Indoor localization

OData support
Dr. Szabó Sándor
Department of Networked Systems and Services

In my thesis I’ve analyzed the birth of navigational systems from the early beginning, technologies after the use of the sextant. I’ve introduced aircraft’s radio navigation, the OMEGA system, which has used interfering signals to aid sailors. Afterwards I’ve examined the pros and cons of the TRANSIT satellite system, and the today well known NAVSTAR GPS.

First I’ve studied solutions that work inside buildings that rely on radio waves: such as mobile communication radio, WiFi or Bluetooth. Besides I’ve written a few words of using GPS technology on the ground or transferring the signals inside venues. Talking about alternative technologies I’ve looked up the use of RFID and NFC, inertial navigation or check-in that can be aided by NFC radio or by scanning visual 2D barcodes. I’ve examined the use of image processing in navigation that is actually artificial sight. Last, but not least I’ve written of a navigation based on analyzing sound waves.

In the chapter of practical use, I’ve thought about the use of all possible technology and decided to use the one that relies on cell and WiFi data, and implemented this as an Android application. Among this work, I’ve thoroughly tested and measured some components in the Google Maps app on Android and compared those to the same software, but ran on BlackBerry or iOS device. I’ve continued the development of the software, so tried to have a better, more precise result. As a matter of fact, I’ve coded to examine the microphone’s input and have it Fourier-transformed in order to get the frequency with the highest energy.

At the end I’ve concluded my thoughts, and listed all the good and bad things about the studied solutions. Furthermore I’ve submitted some ideas how to improve the currently used technologies or what solutions I might think of the future.


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