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基于信号重采样频移处理的宽带ADCP分层校准方法

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针对宽带声学多普勒流速剖面仪(ADCP)现有校准方法无法有效实现流速分层校准的问题,提出基于信号重采样频移处理的声波应答校准方法,通过应答换能器组分别接收ADCP各波束换能器发射信号,经分段重采样、时间窗补偿等处理,产生包含多普勒频移信息的模拟回波信号,实现对宽带ADCP流速分层校准.为更符合真实水体散射情况,基于主动声呐方程建立了回波信号幅度计算模型.搭建了可适用于陆上和水下的宽带ADCP分层快速校准装置,对两个ADCP样机开展了校准实验,流速范围在 0.01～10 m/s,测量不确定度优于 0.3%v+5 mm/s(v为流速测量值)(k=2),并与水槽拖车法进行了对比验证.
Calibration of broadband ADCP for multi-cell based on frequency shift processing by signal resampling
The current calibration methods of broadband ADCP cannot effectively realize the measurement of flow rate stratification.An acoustic response calibration method based on frequency shift processing by signal resampling is proposed in this paper.This method utilizes a group of response transducers to receive the signals transmitted by each transducer of the ADCP to be calibrated,then some simulated echo signals which contain Doppler shift information are generated by the process of signal segmentation and time-window compensation.In order to be consistent with the real water scattering situation,a calculation model of the echo signal amplitude is given based on the active sonar equation.A broadband ADCP calibration system for multi-cell is established,which could be applied in on-land and underwater,and two ADCP devices are calibrated by designing some experiments.The measurement uncertainty of the calibration system is less than 0.3% v+5 mm/s(v denotes the flow velocity)(k=2)in the flow velocity range of 0.01～10 m/s.The proposed method and calibration system are also verified by comparing to the flume towing method through experiment.

acoustic response calibration methodsignal resamplingflow rate stratificationtime window compensationuncertainty assessment

随超楼、王敏、何龙标、杨平、郑慧峰

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中国计量大学计量测试与仪器学院 杭州 310018

中国计量科学研究院 北京 100029

声波应答法校准 信号重采样处理 流速分层 时间窗补偿 不确定度评定

国家重点研发计划国家自然科学基金中央科研院所基本科研业务费专项中央科研院所基本科研业务费专项

2022YFF060750351805506AKYZD2112-2AKYTC1601

2024

10.19650/j.cnki.cjsi.J2412369

仪器仪表学报
中国仪器仪表学会

仪器仪表学报

CSTPCD北大核心
影响因子：2.372
ISSN：0254-3087
年,卷(期)：2024.45(4)