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Dissertations / Theses on the topic 'TDOA'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Bennett, Granger Hart. "Acoustic transient TDOA estimation and discrimination." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384321.

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Thesis (M.S. in Electrical Engineering and M.S. in Engineering Acoustics) Naval Postgraduate School, September 2000.<br>Thesis advisor(s): Therrien, Charles W. ; Tummala, Murrali ; Smith, Kevin B. "September 2000." Includes bibliographical references (p. 57-58). Also available online.
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Arbring, Joel, and Patrik Hedström. "On Data Compression for TDOA Localization." Thesis, Linköping University, Information Coding, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57274.

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<p>This master thesis investigates different approaches to data compression on common types of signals in the context of localization by estimating time difference of arrival (TDOA). The thesis includes evaluation of the compression schemes using recorded data, collected as part of the thesis work. This evaluation shows that compression is possible while preserving localization accuracy.</p><p>The recorded data is backed up with more extensive simulations using a free space propagation model without attenuation. The signals investigated are flat spectrum signals, signals using phase-shift keyi
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3

Humpherys, Brian. "SIGNAL TDOA BASED HIGH RESOLUTION TSPI." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608843.

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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California<br>This paper describes a method for determining high resolution time, space, and position information for a test range flight vehicle using four tracking receivers. Equipped with GPS time systems, each receiver records the exact time at which a time marker embedded in the transmitted TM data stream is received. With this information, the time difference of arrival for the time markers at three of the receivers can be calculated referenced to the four
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4

Nan, Xie, and Zhang Futang. "Performance Analysis of Reentry TDOA Positioning System." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606140.

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ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>In reentry measurement, we need to measure the track of reentry vehicle. For the speed of target is very high, it is difficult for traditional positioning system to capture and track the target. TDOA (time difference of arrival) positioning system is used in reentry measurement. The position of target is calculated by using time difference of arrival. This paper introduces the principle of ree
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5

Kovavisaruch, La-or. "Source localization using TDOA with erroneous receiver positions." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/6278.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2005.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (May 22, 2006) Vita. Includes bibliographical references.
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6

Bressner, Thomas Arthur Herbert. "Development and Evaluation of UTDoAas a Positioning Method in LTE." Thesis, KTH, Signalbehandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176499.

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Although positioning has been one of the main target study areas in mobile communication in the last decade, it still receives strong attention in recent years focusing more on the indoor users. Nowadays, a wide range of different methods are available to estimate the position of the target user under certain circumstances. One of these methods is Uplink Time Difference of Arrival (UTDoA), which has been defined in 3GPP Release 11 for Long Term Evolution (LTE) networks, and is the focus of this master thesis. In Uplink based positioning, to estimate the position of a User Equipment (UE), the U
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7

Basciftci, Cagri Halis. "Direction Finding With Tdoa In A Multipath Land Environment." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608756/index.pdf.

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In this thesis, the problem of Angle of Arrival estimation of radar signals with Time Difference of Arrival method in an outdoor land multipath environment with limited line of sight is analyzed. A system model is proposed. Effects of system, channel and radar parameters on the Angle of Arrival estimation performance are investigated through Monte Carlo simulations. Improving effect of utilization of diversity on the estimation performance is observed. Performances of the space diversity with noncoherent and selective combining are compared. Finally a realistic scenario is studied and perfo
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8

Li, Binghao Surveying &amp Spatial Information Systems Faculty of Engineering UNSW. "Terrestial mobile user positioning using TDOA and fingerprinting techniques." Awarded by:University of New South Wales. School of Surveying and Spatial Information Systems, 2006. http://handle.unsw.edu.au/1959.4/25507.

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Specialists are expecting the knowledge of location will trigger yet another revolution in mobile services. Location-base services (LBS) have attracted many researchers and enterprises and one of the key aspects of LBS is positioning technology. Considering a wider and more complex field - ubiquitous computing, location is the fundamental element. This work focuses on some aspects of the new techniques of terrestrial positioning systems. Wireless LAN is one of the most popular systems used for positioning for indoor environments and public places. We have investigated the trilateration and fi
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KATAYAMA, Masaaki, Takaya YAMAZATO, and Jan Mateusz KIETLINSKI-ZALESKI. "TDoA UWB Positioning with Three Receivers Using Known Indoor Features." IEEE, 2010. http://hdl.handle.net/2237/14480.

