30 September Indoor Positioning and Indoor Navigation Using Wi-Fi 2 MIN READ September 30, 2019 By Gina Wurms general posts |WiFi|, |positioning technology|, |indoor navigation| 0 Positioning using GPS does not work reliably inside buildings as there is no visual contact with the GPS satellites. A good alternative is indoor positioning using Wi-Fi. An additional advantage compared to GPS is the possibility to determine the current floor level. Setting up an Indoor Positioning System using Wi-Fi In most cases it is easy to install a Wi-Fi positioning system, since Wi-Fi access points already exist in many buildings. For example, existing customer hotspots, cash register systems and routers from shops can be used. The calibration of position determination works with a one-time reference measurement in the run-up, where the signal strength of the Wi-Fi networks is determined. If a server-based solution is more suitable for the project, infsoft Locator Nodes can be installed throughout the building. In order to detect smartphones and other mobile devices, their Wi-Fi function has to be switched on, a connection to the network is not necessary, but has a positive influence on latency times and allows the unambiguous correlation of devices. Technology For positioning, the so-called fingerprinting method is used. The strength of the Wi-Fi signals (received signal strength indication, RSSI) and the MAC address (media access control) are significant. For a client-based solution, the position is determined directly on a mobile device. A smartphone app calculates the current position based on the signal strength and MAC address. Optionally, the position data can be sent to a server for further processing. When a server-based solution is applied, no app is required, all Wi-Fi capable devices are detected by the infsoft Locator Nodes and Wi-Fi tracking is possible. Accuracy of Wi-Fi for Indoor Positioning Accuracy depends on multiple factors, for example the number of available networks, reflections for example in corridors and last but not least shielding through walls, ceilings and your own body. The accuracy of Wi-Fi used for indoor positioning varies from five to 15 meters – depending on the preconditions. Sensor fusion – the use of smartphone sensors – can further improve accuracy. Indoor Navigation Indoor navigation is a popular application of positioning using Wi-Fi. An indoor navigation solution makes sense wherever complex structures are to be found. Especially in airports, railway stations, shopping centres, hospitals, museums, offices and industrial complexes, an indoor navigation app can significantly improve the experience for visitors and employees. In order to realize an indoor navigation, a client-based solution is required. Analysis of positioning data The position data can also be used for analysis purposes. Either the data calculated on the smartphone can be sent to the backend, or a server-based solution can be used. The collected data provides important insights, for example into visitor behavior, and can uncover optimization potential for processes. In addition to people who are carrying Wi-Fi enabled devices, assets such as medical devices in hospitals or laptops in office buildings can be tracked by attaching Wi-Fi tags. Thereby, they can always be found easily and are furthermore protected against theft. Pros and Cons of Indoor Positioning using Wi-Fi Pros existing Wi-Fi infrastructure can be used enabled Wi-Fi is sufficient large range (up to 150m) detects floor level Cons relatively inaccurate (5-15m) no constant latency times use of randomized MAC address when smartphone is not connected to Wi-Fi network Wi-Fi client-based positioning is not possible with iOS devices Find out more about application scenarios by reading some interesting use cases for position determination with Wi-Fi. More information on this topic can be found here. Get the white paper for free Great introduction to the topic of indoor positioning Download Related Articles Indoor Navigation & Indoor Positioning Using Bluetooth Indoor navigation & indoor positioning using Bluetooth – learn more about the pros & cons. Read More "Indoor GPS" - Techniques for Indoor Positioning Without Using GPS Techniques for indoor positioning without using GPS - learn more about Indoor GPS in our blog. Read More Indoor Navigation, Indoor Positioning and Location-Based Services Using VLC (Visible Light Communication) Indoor navigation, indoor positioning and location-based services using VLC (visible light communication). Read More Techniques for Client-Based Indoor Positioning – GPS, Wi-Fi, Bluetooth and VLC Compared Techniques for client-based indoor positioning – GPS, Wi-Fi, Bluetooth and VLC compared - check out our infographic. Read More Indoor Positioning and Indoor Navigation: 7 Use Cases Indoor positioning and indoor navigation: We show you 7 use cases from aviation, public transport, healthcare, tourism, industry, trade fair and retail. Read More Technologies for Server-Based Indoor Positioning Compared: Wi-Fi vs. BLE vs. UWB vs. RFID This blog post compares the most common technologies for indoor positioning. Read More Comments are closed.