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| Research on Inter-beam Interference in ADCP Laboratory Calibration Based on Echo Model Simulation |
| LIU Jian-Yao,JIAO Jun-sheng,GUO Shi-xu,ZHANG Ji-wei |
| School of Metrology and Testing Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China |
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Abstract Aiming at the problem of low calibration efficiency of acoustic Doppler current profiler (ADCP) in water environment, a simultaneous calibration scheme of multiple beams in laboratory pool environment is proposed. The accuracy of the model is verified by establishing an accurate simulation echo model, and the lake test experiment is carried out to verify the accuracy of the model. The echo model is sent back to the laboratory anechoic tank through the transducer, which can realize the simultaneous calibration of multiple ADCP beams, and use the echo model to explore the interference error between beams during calibration. In the bottom tracking calibration mode, the interference error between beams is positively correlated with the bottom velocity. When the velocity is below 1.6m/s, the relative error is below 0.5%. When it exceeds 1.6m/s, the error exceeds the measurement accuracy of the experimental ADCP. The interference error between beams in the water tracking calibration mode exhibits the characteristics of Gaussian noise, and the relative error is concentrated around 0%. The experimental and simulation results prove the feasibility of the simultaneous calibration scheme of multiple beams in ADCP laboratory, and the error can be controlled within the measurement accuracy range after effective shielding.
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Received: 04 August 2022
Published: 27 December 2023
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2023, Vol. 44 
