This report describes techniques and equipment that can help surveyors obtain the best practical vertical reference for hydrographic surveys in the face of adverse tide, river stage, and wave conditions. US Army Engineer Waterways Experiment Station efforts involved evaluating a heave compensation system (HIPPY 120) selected by the National Oceanographic and Atmospheric Administration and exploring the possibility of using Doppler equipment for measuring vertical boat motion. Some specific measurement techniques for monitoring vertical references for hydrographic surveys under given field conditions are addressed. Depth transducer draft, boat flotation plane, and shore references are discussed in Part I. Dynamic vertical motions of the boat hull are discussed in Part II. Vertical displacement measurement equipment using automatic electrooptical tracking systems, video-type optical tracking systems, laser leveling systems, and satellites is assessed and found to have potential. for future consideration and application in improving survey accuracy. Evaluation of a heave compensation unit based on a pendulum-stabilized accelerometer platform (HIPPY 120) was attempted on a survey boat in the US Army Engineer District, Philadelphia. Protracted difficulties with the system prevented a quantitative evaluation. After the first installation was found to be unsuccessful, the HIPPY 120 was transferred to a survey boat in the US Army Engineer District, New York. The results, however, were much the same as in the first installation. These results lead to the conclusion that for this system to be successfully used during actual survey operations, there must be a higher-than-average level of technical skill among the personnel on the survey boat. An effort was made to validate Doppler equipment for use in heave compensation. Measurements were made at dockside and also during actual survey operations using a modified Doppler navigator. The tests conducted indicated that the measuring principle was sound but also that much additional development was needed. Funding constraints and the entry on the market of a commercial Doppler heave compensation unit resulted in the decision to discontinue development of the Government-sponsored Doppler heave compensation unit.


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    Titel :

    Evaluation of Vertical Motion Sensors for Potential Application to Heave Correction in Corps Hydrographic Surveys


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1987


    Format / Umfang :

    2126377


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :




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