Real-Time Tracking of Transceiver-Free Objects for Homeland Security

The increasing demand in homeland security speeds up the development of innovative and non‐invasive systems to localize and track moving objects in complex environments. In this paper the real‐time localization of transceiver‐free targets is addressed by means of learning by example methodology that exploits the received signal strength indicator available at the nodes of a wireless sensor network as input data. This approach uses neither dedicated sensors nor active devices put on the target to localize both idle and moving objects. The definition of a customized classifier during an offline training procedure enables the real‐time generation of a probability map of presence by processing the output of the support vector machine. Some selected experimental results validate the effectiveness of the proposed methodology applied in real scenarios.