Ubiquitous User Localization for Pervasive Context-Aware Construction Applications - Mobile and Pervasive Computing in Construction - page 108

Figure 6.22 Ekahau calibration and testing inside the Construction Engineering
Laboratory

The objective was to track a mobile user's position and head orientation in real time
as the user walked inside the laboratory. As mentioned in Section 6.4, this was
achieved by combining the positioning information (X, Y, floor level) obtained
from Ekahau (2007) and orientation information (roll, yaw, and pitch) obtained
from the orientation in one tracking application.
To visualize how the mobile user is being continuously tracked in the laboratory
using the tracked user's position and head orientation, a 3D environment with
sufficient underlying computer graphics support to allow the manipulation of
entities in a 3D scene was needed. A computer graphics toolkit namely Open-
SceneGraph (OSG) (2005) within Visual C

.NET, was adopted. A selected
snapshot of virtual views taken during the experiments, conducted on the first floor
of GGB Building (Construction Engineering Laboratory), is shown in Figure 6.23.
A similar experiment using Ekahau was conducted on the second floor of GGB
building, namely the Civil Engineering Department (Figure 6.24).

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Figure 6.23 Virtual representation for indoor tracking of amobile user usingWLAN
(Construction Engineering Laboratory