Array amplitude-phase consistency calibration method of parametric array, program, equipment and storage medium

Abstract

The invention belongs to the technical field of nonlinear acoustics, and particularly relates to an array amplitude-phase consistency calibration method of a parametric array, a program, equipment and a storage medium. According to the invention, by measuring the amplitude phase response of the high-frequency sound wave emitted by each array element, the amplitude phase response of the difference frequency sound wave is determined and compensated, so that the array amplitude phase consistency calibration of the parametric array in multiple test scenes such as a pool and an anechoic chamber can be realized. The method has high robustness for installation errors, and the calibrated array elements have more consistent difference frequency amplitude-phase response. The method is simple in implementation mode, can be suitable for various test scenes, provides necessary pre-calibration for beam forming of the parametric array, and has high application value.

Description

Technical Field

[0001] The present invention belongs to the technical field of nonlinear acoustics, and particularly relates to a method, program, device and storage medium for calibrating the array amplitude-phase consistency of a parametric array. Background Art

[0002] The parametric array is an important research direction in the field of nonlinear acoustics. When a transducer emits high-frequency large-amplitude sound waves, due to the acoustic nonlinear characteristics of the medium, the difference-frequency sound waves will accumulate and form in space. Due to the characteristics of low frequency and high directivity of the difference-frequency sound waves, the parametric array has advanced applications in fields such as shallow sea bottom stratigraphic profiles, active noise control, and non-destructive testing of materials.

[0003] In recent years, researchers have used the high directivity of the parametric array to form an array of parametric arrays, so as to flexibly form a local sound field or sound beam that meets a specific distribution. To avoid the influence of the initial amplitude and phase difference between array elements on the sound field distribution, it is necessary to calibrate the amplitude-phase consistency of the parametric array. Although researchers have proposed consistency calibration methods in complex test scenarios such as limited space and near field, there is currently a lack of a calibration method for the array amplitude-phase consistency of the parametric array. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, program, device and storage medium for calibrating the array amplitude-phase consistency of a parametric array. By measuring the amplitude-phase response of the high-frequency sound waves emitted by each array element in the parametric array, determining the amplitude-phase response of the difference-frequency sound waves and making compensation, it is possible to achieve the calibration of the array amplitude-phase consistency of the parametric array in multiple test scenarios such as water tanks and anechoic chambers.

[0005] The method for calibrating the array amplitude-phase consistency of a parametric array includes the following steps:

[0006] Arrange a signal generator, a power amplifier, an array of parametric arrays, a microphone, and an electroacoustic data collector; the array of parametric arrays is spaced a certain distance from the microphone;

[0007] The signal generator generates a high-frequency modulation signal according to two high-frequency original waves, which is emitted by a certain array element in the array of parametric arrays after passing through the power amplifier, and the microphone receives the sound signal;

[0008] The electroacoustic data collector synchronously collects the high-frequency modulation signal generated by the signal generator and the sound signal received by the microphone after passing through the emission of this array element, and jointly processes them to calculate the emission voltage amplitude and phase response of the two high-frequency original waves, and calculate the modulation amplitude response and phase response of this array element;

[0009] Repeat the above process for each array element in the array of parametric arrays, obtain the modulation amplitude response and phase response of each array element in the array of parametric arrays, and calculate the mean value of the modulation phase response and the minimum value of the modulation amplitude response of each array element in the array of parametric arrays;

[0010] Compensate the emission voltage amplitude and phase of each array element in the parametric array, take the difference between the modulation amplitude response of the array element and the minimum value of the modulation amplitude responses of all array elements as the emission voltage amplitude compensation value of the array element, and take the difference between the modulation phase response of the array element and the average value of the modulation phase responses of all array elements as the emission voltage phase compensation value of the array element, so as to complete the amplitude-phase consistency calibration of the parametric array.

[0011] Furthermore, the distance between the parametric array and the microphone is greater than the Rayleigh distance of high-frequency waves.

[0012] Furthermore, the signal generator generates a high-frequency modulation signal s0 according to the high-frequency original waves p1 and p2, which is emitted by the i-th array element in the parametric array after passing through the power amplifier, and the microphone receives the acoustic signal s i 。

[0013] Furthermore, the signal generator generates a high-frequency modulation signal s0 according to the high-frequency original waves p1 and p2, and the specific modulation method is:

[0014] s0(t) = w1 sin(2πf1t + ψ1) + w2sin(2πf2t + ψ2)

[0015] where w1, f1, and ψ1 are the modulation coefficient, emission frequency, and initial phase of the high-frequency original wave p1; w2, f2, and ψ2 are the modulation coefficient, emission frequency, and initial phase of the high-frequency original wave p2.

