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Low-complexity velocity estimating method of acoustic Doppler flow measurement system

A technology of Doppler current measurement and system speed, which is applied in the signal processing field of broadband beam-steered acoustic Doppler speed measurement system, and can solve the problems of large amount of calculation in the processing flow, complex implementation, and high consumption of hardware resources.

Active Publication Date: 2013-01-30
杭州矢志信息科技有限公司
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AI Technical Summary

Problems solved by technology

Although the flow velocity estimation effect based on the multiple autocorrelation method is relatively ideal, the processing flow of this method is relatively large, the implementation is relatively complicated, and the hardware resource consumption is relatively large.

Method used

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  • Low-complexity velocity estimating method of acoustic Doppler flow measurement system
  • Low-complexity velocity estimating method of acoustic Doppler flow measurement system
  • Low-complexity velocity estimating method of acoustic Doppler flow measurement system

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Embodiment Construction

[0026] The concrete steps of the inventive method are as follows:

[0027] Step (1) Sampling the echo signal received by the transducer array to form a digital signal. Sampling frequency , the sampled signal is ,in Indicates the serial number of the sampling point, Indicates the length of the sampled number sequence.

[0028] Step (2) for each signal and local frequency is The in-phase / orthogonal carrier is multiplied to complete the quadrature spectrum shift.

[0029]

[0030] And the signal after shifting the frequency spectrum through the -3dB bandwidth is A low-pass filter to get the in-phase baseband signal and quadrature baseband signals .

[0031]

[0032] Step (3) The baseband signal is used for bottom tracking and judgment to determine the front data serial number of the bottom echo. Judgment method is: calculate point The real-time average power of the signal, The value is determined by the approximate depth of the bottom...

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Abstract

The invention relates to a low-complexity velocity estimating method of an acoustic Doppler flow measurement system. According to the conventional complex-autocorrelation-based velocity estimating method, the velocity estimating effect is good, but heavy computation is required in the processing flow of the method, the method is complex to implement, and a large number of hardware resources are consumed. By the low-complexity velocity estimating method of the acoustic Doppler flow measurement system based on the delay conjugation product technology, on the premise of guaranteeing the measurement performance, the computation for signal processing is greatly reduced, the complexity of the system is reduced, and the cost of the hardware resources is saved.

Description

technical field [0001] The invention belongs to the technical field of acoustic Doppler current measurement signal processing, and in particular relates to a signal processing method of a broadband beam-controlled acoustic Doppler velocity measurement system, which is used for equipment such as acoustic Doppler current profilers and road logs to estimate water layers Or relative to bottom motion velocity information. Background technique [0002] The acoustic Doppler current measuring system uses the underwater acoustic transducer to transmit a directional acoustic pulse signal to the water medium, and then receives the echo signal reflected from the scattering body in the seawater, and converts it into different pulse signals by using the time difference of the acoustic propagation path. The depth unit measures the frequency information of the echo signals of each layer, analyzes the Doppler frequency shift change, and converts to obtain the relative motion speed. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/24
Inventor 易志强李芸戴绍港赵知劲张福洪
Owner 杭州矢志信息科技有限公司
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