Design and development of a Blutooth-based indoor positioning system

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Dr. Szabó Sándor
Department of Networked Systems and Services

Nowadays Location Based Services are becoming more and more essential in our lives. Though the global navigation satellite systems are available in outdoor situations, and because of this we are able to acquire our actual position using our mobile devices (such as smartphones) throughout the globe, when we are inside a building or under the Earth’s surface, these systems are unfortunately more or less useless.

In this paper I summarize the design and experimental development of a general Bluetooth based indoor localization system, that is applicable on large scale of mobile devices and is able to guarantee a suitable accuracy and responsivity. Though there are many different approaches of such systems in publications and commercial systems, none of them was spread widely. Taking this into consideration I started the analysis of the possible solutions from the fundamentals.

At the start of the designing process I enumerated the relevant positioning techniques, analysed the relevant layers of the Bluetooth technology, and discovered the supported features on the different mobile platforms. After this I was able to derive the possible system architectures, that could lead to a workable system. Taking into account the given criteria, I was able to choose a feasible solution that is relying on informations, that can be accessed through the discovery process of the Bluetooth technology.

After deep anlysis of the methods using received power, based on the measurements I made, in conclusion the RSSI values were not thrustworthy enough to be useful in a widespread system, and because of this I decided to make use of a simple cell-based approach with different filtering methods.

Verifying the system, I developed the Bluetooth beacons, and a mobile positioning subsystem, that could be used by any other location based application. After the verification measurement process, the results were positive enough to conclude that the system can be used easily, even without complex predesigning phases in real-world scenarios on wide range of mobile devices.


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