Abstract:
Wireless sensor networks hold the promise of many new applications in the area of
monitoring and control. In most applications if location information of the sensing
node is not available, measured data from sensing node become meaningless.
Iterative techniques are widely used to enhance localization coverage. Main problem
with iterative technique is error propagation. So this research proposes a
mechanism to improve the localization coverage as well as a new technique to
minimize the error propagation.
new
Localization coverage improvement is based on the 2 hop neighbors (referred as
“New method”). When a location unknown node has only 2 anchor node in its radio
range, location can’t be determined. But if 2 hop anchors are available with
satisfying a certain criteria location can be determined as shown in this research. In
Iterative techniques once location is determined it is upgrade to anchor status. Ifthis
node upgrade is handled more carefully error propagation can be minimized. So this
research proposed Distance Measurement Error based node upgrade to minimize the
errors.
Simulations were carried out for three simulation scenarios to demonstrate the
performance improvement of the proposed techniques. According to the simulation
results obtained, 7% improvement for localization coverage and 4% improvement for
localization accuracy from the DME based anchor node upgrade were achieved with
respect to standard trilateration.
Citation:
Wicramasinghe, G.B. (2014). Sensor node localization in the presence of limited anchor nodes [Master's theses, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.mrt.ac.lk/handle/123/14133