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| Research on Field Calibration Method of ADCP Velocity Based on Frequency Offset Response |
| GUO Shi-xu,YANG Xiao-jie,WANG Yue-bing,YE Xiao-tong,ZHAO Peng |
| College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract With the regard to the difficulty in field calibration of Acoustic Doppler Current Profiler (ADCP), a field calibration method of ADCP velocity based on frequency offset response is introduced. Through the acoustic signal transponder, the frequency offset of the back signal relative to the transmitted signal is set to simulate the velocity vector, in addition, frequency is taken as the traceability quantity to carry out frequency calibration on the signals emitted by ADCP and the offset signals sent back by the transponder, so as to realize the field calibration of the velocity parameters of ADCP. A field calibration device of ADCP velocity based on frequency offset response is developed. In the laboratory anechoic tank condition, four-beam 300kHz ADCP was used as the calibration object, carried out a velocity calibration experiment of 1 to 2m/s and performed uncertainty analysis. The results show that the uncertainty of the flow rate calibration is 1% simulated flow rate +7mm/s, which verifies the feasibility of the calibration method.
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Received: 08 November 2019
Published: 19 January 2021
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2021, Vol. 42 