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10

Aktas, Unal. "Time difference of arrival (TDOA) estimation using wavelet based denoising." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA360774.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, March 1999.<br>"March 1999" Thesis advisor(s): David V. Lamm, Michael W. Boudreau. Includes bibliographical references (p. 103-104). Also available online.
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11

Gartenburg, Michael A. "Scale and TDOA estimation using signal heterodyning and wavelet scaling." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/MQ44842.pdf.

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12

Aatique, Muhammad. "Evaluation of TDOA Techniques for Position Location in CDMA Systems." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/9558.

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The Federal Communications Commission (FCC) has adopted regulations requiring wireless communication service providers to provide position location (PL) information for a user requesting E-911 service. The Time Difference of Arrival (TDOA) technique is one of the most promising position location techniques for cellular-type wireless communication systems. The IS-95 Code Division Multiple Access (CDMA) system is a popular choice for the companies deploying new cellular and PCS systems in North America. Hence, the feasibility of TDOA techniques in CDMA systems is an important issue for position
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Hult, Alfred. "Time Synchronization of TDOA Sensors Using a Local Reference Signal." Thesis, Linköpings universitet, Kommunikationssystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166744.

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Synchronization of distributed time difference of arrival (TDOA) sensor networks can be performed using reference signals from GPS satellites. This method provides high accuracy, but is vulnerable to jamming, and is not reliable enough to be used in military applications. A solution that does not depend on any signals transmitted from external actors is preferred. One way to achieve this is to use reference signals transmitted from a UAV. A UAV is suitable since only local synchronization for a geographically restricted area is necessary. The local synchronization is achieved by estimating the
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KATAYAMA, Masaaki, Takaya YAMAZATO, and Jan Mateusz KIETLINSKI-ZALESKI. "Experimental Validation of TOA UWB Positioning with Two Receivers Using Known Indoor Features." IEEE, 2010. http://hdl.handle.net/2237/14479.

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15

Rosenberg, Pontus, and Angelica Henriksson. "Elektronisk träffmarkör." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25321.

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Företaget Jakt &amp; Skyttesystem AB har ett portabelt viltmålsskyttesystem som de vill utrusta med elektronisk träffmarkering som klarar av vapen av olika kaliber. Målet för projektet är att utvärdera och utveckla metoder för träfflokalisering i tavelskytte. Vi valde att utreda sensorsystem som inte begränsas av vapen med låg anslagsenergi. Därför har vi valt att endast utreda teknikerna ljudlokalisering i luft och fasta material samt bildlokalisering. Som utgångspunkt för projektet studerades hur befintliga skyttesystem fungerar, vilken sensorteknik och vilka material som används. Ett flerta
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16

Reza, Rahman Iftekhar. "Data Fusion For Improved TOA/TDOA Position Determination in Wireless Systems." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34723.

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The Federal Communications Commission (FCC) that regulates all wireless communication service providers has issued modified regulations that all service providers must select a method for providing position location (PL) information of a user, requesting for E-911 service, by October 2000. The wireless 911 rules adopted by the FCC are aimed both for improving the reliability of the wireless 911 services and for providing the enhanced features generally available for wireline calls. From the service providers' perspective, effective position location technologies must be utilized to meet the FC
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Nordzell, Andreas. "Double Differential TOA Positioning for GSM." Thesis, Linköpings universitet, Kommunikationssystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-94162.

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For most time-based positioning techniques, synchronization between the objectsin the system is of great importance. GPS (global positioning system) signalshave been found very useful in this area. However, there are some shortcomingsof these satellite signals, making the system vulnerable. The aim of this masterthesis is to investigate an alternative method for synchronization, independent ofGPS signals, which could be used as a complement. The proposed method takesadvantage of the broadcast signals from telecommunication towers, and use themfor calculation of the synchronization error betwee
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18

Meuleners, Michael. "Design and Implementation of a Distributed Tdoa-Based Geolocation System Using Ossie and Low-Cost Usrp Boards." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32731.

