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    3-Dimensional Position Determination using Ultrasonics (Nixen) 
      
    
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    A 3-D position measurement system was developed using ultrasonics to provide 
    a measure of the position of the bucket-wheel dredger discharge boom 
    relative to the conveyor hopper: 
      
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    operates in dust and fog 
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    10m volume coverage 
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    0.1m precision over all environments 
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    uses GPS-like algorithms 
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    3D Position determination using 
    Ultrasonics 
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