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Identifier 000414779
Title METAL - Multiple Emitters Tracking And Localization system
Alternative Title METAL - Σύστημα παρακολούθησης και εντοπισμού πολλαπλών πομπών
Author Βαρδάκης, Γεώργιος Μ.
Thesis advisor Δημητρόπουλος, Ξενοφώντας
Reviewer Τραγανίτης, Απόστολος
Μουχτάρης, Αθανάσιος
Παπαδάκης, Στέφανος
Abstract The concept of localization refers to the estimation of a target’s position. Applications can range from geolocational services, to the tracking of patients’ whereabouts inside a hospital. The spreading of devices utilizing at least some form of radio frequency communication, has opened the door to even more flexible and robust localization systems. This is due to the fact that their signals, traversing the air, can be used to infer the transmitter’s position. In this work we present Multiple Emitters Tracking And Localization (METAL), a localization system for estimating users’ positions in indoor environments which can potentially be used alongside existing infrastracture for telecommunication protocols like IEEE 802.11. METAL utilizes mechanisms and technologies employed widely, in order to perform target position estimation efficiently, such as Multiple Input Multiple Output (MIMO). Systems employing this technique utilize multiple antennas for transmission and reception instead of one, with the purpose to increase the capacity of the communication channel or to improve reception. METAL expolits the MIMO technology in order to infer the position of a transmitter using an antenna array with multiple elements. For proof of concept we employ our system utilizing Software Defined Radios (SDRs). By the term SDR we refer to systems on which components which were traditionally implemented in hardware,— such as filters, modulators/demodulators— are instead implemented in software. The flexibility of such systems is enormous since they can easily adapt to almost any communication protocol and any radio frequency. This trait has brought great popularity to the SDR domain over the past years and has enabled systems like METAL to be much easier implemented and tested. In our work we explore the benefits and drawbacks of combining SDR and MIMO technologies for localization purposes. In our quest for creating an antenna array using multiple SDR devices, we succesfully combat the essential problem of time-synchronizing the receiving streams of the SDR devices of our system. This is done by employing an over-the-air, low-cost technique using the long training sequence of the IEEE 802.11 protocol, which is capable of synchronizing a large number devices at the same time. Furthermore we examine the type of array that presents the best performance in localization scenarios by comparing some of the most widely used array geometries. Finally, our localization algorithm ,along with the mechanisms for dealing with multiple reflected signals, is presented. We demonstrate that our system is superior to similar ones, based on the fact that it can be used with a large number of telecommunication protocols, without being restricted to a single one.
Language English
Subject Localization
MIMO
Tracking emitter
Εντοπισμός θέσης
Πομπός
Issue date 2018-03-23
Collection   School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/c/e/9/metadata-dlib-1520501061-382816-28304.tkl Bookmark and Share
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