Date Added: Dec 2009
Sensor localization in wireless sensor networks is an important component of many applications. Previous work has demonstrated how localization can be achieved using various methods. In this paper, the authors focus on achieving fine-grained localization that does not require external infrastructure, specialized hardware support, or excessive sensor resources. They use a real sensor network and provide measurements on the actual system. They adopt a localization approach that relies on acoustic sounds and clock synchronization. The contribution of their work is achieving consistent sound pulse detection at each sensor and precise range estimation using a high-precision clock synchronization implementation. They first describe their technique and then they evaluate their approach using a real setup.