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dc.contributor.authorVermeij, Arjan
dc.contributor.authorMunafò, Andrea
dc.date.accessioned2019-06-20T09:22:04Z
dc.date.available2019-06-20T09:22:04Z
dc.date.issued2019/06
dc.identifier.govdocCMRE-PR-2019-111en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12489/851
dc.description.abstractThe proliferation of deployed sea-going autonomous platforms, such as autonomous underwater vehicles (AUVs), unmanned surface vehicles (USV), and sensor nodes anchored to the seabed, makes the deployment of true underwater acoustic networks more and more feasible. An important feature of any network is the ability to synchronize the clocks of the participants, for the purpose of, e.g., time-slotted media access control (MAC) and navigation. Terrestrial clock synchronization protocols, such as the wellestablished network time protocol (NTP), are not readily applicable to underwater acoustic networks, because of long propagation times, low packet delivery success rates, communication ranges that vary over time in an unpredictable manner, and, in the presence of mobile nodes, the ad hoc nature of the composition of the network. This paper proposes a continuous estimation of internode clock offset and drift, based on the continuous exchange of modem packets, possibly containing transmission and reception timestamps. The proposed solution takes explicitly into account the limitations of the acoustic communication channel and network node mobility. This robust, opportunistic clock synchronization (ROCS) is robust against modem reset, and will work even if packet delivery success rates are not optimal or if no communication is possible for extended periods of time. Experimental results are given from the COLLaborative Asw Behaviours' Next Generation Autonomous Systems (COLLAB-NGAS14) campaign, held October 19-31, 2014, off the west coast of Italy. During the sea trial, the proposed clock synchronization algorithm was deployed and successfully tested within an underwater acoustic network composed of mobile and fixed nodes.en_US
dc.format12 p. : ill. ; digital, PDF fileen_US
dc.language.isoenen_US
dc.publisherCMREen_US
dc.sourceIn: IEEE Journal Of Oceanic Engineering, vol. 40, no. 4, October 2015, pp. 841-852, doi: 10.1109/JOE.2015.2469955en_US
dc.subjectAcoustic communicationsen_US
dc.subjectUnderwater communicationsen_US
dc.subjectSensor networksen_US
dc.subjectUnderwater surveillanceen_US
dc.subjectCommunication networksen_US
dc.subjectNavigation and positioning systemsen_US
dc.subjectAcoustic navigationen_US
dc.subjectClock synchronizationen_US
dc.subjectAlgorithmsen_US
dc.titleA robust, opportunistic clock synchronization algorithm for ad hoc underwater acoustic networksen_US
dc.typeReprint (PR)en_US
dc.typePapers and Articlesen_US


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