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21011 Scheduled MAC in Beacon Overlay Networks for Underwater Localization and Time-Synchronization
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van Kleunen, W.A.P. and Meratnia, N. and Havinga, P.J.M. (2011) Scheduled MAC in Beacon Overlay Networks for Underwater Localization and Time-Synchronization. In: The Sixth ACM International Workshop on Underwater Networks (WUWNet) , 1-2 Dec 2011, Seattle, USA. 6:1-6:5. ACM. ISBN 978-1-4503-1151-9

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In this article we introduce a MAC protocol designed for underwater localization and time-synchronisation. The MAC protocol assumes a network of static reference nodes and allows blind nodes to be localized by listening-only to the beacon messages. Such a system is known to be very scalable. We show localization and time-synchronization algorithms can be designed for listen-only blind nodes by adapting the equations from GPS. We extend the set of GPS equations with angular information to reduce the number of beacons a blind node has to receive before it can determine its position.

We evaluate scheduled and unscheduled communication for sending reference-beacon message using simulation mechanisms. Our experimental results show that when energy-consumption of the beacons is of concern or when the modulation rate is low (≤ 1kbps), scheduled communication is preferred. For systems which are not concerned with the energy-consumption of the beacons, unscheduled communication delivers more messages to the blind-nodes and localization and time-synchronization are performed faster in case of high modulation rates (5kbps and 10kbps).

Item Type:Conference or Workshop Paper (Full Paper, Talk)
Research Group:EWI-PS: Pervasive Systems
Research Program:CTIT-WiSe: Wireless and Sensor Systems
Research Project:SeaSTAR: Underwater Monitoring Platforms
ID Code:21011
Deposited On:19 December 2011
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