Indoor Positioning System
An indoor positioning system (IPS) is a network of devices used to wirelessly locate objects or people inside a building. Generally the products offered under this term do not comply with the International standard ISO/IEC 24730 on real-time locating systems (RTLS). There is currently no de facto standard for an IPS systems design, so deployment has been slow. Nevertheless, there are several commercial systems on the market.
Instead of using satellites, an IPS relies on nearby anchors (nodes with a known position), which either actively locate tags or provide environmental context for devices to sense. The localized nature of an IPS has resulted in design fragmentation, with systems making use of various optical, radio, or even acoustic technologies.
Systems design shall take into account, that unambiguous locating service requires at least three independent measures per target. For smoothing to compensate for stochastic errors there must be a mathematical over-determination that allows for reducing the error budget. Otherwise the system must include information from other systems to cope for physical ambiguity and to enable error compensation.
Read more about Indoor Positioning System: Applicability and Precision, Relation To GPS, Locating and Positioning, Locating and Tracking, Identification and Segregation, Wireless Technologies, Mathematics, Uses
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