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A Combined Pulse Velocimetry Method for Acoustic Doppler Velocity Profiler

A technology of acoustic Doppler and combined pulses, applied in fluid velocity measurement, velocity/acceleration/shock measurement, instruments, etc., can solve problems such as inability to meet spatial resolution requirements, achieve high spatial resolution and operating distance, and realize Effects in simple steps

Active Publication Date: 2015-09-23
NANJING SHIHAI ACOUSTIC TECH CO LTD
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Problems solved by technology

On the basis of improving frequency measurement accuracy and operating distance, this method has improved spatial resolution compared with single-bandwidth pulses, but it still cannot meet the increasing spatial resolution requirements for flow velocity profile measurement.

Method used

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  • A Combined Pulse Velocimetry Method for Acoustic Doppler Velocity Profiler
  • A Combined Pulse Velocimetry Method for Acoustic Doppler Velocity Profiler
  • A Combined Pulse Velocimetry Method for Acoustic Doppler Velocity 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 , 2 As shown, the transmitted signal is a combined pulse x=[x 1 ,x 2 ,x 3 ,...,x N , where the frequency of each sub-pulse is f i = f 0 +Δf(i-1), i=1,2,...,N. When measuring the radial flow velocity at a depth of h0, the echo signal y received by the transducer is composed of the echo sub-pulse y i composition y = [y 1 ,y 2 ,y 3 ,...,y N ]. If the Doppler shift is not 0, then the length of y is different from the length of x. Select the shorter vector in x and y to pad with zeros at the end, so that the length of the zero-padded vector is equal to the length of the longer vector. Multiply the two vectors x and y after zero padding, and pass throug...

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Abstract

The invention discloses a method for combined pulse speed measurement for an acoustic Doppler flow rate section plotter. An acoustic wave energy exchanger is adopted by the acoustic Doppler flow rate section plotter to serve as a sensor, scattering echoes are generated by sound wave pulses transmitted by the acoustic Doppler flow rate section plotter through an irregular scattering body in water, and after the scattering echoes are received by the acoustic wave energy exchanger, the radial water flow speed is obtained through analysis and processing. The method is characterized in that combined pulses serve as transmitting signals of the acoustic wave energy exchanger; after echo signals are received by the acoustic wave energy exchanger, the echo signals are multiplied by transmitted combined pulse signals; a result is analyzed through a low-pass filter wave and a following frequency spectrum, and therefore the radial flow speed needing to be measured is obtained.

Description

technical field [0001] The invention relates to a combined pulse velocity measurement method for an acoustic Doppler velocity profiler (ADCP), belonging 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 transducer, and the radial flow velocity is measured and calculated by Doppler frequency shift estimation, that is, the part of the water flow velocity parallel to the sound wave beam emitted by the sound wave transducer, and then according to the sound wave The angle between the beam and the direction of the water flow calculates the speed of the water flow. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/24
Inventor 方世良韩宁
Owner NANJING SHIHAI ACOUSTIC TECH CO LTD
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