A WSN Deployment Scheme under Irregular Conditions for Surveillance Applications
Imen Arfaoui, Noureddine Boudriga and Khalifa Trimeche
In wireless sensor networks (WSNs) based surveillance systems, sensors deployment is a critical task. Most of the deployment schemes assume that the deployed sensors have perfect sensing and coverage. However, irregular conditions related to the area under monitoring and the environment under which the deployment is performed may affect the deployment quality and reduce its efficiency. Among the most important irregular conditions, one can mention irregularity of area geography; variation of the wind during deployment and spatial irregularity due to obstacles. In this article, a controlled deployment strategy is presented for WSNs under irregularities. The paper focuses on the deployment of sensors dropped from quadcopters. Mathematical expressions are used to estimate the sensors dropping times, landing positions, and the probability to build a connected line of sensors. In addition, since the obstacles have negative impact on the surveillance quality, a picture-based algorithm is integrated to allow the determination of the coverage range(s) (or irregular coverage cell) of each landing point.
Keywords: WSN, surveillance, deployment scheme, irregular conditions, coverage, connectivity, mathematical expressions.