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Flow field data correction method for acoustic Doppler flow velocity profiler

An acoustic Doppler and Doppler flow velocity technology, applied in the field of flow field data correction, can solve the problems of result error, error accumulation, random noise of radial flow velocity and even outliers, etc., to achieve accurate flow velocity data and reduced radial flow velocity. Effect

Active Publication Date: 2015-04-08
NANJING SHIHAI ACOUSTIC TECH CO LTD
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Problems solved by technology

Due to the complex and changeable water body environment, after the echo signal passes through the complex autocorrelation algorithm, the radial flow velocity obtained contains random noise or even outliers. result in greater error

Method used

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  • Flow field data correction method for acoustic Doppler flow velocity profiler
  • Flow field data correction method for acoustic Doppler flow velocity profiler
  • Flow field data correction method for acoustic Doppler flow velocity profiler

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Embodiment Construction

[0020] see figure 1 , taking four beams as an example, describing the positions of beam 1, beam 2, beam 3, and beam 4, showing that the beam angle is the angle between each beam and the central axis, and the XYZ axis of the instrument coordinates and the positions of the four beams relation.

[0021] figure 2 It shows the plane display of beam 1 and beam 2 in the ADCP configured by JANUS during the navigation measurement, which can have a clearer understanding of the entire ADCP measurement system.

[0022] The experimental data is measured in the underwater acoustic laboratory of Southeast University. The instrument used is the ADCP configured by JANUS, then M=4, and the length, width and height of the pool are 10×4×7m. At this time, the system frequency of ADCP is f 0 =600khz, the beam angle θ is 20°, the sound velocity C is 1500m / s, the layer thickness set by ADCP is 0.2m, the depth of ADCP entering the water is 0.3m, and the dead zone of ADCP itself is 0.2m, so the dept...

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Abstract

The invention relates to a flow field data correction method for an acoustic Doppler flow velocity profiler. The acoustic Doppler flow velocity profiler adopts an acoustic transducer serving as a transducer, acoustic pulses emitted by the acoustic transducer generate scatter echoes through scatterers in unit layers in different water depths, and the scatter echoes are received by the acoustic transducer and analyzed and processed to obtain a radial water velocity. The flow field data correction method for the acoustic Doppler flow velocity profiler is characterized in that the multilayer flow velocity fitting type flow field data correction method is adopted for wild value elimination of radial flow velocity data of each wave beam to realize polynomial fitting, abnormal values of the radial flow velocity are eliminated while changing curves of the radial flow velocity along with depth are smoothened, and accurate flow velocity information under an instrument coordinate system is further acquired.

Description

technical field [0001] The invention relates to a flow field data correction method for an acoustic Doppler velocity profiler (ADCP), belonging to the technical field of underwater acoustic signal measurement. Background technique [0002] ADCP is an instrument that uses the principle of acoustic Doppler to measure flow velocity and flow. The number of different ADCP transducers is different. The transducer and the ADCP axis form a certain angle. Each transducer is both a transmitter and a receiver. The sound waves emitted by the transducer are concentrated in a narrow range, also called a beam. One ADCP is equivalent to several traditional current meters when working. To obtain a flow velocity profile, ADCP needs to measure the flow velocity at different water depths, which involves the spatial stratification of water flow. ADCP can use time as the scale to collect echoes of different depth unit layers in space, measure and calculate the radial flow velocity of each layer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/02
Inventor 方世良周翠翠韩宁
Owner NANJING SHIHAI ACOUSTIC TECH CO LTD
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