Relative Positioning
نویسنده
چکیده
Many ubiquitous computing applications rely upon location information describing the positions of people and devices. To date, location systems for ubiquitous computing have commonly supplied position data which has a single system-wide reference [1]. Examples include 3D coordinates inside a building, or public areas on a campus. In order to provide statically-referenced data, such systems necessarily utilise marking or sensing units located at fixed positions in the environment. The units emit or sense signals via some physical medium (such as infrared light, ultrasound, or wireless LAN radio waves). These types of system tend to have two drawbacks.
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