Marine Current Meter Calibration Using GNSS Receivers, a Comparison with Commercial Method
Publish place: Civil Engineering Journal، Vol: 2، Issue: 4
Publish Year: 1395
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_CEJ-2-4_001
تاریخ نمایه سازی: 16 شهریور 1395
Abstract:
Getting information from marine current requires that accurate and calibrated current meter is used. Current meter calibration is carried out in accordance with specific standard in calibration laboratories. To evaluate the performanceand health of a current meter, one should compares velocity and heading it with a velocity and heading reference. In thispaper, the innovative method for evaluate velocity and heading resulted from impeller marine current meter is presented. In this method, current meter is to be attached to buoy that is installed on it tow GNSS receivers; and by towing it in alake, simultaneous velocity and heading of the current meter are recorded. Also data position of buoy by GNSS is recorded. Accurately calculated velocity and heading of buoy by using GNSS data to be used as a criterion to evaluate the current meter velocity and heading. Finally, the calibration equation that is known as the final result of the calibrationprocess was determined for velocity and heading of current meter with reasonable accuracy. Also, current meter is tested in this paper evaluated commercial method in calibration laboratory. The results were compared with the results of the proposed method. The results indicated the success of the GNSS-based method for the Performance analysis of a marine current meter
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Authors
Vahid Rezaali
M.Sc student of hydrography , School of Surveying and Geospatial Eng., Faculty of Engineering, University of Tehran, Tehran, Iran
Alireza A. Ardalan
professor of geodesy, School of Surveying and Geospatial Eng., Faculty of Engineering, University of Tehran, Tehran, Iran