Logo des Repositoriums

Auflistung nach Schlagwort "GNSS"

1 - 2 von 2
  • Konferenzbeitrag
    Einfluss der Samplingrate von Outdoor-Tracking-Systemen für Milchkühe auf abgeleitete Bewegungsparameter
    (42. GIL-Jahrestagung, Künstliche Intelligenz in der Agrar- und Ernährungswirtschaft, 2022) Engels, Christiane; Buescher, Wolfgang
    Um den Einsatz von Outdoor-Tracking-Systemen zur Gesundheitsüberwachung auf der Weide zu testen, wurde in dieser Studie der Einfluss der Samplingrate, also der Häufigkeit der Positionsbestimmung, auf die Ableitung von Bewegungsparametern untersucht. Dabei wurden die GPS-Positionsdaten von fünf trockenstehenden Milchkühen über 21 Tage mit einer Frequenz von 1 Hz erfasst und daraus die zurückgelegte Wegstrecke und die Raumnutzung für verschiedene Samplingraten berechnet und ausgewertet. Ein Intervall von 1 min stellte sich dabei als notwendig heraus, um Bewegungsparameter in ausreichender Präzision abzuleiten. Für eine praxistaugliche Akkulaufzeit muss daher mit den derzeit verfügbaren Trackingsystemen ein Kompromiss hinsichtlich des Genauigkeitsverlusts eingegangen werden.
  • Konferenzbeitrag
    High Accuracy GPS Antennas in Educational Location-based Augmented Reality
    (Proceedings of DELFI Workshops 2022, 2022) Osipova, Margarita; Das, Sanghamitra; Riyad, Peter; Söbke, Heinrich; Wolf, Mario; Wehking, Florian
    In location-based augmented reality (AR), the augmentations depend on the geolocation. Location-based AR might be used in higher education for enabling authentic learning experiences. However, the positioning accuracy achievable with GPS receivers built into off-the-shelf mobile devices has been shown in previous studies to be suboptimal for a subset of learning scenarios. Accordingly, in this comparative study, we investigated whether high accuracy GPS antennas are capable of achieving higher positioning accuracy, which also may improve the learning experience. Specifically, a mobile geographical information system (GIS) client (AugView) was used to visual-ize pipes and manholes in the underground. Participants were tasked with recording a local sewer system using the GIS client and subsequently visualizing the network using the GIS client’s AR mode. The experimental group (N=8) used an external GPS antenna, while the control group (N=8) relied on the standard GPS receivers of the mobile device. Usability was assessed using the Post-Study System Usability Questionnaire, learning outcomes were measured using pre- and post-test. In addition, semi-structured interviews were conducted with all participants. As a result, usability and learning outcomes were found to be better for the experimental group, but deficits in accuracy of the visualizations were also found with the GPS antenna. In particular, the time delay that must be waited until a high accuracy is achieved in case of non-uniform motion has to be noted. However, this time delay can be compensated for with appropriate learning scenarios design. In summary, high accuracy GPS antennas seem being beneficial to learning scenarios but require careful context-spe-cific prior evaluation.