Method for acquiring radial direction water velocity in acoustic Doppler current profiler

A technology of acoustic Doppler and water flow velocity, applied in fluid velocity measurement, velocity/acceleration/shock measurement, instruments, etc. Distance, simple steps and accurate measurement results

Active Publication Date: 2014-03-12
NANJING SHIHAI ACOUSTIC TECH CO LTD
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Problems solved by technology

However, when using conventional methods to detect broadband signals, usually only the center frequency or several frequency points

Method used

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  • Method for acquiring radial direction water velocity in acoustic Doppler current profiler
  • Method for acquiring radial direction water velocity in acoustic Doppler current profiler
  • Method for acquiring radial direction water velocity in acoustic Doppler current profiler

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Embodiment Construction

[0016] The principle and implementation process of the present invention will be further elucidated below in conjunction with specific embodiments. It should be understood that this embodiment is only used to illustrate the present invention and not to limit the scope of the present invention.

[0017] Such as figure 1 As shown, it means that the matching signal is generated by increasing the sampling frequency, so as to realize the complete matching between the matching signal and the echo signal with reduced frequency, that is, the matched filtering result reaches the maximum value. figure 1 (a) is the waveform of the transmitted signal s(n), which produces scattered echoes through the scatterers in the water body and is received by the acoustic wave transducer. In the case of positive radial velocity v, the Doppler shift is negative (where f 0 represents the frequency of the transmitted signal), so the frequency of the echo signal decreases and the waveform changes, suc...

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Abstract

The invention relates to a method for acquiring radial direction water velocity in an acoustic Doppler current profiler. The acoustic Doppler current profiler adopts an acoustic wave transducer as a sensor, an emitted acoustic impulse generates a scatter echo through an irregular scatterer in a water body, the acoustic wave transducer receives the scatter echo, and the radial direction water velocity is acquired through analysis. The method is characterized by comprising the following steps: firstly, setting a search scope and a count of radial direction water velocity according to the direction and degree of urgency of water flow in measurement environment; and secondly, designing a matching signal corresponding to radial direction velocity of each search point, carrying out matched filtering operation on the matching signal corresponding to each radial direction velocity and an echo signal received by the acoustic wave transducer, and searching a matched filtering result, wherein the radial direction velocity corresponding to a maximum value of the matched filtering result is the radial direction velocity to be measured.

Description

technical field [0001] The invention relates to a method for acquiring radial water flow velocity in an acoustic Doppler velocity profiler (ADCP), and belongs to the technical field of underwater acoustic signal measurement. Background technique [0002] Different from propeller and electromagnetic current meters, the acoustic Doppler current profiler (Acoustic Doppler Current Profiler, ADCP) uses an acoustic transducer as a sensor, and the sound pulse emitted by it passes through the unevenly distributed sediment particles in the water body. , Plankton and other scatterers produce scattered echoes, which are received by the acoustic wave transducer and estimated by Doppler frequency shift to calculate the radial flow velocity, that is, the part of the water flow velocity parallel to the acoustic wave beam emitted by the acoustic wave transducer, and then according to The angle between the sound beam and the direction of the water flow calculates the water velocity. ADCP ca...

Claims

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Application Information

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IPC IPC(8): G01P5/24
Inventor 方世良韩宁
Owner NANJING SHIHAI ACOUSTIC TECH CO LTD
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