Indoornavigation mit mobilen Endgeräten: Indoor Navigation with Mobile Devices
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Au erhalb geschlossener Räume sind Navigationsanwendungen auf mobilen Endgeräten zu alltäglichen Begleitern geworden, um möglichst schnell und auf kürzestem Weg zu einem gewünschten Zielort zu gelangen. Doch innerhalb von Gebäuden funktionieren diese Systeme bisher noch nicht in gewohnter Weise. In Einkaufscentern, Museen, Universitätsgebäuden oder an Flughäfen wird in der Regel auf Hinweisschilder und Gebäudepläne mit Standortmarkierung zurückgegriffen. Jedoch steigt das Bedürfnis gewohnte Navigationsapplikationen auf dem Smartphone oder Tablet auch in Innenbereichen nutzen zu können, weshalb das Interesse am Forschungsgebiet der Indoornavigation stetig zunimmt. Die Tango-Technologie ist eine innovative Lösung von Google, die Bewegungsverfolgung, Umgebungswiedererkennung und Tiefenwahrnehmung auf Smartphones und Tablets ermöglicht. Die relative Geräteposition kann kontinuierlich und ohne zusätzlich erforderliche, externe Hardwarestrukturen bestimmt werden. Diese Arbeit bietet eine geordnete Übersicht über den aktuellen technologischen Stand der Indoornavigation. Hierfür werden diverse Lokalisierungstechniken, Datenmodelle und Routingverfahren im Kontext der Navigation mit mobilen Endgeräten innerhalb von Gebäuden analysiert. Anschlie end folgt die Beschreibung der Entwicklung einer Kartierungsapplikation für Googles Project Tango, die zweidimensionale Gebäudepläne und einen Indoornavigations-graphen der Umgebung erzeugt. Diese Daten sollen die Grundlage für ein nachfolgendes Navigationssystem darstellen. Bei Vergleich der, von der Anwendung berechneten, Längenangaben mit Referenzmessungen eines Laser-Entfernungsmessgeräts liegt die Genauigkeit bei durchschnittlich 97 Prozent. Den grö ten Einfluss auf die Messungen haben dabei die bestehenden Lichtverhältnisse, transparente Objekte und Differenzen in der internen Positions-bestimmung des Tango-Gerätes.
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