[0016] Furthermore, the electroacoustic data collector synchronously collects the high-frequency modulation signal s0 generated by the signal generator and the acoustic signal s received by the microphone i ,for s0 and s i jointly processes them, and calculates the emission voltage amplitude response and phase response of the high-frequency original wave p1 and the emission voltage amplitude response and phase response

[0017] and phase response of the high-frequency original wave p2

[0018]

[0019]

[0020] Furthermore, calculate the average value of the modulation phase responses of each array element in the parametric array Obtain the minimum value of the modulation amplitude responses of each array element in the parametric array ; for the i-th element in the array of the parametric array, the transmit voltage amplitude compensation value is The transmit voltage phase compensation value is

[0021] A computer device / equipment / system includes a memory, a processor, and a computer program stored on the memory. The processor executes the computer program to implement the steps of the above-mentioned array amplitude-phase consistency calibration method for the parametric array.

[0022] A computer-readable storage medium stores a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above-mentioned array amplitude-phase consistency calibration method for the parametric array are implemented.

[0023] A computer program product includes a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above-mentioned array amplitude-phase consistency calibration method for the parametric array are implemented.

[0024] The beneficial effects of the present invention are as follows:

[0025] By measuring the amplitude-phase responses of the high-frequency sound waves emitted by each element, determining the amplitude-phase responses of the difference-frequency sound waves and making compensations, the present invention can achieve the array amplitude-phase consistency calibration of the parametric array in multiple test scenarios such as water tanks and anechoic chambers. The present invention has high robustness to installation errors, and the calibrated elements have more consistent difference-frequency amplitude-phase responses. The implementation method of the present invention is simple, can be applied to a variety of test scenarios, provides necessary pre-calibration for the beamforming of the array of the parametric array, and has high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the layout and connection of each component when the present invention performs the array amplitude-phase consistency calibration of the parametric array.

[0027] Figure 2 It is a block diagram of the joint processing flow for the difference-frequency amplitude-phase response test.

[0028] Figure 3 It is a schematic diagram of the difference-frequency directivity formed by the array of the calibrated parametric array.

[0029] Figure 4 It is a data table of the difference-frequency amplitude-phase response test in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] The present invention provides a method for calibrating the array amplitude-phase consistency of a parametric array. By measuring the amplitude-phase responses of high-frequency sound waves emitted by each element in the parametric array, determining the amplitude-phase response of the difference-frequency sound wave and making compensation, the calibration of the array amplitude-phase consistency of the parametric array can be realized in multiple test scenarios such as water tanks and anechoic chambers.

[0032] For the array of the parametric array, the amplitude-phase response of the difference-frequency sound wave can be expressed as: the modulation amplitude-phase responses of two high-frequency sound waves multiplied by the amplitude-phase response A0 of the nonlinear acoustic channel. And A0 is independent of the response of the element emission system in the array of the parametric array. Therefore, the array consistency can be calibrated through the modulation amplitude-phase response.

[0033] The method for calibrating the array amplitude-phase consistency of a parametric array includes the following steps:

[0034] Step 1: Arrange a signal generator, a power amplifier, an array of the parametric array, a microphone, and an electroacoustic data collector; there is a certain distance between the array of the parametric array and the microphone; initialize i = 1.

[0035] Step 2: The signal generator generates a high-frequency modulation signal s0 according to the high-frequency original waves p1 and p2, which is emitted by the ith element in the array of the parametric array after passing through the power amplifier, and the microphone receives the sound signal s i ; the electroacoustic data collector synchronously collects the high-frequency modulation signal s0 generated by the signal generator and the sound signal s received by the microphone i ;

[0036] s0(t) = w1 sin(2πf1t + ψ1) + w2 sin(2πf2t + ψ2)

[0037] where w1, f1, ψ1 are the modulation coefficient, emission frequency, and initial phase of the high-frequency original wave p1; w2, f2, ψ2 are the modulation coefficient, emission frequency, and initial phase of the high-frequency original wave p2.

[0038] Step 3: Jointly process s0 and s i to calculate the emission voltage amplitude response and phase response of the high-frequency original wave p1 and the emission voltage amplitude response

[0039] Step 4: Calculate the modulation amplitude response and modulation phase response

[0040]

[0041]

[0042] Step 5: If i < N, where N is the total number of array elements in the parametric array, then set i = i + 1 and return to Step 2; otherwise, execute Step 6;

[0043] Step 6: Calculate the mean value of the modulation phase responses of each array element in the parametric array Obtain the minimum value of the modulation amplitude responses of each array element in the parametric array

[0044] Step 7: Compensate the transmission voltage amplitude and phase of each array element in the parametric array to complete the amplitude-phase consistency calibration of the parametric array;

[0045] Transmission voltage amplitude compensation value is:

[0046] Transmission voltage phase compensation value is:

[0047] Example 1:

[0048] Taking the array of an underwater acoustic parametric array as an example, the amplitude-phase consistency of each array element is calibrated in an anechoic tank. The test platform is as shown in the appendix Figure 1 , and the array of the underwater acoustic parametric array consists of 2 high-frequency transmitting transducers with a frequency of 65 kHz, and the transmitted difference frequency is 4 kHz. The difference-frequency amplitude-phase response is tested according to the joint processing flow shown in the appendix Figure 2 .

