Analysis and compensation of ADCP current direction error caused by ambient magnetic field

作者：Dai, Hao^*; Shang, Shaoping; He, Zhigang; Liu, Ke

来源：Flow Measurement and Instrumentation, 2016, 52: 115-120.

DOI：10.1016/j.flowmeasinst.2016.09.013

• Acoustic Doppler current profiler (ADCP)
• Coefficients calibration
• Current direction error compensation
• Magnetic deviation

Internal magnetic compasses of acoustic Doppler current profilers (ADCPs) are easily disturbed by significant amount of hard/soft iron in some moorings or ships, causing the significant current direction error. In this paper, with the consideration of the roll and pitch of ADCPs mounted on moorings or ships, we deduce and derive the quantitative relationship between the magnetic deviation and its induced current direction error. According to the relationship and the characteristic model of the magnetic deviation, the compensated coefficients are calibrated on the spot and applied to compensate the subsequent current observation. Compared with the current direction without the magnetic deviation affection, the measured current direction accuracy evaluated by the root mean square error improves remarkably. From the experimental result, the approach is proved to be effective for correcting the fixed-point current direction measurement of ADCPs, which are affected by the magnetic deviation and in the small tilt condition.

• 出版日期2016-12
• 单位厦门大学