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The Software Communications Architecture (SCA) specification defines a framework that allows modular software components to be developed and assembled to build larger radio applications. The specification allows for these components to be distributed among a set of computing hardware and to be connected by standard interfaces. This research aims to build a spatially distributed SCA application for the Open Source SCA Implementation: Embedded (OSSIE) implementation using low-cost Universal Software Radio Peripheral (USRP) hardware. The system collects signals from multiple spatially distribu
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Kanduri, Srinivasa Rangarajan Mukhesh, and Vinay Kumar Reddy Medapati. "Evaluation of TDOA based Football Player’s Position Tracking Algorithm using Kalman Filter." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-16433.

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Time Difference Of Arrival (TDOA) based position tracking technique is one of the pinnacles of sports tracking technology. Using radio frequency com-munication, advanced filtering techniques and various computation methods, the position of a moving player in a virtually created sports arena can be iden-tified using MATLAB. It can also be related to player’s movement in real-time. For football in particular, this acts as a powerful tool for coaches to enhanceteam performance. Football clubs can use the player tracking data to boosttheir own team strengths and gain insight into their competing t
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Venkatraman, Saipradeep. "Wireless Location in Non-Line-of-Sight Environments." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085685908.

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21

Tas, Volkan. "Optimal Use of TDOA Geo-Location Techniques Within the Mountainous Terrain of Turkey." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17467.

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Emitter location finding enables important functionality for both military and civilian applications. GPS is the most recognized and widely used positioning system, but it is a receiver location system that functions in a markedly different manner from emitter location. Many geo-location techniques predate and have been proposed as an alternative to GPS. Some of the more commonly used and exploited of these techniques are angle of arrival, time of arrival, frequency difference of arrival, and time difference of arrival (TDOA). This thesis is primarily focused on TDOA. These techniques are impo
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Karlsson, Alexander. "Feasibility Study for Single Platform Airborne FDOA and TDOA Estimation With Unknown Source." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192443.

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Direction of arrival (DOA) estimation is a well studied topic and used in many different applications. Although it is usually based on time-difference-of-arrival (TDOA) of coherent signals, it is sometimes possible to also use frequency-difference-of-arrival (FDOA). By combining TDOA and FDOA a more reliable estimate of the DOA can be obtained. This can be useful in military applications such as reconnaissance and surveillance where the objective is to locate unknown transmitters. It is however not always possible to obtain accurate TDOA and FDOA estimates. In this study the conditions for thi
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23

BOTTIGLIERO, STEFANO. "A Real Time Locating System based on TDOA estimation of UWB pulse sequences." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2966337.

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24

Hedström, Joakim. "Positionsbestämning av radiosändare med kägelsnittsmetoden." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8255.

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<p>Vid Positionsbestämning av radiosändare med TDOA(Time Difference Of Arrival) är det traditionella sättet att låta varje uppmätt tidsskillnad definiera en hyperbelgren på vilken sändaren befinner sig. Skärningspunkten mellan två eller fler hyperbelgrenar ger sändarens position.</p><p>Målet med examensarbetet är att identifiera möjliga sändarpositioner och detektera mångtydigheter. Problemet har lösts med kägelsnittsmetoden som låter tre mottagares positioner och deras uppmätta tidsskillnader definiera ett kägelsnitt där sändarens position är i en av dess fokuspunkter.</p>
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25

Garcia, Hallo Ivan Vladimir. "Instrumentation d'essais en vol pour la localisation de décharges électrostatiques sur la surface d'un avion." Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0007/document.

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Le chargement électrostatique d’un avion en vol peut mener à des perturbations électromagnétiques sur les systèmes de communication et navigation à bord. Ce phénomène est appelé Precipitation Static (P-Static). Cette thèse vise à développer un outil capable de localiser la source des perturbations pour ainsi réduire le coût et la durée des missions d’investigation spécifiques en compagnie aérienne. Les principaux objectifs sont : •Comprendre les mécanismes de charge et décharge électrique d’un avion en vol. •Développer une instrumentation capable de mesurer les émissions des sources de P-Stati
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Abudabbousa, Ahmed. "OFDM based Time Difference Of Arrival Estimation." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS112/document.

