The problem of high-precision bottom-following in the proximity of the seabed for open-frame UUVs (Unmanned Underwater Vehicles) is addressed. The suggested approach consists of the integration of a guidance and control system with an active multi-hypothesis extended Kalman filter, able to estimate the motion of the vehicle with respect to the bottom profile. The guidance module is based on the definition of a suitable Lyapunov function associated with the bottom-following task, while the motion controller is a conventional auto-pilot, performing auto-heading, auto-depth, and auto-speed. The motion of the vehicle is estimated from range and bearing measurements supplied by a high-frequency pencil-beam profiling sonar. Moreover, a general-purpose sensor-based guidance and control system for advanced UUVs, able to manage active sensing-based guidance and motion estimation modules, is presented. An application of the proposed architecture to execute high-precision bottom-following using Romeo, a prototype UUV, developed by the Robotics Department of the Instituto Automazione Navale, is described. Experimental results of tests, conducted in a high-diving pool with the vehicle equipped with a sonar profiler, are presented.


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    Title :

    Active sonar-based bottom-following for unmanned underwater vehicles


    Additional title:

    Navigation eines automatischen Unterwasserfahrzeuges in konstanter Entfernung zum Seeboden mittels einer Ultraschall-Entfernungsmessung


    Contributors:
    Caccia, M. (author) / Bruzzone, G. (author) / Veruggio, G. (author)

    Published in:

    Publication date :

    1999


    Size :

    10 Seiten, 12 Bilder, 18 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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