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We consider a range estimation algorithm based on the time-of-arrival differences between multipath replicas of a signal transmitted by an anchor node of known location to a silent node that needs to localize itself. We consider the geometry of the problem in the simplified case of a constant sound speed profile (SSP), and argue that the more realistic case of a non-constant SSP can be still tackled...
In this paper, we present a performance evaluation of two underwater network protocols, named GUWMANET and Dflood. The protocols were tested at sea during the final demonstration of the EDA project Robust Acoustic Communication in Underwater Networks (RACUN). The project started in 2010 with the goal to develop and demonstrate the capabilities of an underwater ad-hoc acoustic network. The trial took...
The recent years increasing interest for research on underwater communication and networking has sparked the interest for a software defined modem (SDM). This concept has been realized on a sophisticated hardware platform, which is provided in form of the commercially available develogic Hydro-Acoustic Modem HAM.Base. This is a small sized, energy efficient, and deep water approved underwater communication...
There are currently no digital underwater communications standards. In this paper we describe JANUS, a simple multiple-access acoustic protocol designed and tested by the NATO Centre for Maritime Research and Experimentation (CMRE) over the past 6 years that provides a basic and robust tool for collaborative underwater communications. JANUS is in process to become a NATO standard but is not intended...
The terrestrial communication enables Internet-based, comprehensive and system-wide telecommunication services. However, these bandwidth-intensive developments fail for the underwater area – why? The purpose of this article is to provide first approach to a possible key solution for robust point to point acoustic communication in an underwater environment. A cognitive system involving model based...
Underwater networks move more and more into the focus of the research community, especially for military purposes. They enable the full integration of underwater components like submarines or sensor platforms into maritime Network Centric Warfare (NCW). Nevertheless, most of the scientific work was done in physical layer methods and medium access protocols. In this paper we introduce a new network...
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