Ubiquitous User Localization for Pervasive Context-Aware Construction Applications - Mobile and Pervasive Computing in Construction - page 111

Figure 6.28 Ekahau calibration reference points
The results of this set of WLAN experiments indicated that the Ekahau tracking
system overall achieved a positioning accuracy of approximately 1.5-2 m.
6.4.2 UWB-based indoor experiments
Another set of experiments was performed using the UWB tracking system
(Multispectral Solutions, 2007). One of the validation experiments was conducted
in the same “maze” at NIST. Figure 6.30 is a plan view of the test setup (i.e. six
receivers were deployed around the maze). The positioning values were used
together (Section 6.4) with orientation values received from the magnetic tracker
and both were integrated in the graphical OSG application to visualize (in 3D) how
the user was moving in real time around the maze (Figure 6.31).
Many indoor experiments were also performed at Disaster City as part of the
response robot evaluation exercises for US&R to introduce emerging robotic
capabilities to emergency responders within their own training facilities. An
experiment was conducted in the assembly hall, where a maze is located, using
the UWB DART system. Similar experiments were also performed at NIST using
Figure 6.29 Snapshot of simulated Structural Engineering Laboratory inspection