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Cette thèse présente une solution originale permettant d’extraire, à partir de signaux de communication OFDM, l’information liée à la différence de temps d’arrivée (TDOA) entre deux émetteurs très proches et un récepteur. Cette méthode, qui s’avère super-résolutive, permet d’extraire des TDOA en dessous de la limite de Rayleigh fixée par la bande passante utile. Dans ce travail, nous effectuons, à l'aide d'une sortie simple à entrées multiples, la caractérisation et la modélisation des canaux pour l’estimation TDOA. En gérant ces réponses ce canal de fréquence de canal de différentes manières,
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Mantis, Spiros D. "Localization of wireless communication emitters using Time Difference of Arrival (TDOA) methods in noisy channels." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA392075.

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Thesis (M.S. in Electrical Engineering and M.S. in Systems Engineering) Naval Postgraduate School, June 2001.<br>Thesis advisor(s): Hippenstiel, Ralph D. ; Jenn, David C. ; Ha, Tri T. "June 2001." Includes bibliographical references. Also available online.
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Tian, Jie, Dong Hou, Nan Xie, and Yongsheng Cheng. "METER-LEVEL TDOA MULTILATERATION SYSTEM BASED ON HIGH PRECISION PHASE SYNCHRONIZATION OVER FIBER OPTICAL LINKS." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/626954.

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The accuracy of TDOA estimation between sites affects the final positioning calculating the performance of the target. The problem needs to be solved in the multi-station localization systems, requires highly accurate phase synchronization for consistency errors cancellation of receivers. In this paper, the impact of phase error on TDOA localization is analyzed briefly, and we proposed a TDOA multi-station positioning system based on a phase synchronization technique via a long round-trip FOL. By comparing with an actual GPS timing TDOA based method, we demonstrated that the performance of the
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Belanger, Scott Patrick. "Maximum likelihood TDOA/DD estimation in a multipath propagation environment using the expectation-maximization algorithm." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/15371.

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30

Zandian, Reza [Verfasser]. "Ultra-wideband Based Indoor Localization of Mobile Nodes in ToA and TDoA Configurations / Reza Zandian." Bielefeld : Universitätsbibliothek Bielefeld, 2019. http://d-nb.info/119663985X/34.

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31

Haney, Timothy N. "Generation of Global System for Mobile (GSM) signals and their Time Difference of Arrival (TDOA) estimation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA381073.

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Thesis (M.S. in Electircal Engineering) Naval Postgraduate School, June 2000.<br>"June 2000." Thesis advisor(s): Hippenstiel, Ralph ; Ha, Tri T. Includes bibliographical references (p. 77-78). Also available online.
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Siripi, Vishnu Vardhan. "Investigation of an optimal utilization of Ultra-wide band measurements for position purposes." Thesis, Karlstad University, Division for Information Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-122.

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<p>Ultra wideband (UWB) communication systems refers to systems whose bandwidth is many times greater than the “narrowband” systems (refers to a signal which occupies only small amount of space on the radio spectrum). UWB can be used for indoor, communications for high data rates, or very low data rates for substantial link distances because of the extremely large bandwidth, immune to multi-path fading, penetrations through concrete block or obstacles. UWB can also used for short distance ranging whose applications include asset location in a warehouse, position location for wireless sensor ne
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Vícha, Tomáš. "Lokalizace objektů v prostředí bezdrátové senzorové sítě." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445530.

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This thesis deals with the use of spatial awareness methods within technologies designed for creation of short-range wireless sensor networks. The thesis analyzes several techniques that can be used to estimate position of objects within the sensor network. For a practical solution, a method based on measuring the time differences of the sent messages was chosen. A circuit implementation of a network node based on the DW1000 chip, which works on ultra-wideband transmission technology, was implemented. A sensor network with the appropriate user application for its operation and display of local
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Wikström, Maria. "Utveckling och implementering av ett audiopejlsystem baserat på tidsdifferensmätning." Thesis, Linköping University, Department of Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1468.

