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    Successful completion of AUTOTRACKER trials

    News // September 17, 2004
    Subsea 7's Integrated Remote Technologies group has announced the successful completion of the first series of in-water trials using its Autonomous Underwater Vehicle (AUV) Geosub, fitted with a custom built AUTOTRACKER module. The trials took place withthe AUV operating on the surface in Peterhead Bay, in north-east Scotland.

    AUTOTRACKER is a research and development project, funded in part with support from the EU, designed to develop and demonstrate the technologies necessary to perform high-speed, high-resolution and low-altitude pipeline inspection using an AUV. The project focus is for the vehicle to navigate close to a pipeline using a combination of existing positional information together with a range of real-time sensor data. The overall aim is to improve the quality of inspection data, whilst retaining the cost benefits of a single AUV based mission.

    Over the past three years, AUTOTRACKER has been developed by a consortium of partners including research laboratories based at Heriot Watt University, National Technical University of Athens, and University of the Balearic Islands, together with Innovatum who supplied the pipetracker system and industrial partners BP and Alcatel Submarine Networks. Subsea 7 IRT provides the Geosub AUV system and associated technology including the multibeam and sidescan sonar systems together with integration engineering services.

    Unlike conventional AUV surveys, where the vehicle's mission is typically pre-programmed before deployment and the through-mission positioning accuracy maintained by updates transmitted from the surface vessel, AUTOTRACKER is capable of autonomously detecting a pipeline's location and thereafter maintaining relative station to ensure optimal sensor coverage as the vehicle navigates along the pipeline. If anomalies are detected, the AUV can re-plan its current mission, within pre-programmed parameters, to collect additional inspection data at higher resolution, potentially reducing the need for further dive missions. Since the inspection is performed at low-altitude, AUTOTRACKER also incorporates a 3D collision avoidance system to ensure the safety of both the vehicle and subsea installations.

    During the trials, simulation tools created a virtual pipeline within Peterhead Bay. This approach was used to confirm the correct operation of Geosub with the AUTOTRACKER module and to demonstrate its performance through mission re-planning and autonomous route corrections. The trials proved that the Geosub AUV can successfully track an unburied pipeline, and also tested the control procedures to re-acquire pipelines that move in and out of burial.

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