Mestrado em Engenharia Eletrónica e TelecomunicaçõesSem resumo disponivel.The technological advances achieved on the last quarter century enabled
signi cant improvements in terms of locating people and property.
However, the inability of the present location systems to estimate highly
accurate positions, particularly in indoor environments, keeps restricting
their use, leading to the research performed in this document.
After reviewing the existing solutions, this thesis proposes the development
and implementation of Thesis Location System (TLS), an
indoor location system based on the recent technology Bluetooth Low
Energy. TLS consists on a wireless sensor network composed by a set
of SensorTag devices from Texas Instruments disposed in xed and
previously known positions, supported by an Android app, that acts as
the central module and receives their signals, and by a web page built
for con guration purposes which are connected by an external server.
The developed work also includes a method of processing the collected
data, as well as an analysis of the resulting e ects from the tags' signal
propagation through the environment. The analysis reveals some evident
limitations of the dimensioned system, but even so TLS performs
with an average accuracy of 2.5 meters (that can exceed ve meters
in the worst circumstances), with 77% of the estimates considered as
valid