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<p>The use of spread spectrum signals has increased dramatically in military applications. Finding methods for detecting and positioning of these signals have become interesting research areas for signal intelligence purposes. One method is to measure the time difference of arrival (TDOA) that occurs when two receivers are synchronous and spatially separated. Based on the TDOA-technique an audio-demonstrator has been developed and implemented. This report describes the theory for how sound received in microphones can be used to extract information about the transmitter’s position from the meas
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Kumarasiri, Nuwan Rajika. "Development of Novel Algorithms for Localization in Wireless Sensor Networks." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1415717194.

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Eiselt, Jonas, and Danial Mahmoud. "Indoor positioning system using ultrasound combined with multilateration." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20729.

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Under det senaste decenniet har inomhuspositionering fått en ökad popularitet och stått i fokus för forskning och utveckling, eftersom det ger praktiska möjligheter till att spåra och navigera objekt och människor i inomhusmiljöer. Det finns ingen global lösning för inomhuspositionering baserat på en enstaka teknologi såsom det gör för utomhuspositionering med sin satellitbaserade globala positioneringssystem. Många inomhusteknologier står inför många utmaningar såsom låg positioneringsnoggrannhet samt dyr och stor hårdvara. Den här uppsatsen beskriver hur en simpel och kostnadseffektiv lösnin
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Kilari, Anusha. "Indoor Location for Emergency Responders Using Asynchronous Differential TDOA in LTE D2D Communications Waveform: Principle and Implementation Using USRP." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1583853925926655.

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Giacometti, Romain. "Détection et localisation des signaux radar (systèmes passifs ou discrets)." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0083.

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L’objectif de cette thèse est de développer de nouvelles solutions pour détecter et localiser des sources électromagnétiques radar au niveau d'une unique station de réception en exploitant les signaux directs et indirects reçus. Dans le cadre de notre étude, nous avons dans un premier temps développé une modélisation du signal reçu au niveau d'un récepteur en tenant compte des caractéristiques des émetteurs et de la zone environnante. L'évaluation de cette modélisation a été effectuée en s'appuyant sur un cas particulier de détection et de localisation des réflecteurs. Ce dernier, traité dans
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Yan, Chunpeng. "Asynchronous Localization for Wireless Sensor Networks." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1236008270.

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Yang, Le. "On the Use of Multiple Emitters to Improve the TDOA Source Localization Accuracy in the Presence of Random Sensor Position Errors." Thesis, University of Missouri - Columbia, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13877178.

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<p> Source localization using TDOA measurements has been an important research topic mainly because of its wide applications in practical localization systems. The TDOA localization accuracy is known to be very sensitive to the sensor position errors and even a small amount of sensor position errors can cause significant performance loss. This thesis considers the use of calibration emitters to improve the source location estimate from TDOAs when the sensor positions are subject to random errors. The principle behind is that with calibration emitters, extra TDOA measurements that contain infor
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Olofsson, Ivar. "Enhancements in LTE OTDOA Positioning for Multipath Environments." Thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131821.

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By using existing radio network infrastructure, a user can be positioned even where GPS and other positioning technologies lack coverage. The LTE Positioning Protocol (LPP) supports user Reference Signal Time Difference (RSTD) reports based on the Time of Arrival (TOA) for a Positioning Reference Signal (PRS). In the current reporting format, only one RSTD for each base station is considered, but for indoor environments this is easily biased due to fading and multipath issues, resulting in a Non-Line of Sight (NLOS) bias. With a rich User Equipment (UE) feedback that can represent the multipat
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Fall, Bouna. "Evaluation des performances d'un système de localisation de véhicules de transports guidés fondé sur l'association d'une technique radio ULB et d'une technique de retournement temporel." Thesis, Valenciennes, 2013. http://www.theses.fr/2013VALE0028/document.

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En transports guidés, la localisation précise des trains s’avère vitale pour une exploitation nominale du système de transport. Dans un environnement de propagation tel que celui d’une emprise ferroviaire, un capteur de localisation efficace est complexe à concevoir et à valider lorsqu’il doit opérer en présence de nombreux obstacles fixes et mobiles constitués par l’infrastructure et les trains. Afin de concevoir un tel capteur, nous proposons dans ce travail de thèse l’emploi de techniques innovantes dites de diversité spectrale que l’on retrouve également sous la dénomination de radio Ultra
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Calafiore, Nicolò. "Localizzazione di sorgenti RF tramite cross correlazione." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15661/.

