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.
Implementation techniques
6.1 Choke point concepts
6.2 Grid concepts
6.3 Long range sensor concepts
6.4 Angle of arrival
6.5 Time of arrival
6.6 Received signal strength indication
6.7 Inertial measurements
6.8 Others
