Integrity monitoring in wireless LAN positioning systems




Yerubandi, Sri Phani Kiran

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Indoor Positioning Systems using WLANs have become very popular in recent years. Most of us are familiar with Global Positioning System (GPS) products that help us navigate while driving, hiking, boating, and flying. GPS uses a combination of orbiting satellites to determine position coordinates. This works great in most outdoor areas, but the satellite signals are not strong enough to penetrate inside most indoor environments. As a result, a new strain of indoor positioning technologies that make use of 802.11 wireless LANs is beginning to appear on the market. These systems are spawning a new class of applications like activity recognition, surveillance, context aware computing and location based services. As the performance of GPS in indoor environments is not satisfactory, indoor positioning systems based on location fingerprinting of WLANs is being suggested as a viable alternative. The main advantage of this technique is that it can be deployed with minimal cost as no specialized hardware is necessary for setting up the system. Pre-existing WLAN infrastructure can be reused for this kind of positioning system. Several challenging problems still exist such as extensive training overheads.

In this thesis, WLAN based tracking methods are studied and developed. First a testbed is developed to incorporate various approaches for comparative analysis. Then a novel integrity monitoring approach is introduced and analyzed for real time indoor location system. As another component, an available Robot called HE-Robot is integrated in the system to serve as a reference to the testbed. A practical application for integrity monitoring application is developed as a case study.


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Electrical and Computer Engineering