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Nell’era tecnologica in cui ci troviamo è facile rendersi conto che la nostra posizione è costantemente tracciata e “online” visto che ogni dispositivo elettronico che utilizziamo determina continue localizzazioni in tempo reale. In tutti gli smartphone e computer infatti, è presente un GIS (Geographic Information System) capace di individuarci. Lo stesso Google, per esempio, ad ogni ricerca ci chiede di poter localizzare la nostra posizione per poter ottimizzare le ricerche in base a ciò che si trova nelle vicinanze. Ecco perché gli studi per migliorare l’affidabilità e l’accuratezza delle ap
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44

Gising, Andreas. "MALLS - Mobile Automatic Launch and Landing Station for VTOL UAVs." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-15980.

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<p>The market for vertical takeoff and landing unmanned aerial vehicles, VTOL UAVs, is growing rapidly. To reciprocate the demand of VTOL UAVs in offshore applications, CybAero has developed a novel concept for landing on moving objects called MALLS, Mobile Automatic Launch and Landing Station. MALLS can tilt its helipad and is supposed to align to either the horizontal plane with an operator adjusted offset or to the helicopter skids. Doing so, eliminates the gyroscopic forces otherwise induced in the rotordisc as the helicopter is forced to change attitude when the skids align to the ground
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45

Oglesbee, Robert A. "SPATIAL LOCATION OF ELECTROSTATIC DISCHARGE EVENTS WITHIN INFORMATION TECHNOLOGY EQUIPMENT." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/490.

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In this thesis, a system to locate an electrostatic discharge (ESD) event within an electronic device has been developed. ESD can cause a device to fail legally required radiated emissions limits as well as disrupt intended operation. The system used a fast oscilloscope with four channels, each channel attached to a high frequency near-field antenna. These antennas were placed at known locations in three dimensional space to measure the fields radiated from the ESD event. A Time-Difference-of-Arrival technique was used to calculate the location of the ESD event. Quick determination of the ESD
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46

Sven, Ahlberg. "Evaluation of Different Radio-Based Indoor Positioning Methods." Thesis, Linköpings universitet, Kommunikationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-107702.

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47

Breen, Jr Daniel E. "Characterization of Multi-Carrier Locator Performance." Digital WPI, 2004. https://digitalcommons.wpi.edu/etd-theses/563.

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Time-Difference-of-Arrival (TDOA) location estimation is central to an OFDM based Precision Personnel Locator system being developed at WPI. Here we describe a component of the effort towards characterizing the performance of such a system and verifying the functionality of hardware and software implementations. The performance degradations due to noise in the received signal and misalignments between transmitter and receiver clock and heterodyne frequencies are investigated. This investigation involves development of a MATLAB simulator for the entire system, experimental measures using a prot
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48

Overfield, Jacob Ivan. "Impact of MIMO Transmission on CAF-Based Geolocation." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51857.

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The Cross Ambiguity Function (CAF) is often used for passive geolocation of an emitter based on the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) of the received signals. CAF performance has been thoroughly investigated in regards to traditional single-input single-output (SISO) signals. Little is known about how the CAF will respond to signals from multiple-input multiple-output (MIMO) systems which utilize multiple antennas. This thesis focuses on characterizing the CAF's magnitude distribution in order to determine the probability of correctly determining the
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49

Pospíšil, Jan. "Lokalizace v rámci technologie LoRaWAN." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400889.

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The diploma thesis in theoretical part focuses on LPWAN in general, meaning the low power wireless device falling into IoT category with a focus on LoRaWAN. The second half of the theoretical part focuses on describing localization techniques and principles in general and selection of one suitable technique for implementation in LoRaWAN. The practical part focuses on the proper HW customizations to enable the localization in this network. There are also described all the steps needed to build the whole working LoRaWAN network. The TDoA localization algorithm is described, the functionality is
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50

Vincent, David E. "PORTABLE INDOOR MULTI-USER POSITION TRACKING SYSTEM FOR IMMERSIVE VIRTUAL ENVIRONMENTS USING SENSOR FUSION WITH MULTIDIMENSIONAL SCALING." Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1335634621.

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