Ubiquitous User Localization for Pervasive Context-Aware Construction Applications - Mobile and Pervasive Computing in Construction - page 122

Table 6.2 Jumps in the ITS coordinates for short and simple walks

Walk 1 Walk 2 Walk 3 Walk 4

Last dominant PDR(Lat) 42.29406754 42.29469283 42.293688 42.29369639

Last dominant PDR(Long) -83.71153664 -83.71147129 -83.71345745 -83.71349191

Recovered GPS (Lat) 42.29407585 42.29469192 42.29368167 42.29368364

Recovered GPS (Long) -83.71152177 -83.711455 -83.71345969 -83.71347379

Jump (meter) 1.536 1.347 0.727 2.058

Table 6.3 Jumps in the ITS coordinates for short and complex walks

Walk 1 Walk 2 Walk 3 Walk 4

Last dominant PDR(Lat) 42.29369813 42.29369732 42.29370127 42.29369917

Last dominant PDR(Long) -83.7134819 -83.71344807 -83.71345722 -83.7134601

Recovered GPS (Lat) 42.29368493 42.29367664 42.29367843 42.29367342

Recovered GPS (Long) -83.7134585 -83.71346203 -83.71345254 -83.7134486

Jump (meter) 2.423 2.571 2.566 3.013

PDR during the time spent by the user inside the building (i.e. when PDR
corrections were not being updated instantaneously using the RTK-GPS).

Short and complex walks
Relatively complex walks having a duration between 3 and 5 minutes (indoors) are
classified as short and complex walks. These walks involved relatively more turns,
abrupt disturbances in motion, climbing and sideward motion. Table 6.3 summarizes
the “jumps” in the user's ITS position coordinates when the GPS is recovered.

Longer walks
Relatively complex walks having a duration over 5 minutes (indoors) are classified
as longer walks. These involve relatively more turns, abrupt disturbances inmotion,
climbing and sideward motion. Table 6.4 summarizes the “jumps” in the user's ITS
position co-ordinates when GPS is recovered.

Sustainability walk
To test the sustainability of the ITS, a very long walk (over 30 minutes) was
conducted. The walk involved a lot of turns, abrupt disturbances in motion,
climbing and sideward motion in order to simulate a mobile user's natural motion
in a complex environment. The walk was divided into six parts; three parts were of a
short duration, less than five minutes indoors, and rest were longer. At the end of

Table 6.4 Jumps in the ITS coordinates for longer walks

Walk 1 Walk 2 Walk 3 Walk 4

Last dominant PDR(Lat) 42.2936999 42.2936882 42.29393721 42.29484218

Last dominant PDR(Long) -83.71349888 83.7134695 -83.71318452 -83.71107857

Recovered GPS (Lat) 42.2936725 42.29367521 42.29390902 42.29483705

Recovered GPS (Long) -83.71349173 -83.71345096 -83.71318044 -83.71103446

Jump (meter) 3.101 2.102 3.15 3.682