Localization and Its Effects an Data Delivery in Underwater Sensor Networks
Author: Melike Erol
Publisher:
Published: 2009
Total Pages: 108
ISBN-13:
DOWNLOAD EBOOKUnderwater Sensor Networks (USN) are used for tough oceanographic missions where human operation is dangerous or impossible. USNs consist of tethered (stationary) or untethered (mobile) sensor nodes. When the nodes are untethered, they move passively with the currents. A realistic mobility model is required to capture this mobility pattern. In our studies we collaborate in an oceanographic mobility model. We use this model to evaluate the performance of the proposed protocols under a mobile network. Localization and data delivery are among the fundamental tasks in USNs. In this study, we propose two localization algorithms. The proposed techniques are evaluated by simulation. We propose Dive and Rise Localization (DNRL) and Proxy Localization (PL). We compare their performance with a recognized technique from the literature. The simulation results show that DNRL has high localization success, high accuracy, low energy consumption and low overhead. Hence, it outperforms the other techniques for the mobile USN. DNRL and PL are shown to be energy efficient and suitable for long-term underwater missions. In our studies, we also analyze data delivery in stationary USNs. We employ a greedy, location-based routing algorithm and investigate its performance under location inaccuracies. We analyze the delivery ratio, overhead and average end-to-end delay of the location-based routing protocol when localization techniques are employed for location estimation. Our simulations show that location estimates with low mean error do not have significant affect. However, when location estimates with higher location inaccuracy are used, the delivery ratio of the routing protocol decreases significantly.