Approved
Hybrid Wireless Positioning
Phalguni Nagendra (2020) and Marco Vihelmo Velapatiño Gamarra (2020)
Start
2022-01-30
Presentation
2022-10-06 14:15
Location:
E:2349
Finished:
2022-11-04
Master's thesis:
Abstract
There is an increasing need by location-based applications and systems to obtain the position of a device with high precision. There are various technologies which help this purpose such as GNSS, 5G, Wi-Fi, Bluetooth, RFID, etc. GNSS technology is one of the most popular since its usage is free and it allows obtaining the position of an object worldwide, likewise GNSS can obtain centimeter-precision locations with the help of techniques such as Real time kinematic (RTK). GNSS performs better in outdoor environments since there is a direct line of sight between the satellite system (GPS, GLONASS, Galileo, etc.) and the device to be located. On the other hand, it is also necessary to obtain a high precision location when the devices are in indoor environments, Bluetooth Low Energy (BLE) is one of the most used technologies for location in this kind of scenario. BLE has the characteristic of low energy usage and is ideal for applications that transmit small amounts of data. Besides, its presence in many devices makes it ideal for use in location-based applications. With the direction finding technique included in the Bluetooth 5.1 version, which makes use of the angle of arrival (AoA) of the Bluetooth signal and a set of multi-antennas, it is possible to obtain the indoor location of a mobile device with meter-level accuracy. Although GNSS and Bluetooth are precise technologies giving positions for outdoor and indoor environments respectively, there is a loss of this precision when the device is in an outdoor-indoor environment (overlapped area). A Hybrid Position System could be a solution to overcome this problem, since it is a combination of two or more technologies to obtain better results in the accuracy of localization. GNSS and Bluetooth could work together as a hybrid system in order to obtain better location accuracy when the user is moving between outdoor-indoor environments. The main aim of this project is to improve location accuracy in indoor-outdoor environments (overlapped area) using a hybrid location system. Since the location accuracy in this transition environment decreases when using separate location technologies such as GNSS and Bluetooth.
Supervisor: Fredrik Tufvesson (EIT)
Examiner: Maria Kihl (EIT)