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Method for measuring flow-layer speed by related velocity sonar, and system thereof

A technology of relative velocity and flow layer, which is applied in the field of correlative speed measurement sonar to measure flow layer velocity, can solve problems such as difficult application, complicated theoretical expression of sonar array time-space correlation function, and lack of physical basis for simple expression

Inactive Publication Date: 2003-08-27
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0009] At present, there are obvious deficiencies in the existing correlation velocity sonar system when measuring the flow layer velocity of the fluid medium: (1) The theoretical expression of the time-space correlation function of its sonar array is quite complicated, and it is difficult to apply it in practice. The resulting simple formula lacks sufficient physical basis
(2) Fitting theoretical and experimental space-time correlation functions with simplex is not the best method
(3) It is not the best method to use the velocity corresponding to the maximum value of the time-space correlation function of the sonar array as the initial value of velocity estimation

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  • Method for measuring flow-layer speed by related velocity sonar, and system thereof
  • Method for measuring flow-layer speed by related velocity sonar, and system thereof
  • Method for measuring flow-layer speed by related velocity sonar, and system thereof

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0044] Such as figure 1 As shown, when using a related velocity measurement sonar system to measure the flow layer velocity of a fluid medium, the system is loaded on a carrier 100. The related velocity measurement sonar system generally includes a sonar array 200, a wet end 300, a dry end 400, and a terminal 500. . Among them, the sonar array 200 and the wet end 300 are installed under water, and the dry end 400 and the terminal 500 are installed on the water surface.

[0045] The structure of the related speed sonar system is as figure 2 As shown, it includes a sonar array 200 and an electronic extension; the sonar array 200 includes a receiving transducer 203, a transmitting transducer 202, and a transceiver transducer 201, which are composed of the receiving transducer 203 and the transceiver transducer 201 The receiving sonar array is composed o...

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Abstract

The system comprises following modules stored in the readable storage media of the computer: the initial module, the transmission encoding module, the transmitting / receiving module, the demodulating and filtering module, the first calculation module, the parameter module and the second calculation module and the speed module. The system executes following steps: starting, initializing, selecting transmission codes, transmitting, reading data, demodulating and filtering, calcualting, the time-space correlation function matrix in each flow layer respectively, setting up the search area in maximum likelihood method in each flow layer, solving and storing the results by using the maximum likelihood method. The time-space correlation function of the bottom media sonar matrix is expressed in compact Kummer function in the solving steps and good result according with experiments are obtained.

Description

Technical field [0001] The invention relates to a method for measuring the velocity of a fluid medium, and more specifically, to a method and a system for measuring the velocity of the flow layer with a related velocity sonar. Background technique [0002] The current acoustic correlation velocity sonar (ACCP) method for measuring the velocity of the stratosphere is summarized as follows: [0003] (1) US Patent No. 5,315,562 "Correlation Sonar System" by S.E. Bradley et al. introduces related sonar, which can be used to measure the profile of flow velocity and the velocity of the carrier in the water to the bottom. The main content of the invention has 4 aspects: [0004] (A) Transmit a complex signal, its autocorrelation function is delayed between τ=0 and τ=τ c There is a peak with unequal amplitude at each time, avoiding the use of the previous technology of emitting two pulses, which will cause interference between fluid media layers when measuring flow velocity. [0005] (B)...

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Application Information

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IPC IPC(8): G01S15/58
Inventor 朱维庆王长红
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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