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Method of effectively improving flow direction measurement precision of acoustic doppler current profiler

An acoustic Doppler, measurement accuracy technology, applied in fluid velocity measurement, liquid/fluid solid measurement, velocity/acceleration/shock measurement, etc., can solve the output error of magnetic north angle, mathematical analysis and mathematical correction has not seen relevant reports , flow direction error and other problems, to achieve the effect of improving environmental adaptability and improving long-term flow direction measurement accuracy

Active Publication Date: 2015-10-07
XIAMEN UNIV
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Problems solved by technology

[0005] Among the analysis of many error sources and countermeasures, there is little discussion on the magnetic north angle output error caused by the internal magnetic compass of ADCP affected by various magnetic fields in the environment—the flow direction error caused by the error
For the suppression of flow direction error caused by misalignment, the general method is to solve it by connecting an external compass or GPS [10,11] , there is no relevant report on the mathematical analysis and mathematical correction of the ADCP flow direction output affected by the differential

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  • Method of effectively improving flow direction measurement precision of acoustic doppler current profiler

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Embodiment Construction

[0041] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0042] (1) In the waters of Zhangzhou, Fujian, a buoy of a unit is carried, and the ADCP of Nortek Company of Norway is used for long-term fixed-point flow measurement. The ADCP transmission frequency is 1MHz, the blind zone depth is set to 0.2m, the layer thickness is 1m, the transmission time interval is 1s, and the average time is 100s. Since the composition of the buoy part contains ferrous materials, it will affect the ADCP flow direction measurement. From 12:00 of a certain day to 13:00 of the next day, 150 azimuths were measured within the range of [0°, 360°) azimuths, and the measured value of the magnetic north angle affected by the ambient magnetic field was obtained through the ADCP internal magnetic compass;

[0043] (2) Calibrate the output relative reference of the external high-precision magnetic compass so that it is consistent with t...

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Abstract

Provided is a method of effectively improving the flow direction measurement precision of an acoustic doppler current profiler (ADCP), relating to an ADCP. The method comprises: firstly, establishing a mathematic model, analyzing the relation between magnetic north angle change and final flow direction change, and obtaining that an angle variable quantity is equal to a flow direction variable quantity when only the magnetic north angle change exists; and based on the above, using a least square method to fit errors of a flow direction influenced by magnetism, and using a fitting coefficient to compensate for ADCP actual measurement flow direction output. Compared with a standard flow direction, the root-mean-square value of the errors of a flow direction influenced by magnetism can be reduced by 70%. The method can effectively compensate for the flow direction error of an ADCP internal magnetic compass caused by environmental magnetic field interference in an azimuth scope of 0-360 DEG, thereby substantially improve flow direction measurement precision in an omnibearing scope, and have engineering guidance value for long-term fixed point flow measurement in sea observation.

Description

technical field [0001] The invention relates to an Acoustic Doppler Current Profiler (Acoustic Doppler Current Profiler, ADCP), which belongs to the technical field of marine observation instruments, and in particular relates to a method for effectively improving the flow direction measurement of an Acoustic Doppler Current Profiler for correcting the actual flow direction error of the ADCP. method of precision. Background technique [0002] ADCP is an instrument that uses the principle of acoustic Doppler to measure the velocity and flow of water flow. Using the offset between the echo frequency received by the ADCP transducer and the transmission frequency, the velocity of the particles in the water can be calculated to obtain the movement velocity of the water flow, and then the flow of water flowing through the section within a certain period of time can be known. [1] . ADCP has become an important flow measuring instrument in oceans, rivers and other water bodies. ...

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Application Information

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IPC IPC(8): G01P5/24G01P13/02G01F1/66
Inventor 戴昊商少平贺志刚刘轲魏国妹
Owner XIAMEN UNIV
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