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Identifier |
000414779 |
Title |
METAL - Multiple Emitters Tracking And Localization system |
Alternative Title |
METAL - Σύστημα παρακολούθησης και εντοπισμού πολλαπλών πομπών |
Author
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Βαρδάκης, Γεώργιος Μ.
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Thesis advisor
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Δημητρόπουλος, Ξενοφώντας
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Reviewer
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Τραγανίτης, Απόστολος
Μουχτάρης, Αθανάσιος
Παπαδάκης, Στέφανος
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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.
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Language |
English |
Subject |
Localization |
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MIMO |
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Tracking emitter |
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Εντοπισμός θέσης |
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Πομπός |
Issue date |
2018-03-23 |
Collection
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School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/c/e/9/metadata-dlib-1520501061-382816-28304.tkl
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Views |
477 |