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Auflistung nach Autor:in "Ehlers, Frank"

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  • Konferenzbeitrag
    Coordinated distributed mobile sensors and how to measure their performance
    (INFORMATIK 2011 – Informatik schafft Communities, 2011) Ehlers, Frank
    At present dramatic advances are seen in sensor and multi-sensor fusion techniques, in networking and multi-agent system design, and in capabilities of robotic platforms in terms of robustness and endurance. Applications for autonomous surveillance appear on the horizon, especially wanted for hazardous or dangerous environments. However, whilst for each subsystem measurements of performance exist (e.g. Receiver Operating Characteristics for sensors, data rate for networks, energy efficiency for a robotic platform), we have to find also a systematic approach on how to construct measures of performance for an entire system of distributed sensing robots. Having such a methodology available would allow the comparison of complete systems which are designed with different emphasis on sensor quality, collaboration tactics and platform capabilities, finally resulting in profound investment decisions. In this paper, we discuss two example applications, in underwater surveillance and in logistics, respectively. Furthermore, we describe the recent effort of the “Distributed Mobile Sensors Interest Group” (DMSIG) for which a roadmap towards collaborative work has been proposed. A first aim of this collaboration is to comprehensively understand how better coordination between platforms can compensate lower sensor quality.
  • Konferenzbeitrag
    A multi-agent concept for multistatic sonar
    (INFORMATIK 2010. Service Science – Neue Perspektiven für die Informatik. Band 2, 2010) Ehlers, Frank
    In this paper we present a novel and relevant application for multiagent systems which is to implement autonomy for Multistatic Sonar. Multistatic Sonar is used in Antisubmarine Warfare and exploits multiple aspects on the target generated by multiple acoustic sources and receivers. We propose to use a team of unmanned underwater vehicles starting with search operations as covert receivers and then switching to pursuit operations as actively communicating multistatic receivers. This results in a safe, persistent and efficient surveillance system. With the help of a simulation setup, we explain what are the specific challenges related to the Multistatic Sonar setup. These challenges are mainly related to the highly nonlinear measurement model and to communication constraints. We then briefly outline a potential “baseline” solution for the overall system architecture capable to face these challenges.
  • Konferenzbeitrag
    Tracking algorithms for bistatic sonar systems
    (Informatik 2009 – Im Focus das Leben, 2009) Daun, Martina; Ehlers, Frank