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Acoustic Doppler current profiler (ADCP) velocity measurement ambiguity resolution method under low noise-to-signal ratio

A fuzzy method, low signal-to-noise ratio technology, applied in measurement devices, fluid velocity measurement, velocity/acceleration/shock measurement, etc., can solve problems such as unpublished technical details, large offset wrong solutions, and lack of flow velocity, etc. Achieve the effect of increasing the defuzzification range, solving speed measurement ambiguity, and ensuring the accuracy of defuzzification

Active Publication Date: 2016-12-21
NANJING SHIHAI ACOUSTIC TECH CO LTD
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Problems solved by technology

This kind of defuzzification method is generally adopted by well-known ADCP manufacturing companies including RDI, TRDI, SonTek, etc., but some specific technical details have not been announced.
In addition, when the signal-to-noise ratio of the echo signal is low, the position of the peak value of the echo signal correlation function will be greatly shifted, resulting in wrong defuzzification, and the accurate flow velocity cannot be obtained

Method used

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  • Acoustic Doppler current profiler (ADCP) velocity measurement ambiguity resolution method under low noise-to-signal ratio
  • Acoustic Doppler current profiler (ADCP) velocity measurement ambiguity resolution method under low noise-to-signal ratio
  • Acoustic Doppler current profiler (ADCP) velocity measurement ambiguity resolution method under low noise-to-signal ratio

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Embodiment Construction

[0017] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0018] Such as figure 1 As shown, the specific implementation process of the ADCP solution to the speed measurement fuzzy method under low signal-to-noise ratio. For the measurement environment, the flow measurement is divided into 30 layers, the preset Doppler frequency offset is from 100Hz to 21000Hz, increasing layer by layer, the frequency interval is 700Hz, and the signal-to-noise ratio of the signal is 3Db. In this example, the transmitting signal of ADCP is a binary coded pulse modulation si...

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Abstract

The invention discloses an acoustic Doppler current profiler (ADCP) velocity measurement ambiguity resolution method under a low noise-to-signal ratio, for solving the velocity measurement ambiguity problem existing in measurement by use of a conventional ADCP. Complex autocorrelation operation is delayed through changing echo signals, phase relations obtained through calculation under different time delays are compared, and a final solution ambiguity correction coefficient is determined. The method is characterized in that time-delay change is carried out twice, and relations between phases measured under the time-delay change of the two times and an original phase are calculated, such that the solution ambiguity scope is enlarged while solution ambiguity accuracy is ensured.

Description

technical field [0001] The invention relates to an ADCP solution velocity measurement fuzzy method under low signal-to-noise ratio, in particular to a method for correcting the algorithm error of an acoustic Doppler velocity profiler, and belongs to the technical field of underwater acoustic signal measurement. Background technique [0002] Acoustic Doppler Current Profiler (ADCP) is a speed measurement sonar that works on the Doppler principle, and is widely used in marine environmental monitoring, marine development, marine scientific research and other fields. ADCP obtains the Doppler frequency deviation in the echo signal through the complex autocorrelation algorithm, so as to obtain the current velocity of the water flow. The main idea is to use the phase difference between the two echo signals, and obtain the frequency information through the derivative of the phase difference. [0003] In the ADCP system, use the complex autocorrelation algorithm to obtain the phase ...

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Application Information

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IPC IPC(8): G01P5/24
CPCG01P5/241
Inventor 方衍方世良徐祥
Owner NANJING SHIHAI ACOUSTIC TECH CO LTD
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