept Phys Haifa Israel NASA Goddard Space Flight Ctr Greenbelt MD USA Technion Asher Space Res Inst Haifa Israel Nucl Res Ctr Negev Israel

ISBN: (纸本)9781510675094;9781510675100

We present a full-size engineering model of GALI - The GAmma-ray burst Localizing Instrument, composed of 362 CsI(Tl) small cubic scintillators, distributed within a small volume of similar to 2l, and read out by silicon photomultipliers. GALI can provide directional information about GRBs with high angular accuracy from angle-dependent mutual obstruction between its scintillators. Here, we demonstrate GALI's laboratory experiments with an Am-241 source, which achieved directional reconstruction of <3 degrees accuracy, in agreement with our Monte-Carlo simulations. GALI has a wide field view of the unobstructed sky. With its current cubic configuration, GALI's effective area varies between 97 cm(2) (face on) and 138 cm(2) (from the corners at 45 degrees), which is verified in the current experiment.

关键词： gamma-ray bursts scintillators localization algorithms Cubeats Silicon photomultipliers coded mask aperture TOFPET ASICs detector simulations

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Wireless sensor localization based on distance optimization and assistance by mobile anchor nodes: a novel algorithm

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PEERJ COMPUTER SCIENCE 2024年 10卷 e2179页

作者： Yang, Hui Lanzhou Univ Arts & Sci Sch Media Engn Lanzhou Gansu Peoples R China

Wireless sensor networks (WSNs) have wide applications in healthcare, environmental monitoring, and target tracking, relying on sensor nodes that are joined cooperatively. The research investigates localization algorithms for both target and node in WSNs to enhance accuracy. An innovative localization algorithm characterized as an asynchronous time-of-arrival (TOA) target is proposed by implementing a differential evolution algorithm. Unlike available approaches, the proposed algorithm employs the least squares criterion to represent signal-sending time as a function of the target position. The target node's coordinates are estimated by utilizing a differential evolution algorithm with reverse learning and adaptive redirection. A hybrid received signal strength (RSS)-TOA target localization algorithm is introduced, addressing the challenge of unknown transmission parameters. This algorithm simultaneously estimates transmitted power, path loss index, and target position by employing the RSS and TOA measurements. These proposed algorithms improve the accuracy and efficiency of wireless sensor localization, boosting performance in various WSN applications.

关键词： Wireless sensor networks localization algorithms Target tracking Differential evolution algorithm Positioning accuracy

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Modelling of Underwater Acoustic Networks for Source localization in Arbitrary Bounded Reservoirs

Modelling of Underwater Acoustic Networks for Source Localiz...

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Joint Conference of the European-Frequency-and-Time-Forum / IEEE International Frequency Control Symposium (EFTF/IFCS)

作者： Narang, Sanjoli Harakare, Aditya Barhate, Nayan Varghese, Andrews Shrivastava, Aayush Gupta, Ayushi Indian Inst Technol AUV IITB Mumbai Maharashtra India

ISBN: (纸本)9781665439350

In this paper, a non-statistical MATLAB-based software model for a bounded shallow underwater acoustic network comprising an arbitrary number of transmitters, receivers and the water channel is presented. The model is constructed to highlight the non-ideal behavior of the underwater channel including attenuation, reflections, multipath effects, noise and phase-frequency shifts. To highlight the utility of the model, a Time-Difference-Of-Arrival (TDOA) algorithm to locate an underwater sound source using a hydrophone array is tested on the model and the received signals are observed to show realistic results as if they have actually propagated through the water channel. Such a network model can be used to test localization algorithms for any acoustic source, without the need to gather real data in the specific water reservoir.

关键词： Underwater channel modelling TDOA localization algorithms Multipath

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