[0049] Considering the inevitable influence of installation errors in actual measurements, since the microphone is already located in the main lobe of the beam, and the influence of the transceiver distance error Δz is k d Δz (the difference-frequency wave number k d = 2πf d / c, where c is the sound speed of the propagation medium), therefore, this calibration method has high robustness to installation errors. The test data of the difference-frequency amplitude-phase response before and after calibration are shown in Figure 4 , and it can be seen that the array elements after calibration have more consistent difference-frequency amplitude-phase responses. The difference-frequency directivity after array element calibration is shown in the appendix Figure 3 , meeting the designed beam shape. It can be seen that the amplitude-phase consistency calibration method for the parametric array designed by the present invention is effective, even considering the influence of installation errors in actual measurements.

[0050] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A calibration method for the amplitude-phase consistency of an array of parametric arrays, characterized in that: Arrange a signal generator, a power amplifier, an array of parametric arrays, a microphone, and an electroacoustic data collector; there is a certain distance between the array of parametric arrays and the microphone; The signal generator generates a high-frequency modulation signal according to two high-frequency original waves, which is transmitted by a certain element in the array of parametric arrays after passing through the power amplifier, and the microphone receives the acoustic signal; The electroacoustic data collector synchronously collects the high-frequency modulation signal generated by the signal generator and the acoustic signal received by the microphone after being transmitted by this element, and jointly processes them to calculate the emission voltage amplitude and phase response of the two high-frequency original waves, and calculate the modulation amplitude response and phase response of this element; Repeat the above process for each element in the array of parametric arrays to obtain the modulation amplitude response and phase response of each element in the array of parametric arrays, and calculate the mean value of the modulation phase response and the minimum value of the modulation amplitude response of each element in the array of parametric arrays; Compensate the emission voltage amplitude and phase of each element in the array of parametric arrays. Take the difference between the modulation amplitude response of this element and the minimum value of the modulation amplitude response of each element as the emission voltage amplitude compensation value of this element, and take the difference between the modulation phase response of this element and the mean value of the modulation phase response of each element as the emission voltage phase compensation value of this element, and complete the calibration of the amplitude-phase consistency of the array of parametric arrays.

2. The method for calibrating the array amplitude-phase consistency of the parametric array according to claim 1, wherein: The distance between the array of parametric arrays and the microphone is greater than the Rayleigh distance of the high-frequency wave.

3. The method for calibrating the array amplitude-phase consistency of the parametric array according to claim 1, characterized in that: The signal generator generates a high-frequency modulation signal s0 based on high-frequency original waves p1 and p2, which is transmitted by the i-th element in the array of the parametric array after passing through a power amplifier, and the microphone receives the acoustic signal s i .

4. The method for calibrating the array amplitude-phase consistency of the parametric array according to claim 3, characterized in that: The signal generator generates a high-frequency modulation signal s0 according to the high-frequency original waves p1 and p2. The specific modulation method is: s0(t) = w1sin(2πf1t + ψ1) + w2sin(2πf2t + ψ2) Where, w1, f1, ψ1 are the modulation coefficient, emission frequency, and initial phase of the high-frequency original wave p1; w2, f2, ψ2 are the modulation coefficient, emission frequency, and initial phase of the high-frequency original wave p2.

5. The method for calibrating the array amplitude-phase consistency of the parametric array according to claim 3, wherein: The electroacoustic data collector synchronously collects the high-frequency modulation signal s0 generated by the signal generator and the acoustic signal s received by the microphone i , and jointly processes s0 and s i to calculate the transmitted voltage amplitude response and phase response of the high-frequency original wave p1 and the transmitted voltage amplitude response 6. The method for calibrating the array amplitude-phase consistency of the parametric array according to claim 5, characterized in that: The modulation amplitude response of the i-th array element in the parametric array and the phase response are calculated as follows:

7. The method for calibrating the array amplitude-phase consistency of the parametric array according to claim 6, characterized in that: Calculate the mean value of the modulation phase responses of each array element in the parametric array Obtain the minimum value of the modulation amplitude responses of each array element in the parametric array For the i-th array element in the parametric array, the transmitted voltage amplitude compensation value is The transmitted voltage phase compensation value is 8. A computer device / apparatus / system, comprising a memory, a processor, and a computer program stored on the memory, characterized in that: The processor executes the computer program to implement the steps of the method described in any one of claims 1 to 7.

9. A computer-readable storage medium having computer programs / instructions stored thereon, characterized in that: When the computer program / instructions are executed by the processor, the steps of the method described in any one of claims 1 to 7 are implemented.

10. A computer program product, comprising a computer program / instructions, characterized in that: When the computer program / instructions are executed by the processor, the steps of the method described in any one of claims 1 to 7 are implemented.

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