1. Sensor Localization for Location-Based Authentication Valliappan Annamalai And John Quintero

2. Project Goals Develop a localization mechanism for use in location-based authentication. Develop a localization mechanism for use in location-based authentication. Location-based access to computing resources. Location-based access to computing resources. Focus on determining location indoors. Focus on determining location indoors.

3. Challenges Indoor signal propagation subject to suffers from multipath propagation, shadowing and scattering. Indoor signal propagation subject to suffers from multipath propagation, shadowing and scattering. Use scene analysis by constructing a signal-strength map of the lab. Use scene analysis by constructing a signal-strength map of the lab. Antenna orientation and pedestrian traffic cause local variation in signal strength. Antenna orientation and pedestrian traffic cause local variation in signal strength.

4. Project Applications Badge Badge Base Station Base Station Serial Forwarder Serial Forwarder Tracker Sender Tracker Sender Tracker Server Tracker Server

5. Example Architecture Six base stations are used to capture signal strength information from a badge, which is compared to a pre-compiled mapping. Six base stations are used to capture signal strength information from a badge, which is compared to a pre-compiled mapping. B: badge broadcasts id to establish its location.B: badge broadcasts id to establish its location. BS: wireless base station captures badge signal strength, forwards to base station.BS: wireless base station captures badge signal strength, forwards to base station. BS B

6. Application Messaging BadgeBase Station Tracker Server Serial Forwarder Tracker Sender W/L Message With Bdg ID Bdg Msg With BS ID and Signal Strength Forwards the Messages it Receives UDP data packets with BS message W/L Message With Bdg ID 1 Sec One PC Second PC