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A method for optimal selection of adcp transmit frequency with environmental adaptability

A technology of environmental adaptability and emission frequency, applied in radio wave measurement systems, instruments, etc., can solve the problems of propagation loss, complex geometric scattering, and no optimal emission frequency, etc., and achieve the improvement of echo intensity and signal-to-noise ratio, echo The effect of wave signal-to-noise ratio improvement

Active Publication Date: 2021-09-28
NANJING SHIHAI ACOUSTIC TECH CO LTD
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Problems solved by technology

[0005] (2) Propagation loss: The propagation loss of sound waves underwater includes distance attenuation, seawater absorption attenuation, viscous attenuation and scattering attenuation
[0010] (3) Target intensity: the logarithm of the ratio of the echo intensity at 1 yard (1 yard = 0.9144 meters) from the target acoustic center to the incident sound intensity. Since the length of the sound wave of the ADCP is much larger than the size of the scatterer, the detection beam is in a certain seawater. The acoustic scattering in the interior belongs to Rayleigh scattering, which is more complicated than the geometric scattering of large-scale targets. At present, there are only approximate empirical formulas to calculate the target intensity
However, there is no way to select the optimal transmission frequency at present, so a scientific and practical method is urgently needed to solve the problems faced

Method used

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  • A method for optimal selection of adcp transmit frequency with environmental adaptability
  • A method for optimal selection of adcp transmit frequency with environmental adaptability
  • A method for optimal selection of adcp transmit frequency with environmental adaptability

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Embodiment Construction

[0037] combine figure 1 , for an ADCP whose working parameters (including transmit power, receiver bandwidth, transducer size, transducer directivity, transmit pulse width, etc.) have been determined, when observing a water area (scatterer concentration and average particle size are constant) There is an optimal transmit frequency that maximizes the echo strength.

[0038] According to the writings of Robert Urick, the ADCP transducer receive stage can be represented by the equation RL=SL-2TL+TS+NL. Where RL is the transducer receiving level, SL is the sound source level, TL is the one-way propagation loss, TS is the target intensity level, and NL is the background noise level. The units of the above parameters are all decibels (dB). SL, TL, TS and NL can be calculated by the following formulas:

[0039] (1) Among them, P is the transmitting power in watts (W), D is the acoustic diameter of the transmitting transducer, in meters (m), and λ is the wavelength of the transmit...

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Abstract

The present invention relates to an ADCP transmission frequency optimization selection method with environmental adaptability, comprising the following steps: S1: through the receiving level of the transducer in the receiving level of the ADCP transducer and the sound source level, one-way propagation loss, target intensity level, background Mathematical relationship between noise levels, get the sonar equation of transducer receiving level and sound source level, one-way propagation loss, target intensity level, background noise level; S2: According to the transmitting frequency, the acoustic diameter of the transmitting transducer, the transmitting sound wave The mathematical relationship between the wavelength and the sound source level can be used to obtain the calculation formula of the sound source level; S3: According to the mathematical relationship between the measurement distance, the attenuation coefficient of water to the sound wave and the one-way propagation loss, the calculation formula of the one-way propagation loss can be obtained, and other Step, obtain the optimal selection method of transmission frequency, it compares with the ADCP of fixed transmission frequency, the echo SNR of ADCP adopting the method of the present invention can improve 20dB at most.

Description

technical field [0001] The invention relates to the field of underwater monitoring, in particular to an ADCP transmission frequency optimization selection method with environmental adaptability. Background technique [0002] Acoustic Doppler Current Profiler (ADCP) is an active sonar that uses the Doppler principle to measure the stratified flow velocity and cross-section flow of water bodies. ADCP is widely used in oil and gas and mineral development, biological environment observation, ocean current scientific investigation, underwater submarine operations, long-term wave observation, fish farming management, maritime traffic safety, underwater pipeline laying, coastal engineering construction and offshore environmental monitoring and other fields. [0003] The workflow of ADCP is to first launch a short-pulse sound wave to the target water layer. After the sound wave is scattered by the water scatterer, part of the sound wave returns to the original path, and is received ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/524G01S7/539
CPCG01S7/524G01S7/539
Inventor 方世良杨永寿孙兆文
Owner NANJING SHIHAI ACOUSTIC TECH CO LTD
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