Underwater electromagnet leakage electric field signal and magnetic field signal joint correlation detection method

Abstract

The invention relates to the technical field of underwater electric field signal and magnetic field signal detection, in particular to an underwater electromagnet leakage electric field signal and magnetic field signal joint correlation detection method. The method comprises the following steps: detecting a magnet in water by combining a correlation method with signal processing; a three-axis magnetic field sensor and a three-component electric field sensor array are installed on a detection device, and two kinds of sensor alternating signals in the corresponding direction are obtained; comparing the two kinds of sensor alternating signals with an environmental noise level through a comparator to obtain discrete polarity signals; the discrete polarity signals are sent to a single-chip microcomputer; the single chip microcomputer multiplies the two discrete polarity signals in the same direction to obtain a correlation coefficient, and when the correlation coefficient reaches a preset threshold value, it is judged that the underwater magnet is detected. According to the method, different physical fields of two homologous signals are jointly processed, and the detection accuracy can be improved on the physical principle level.

Description

Technical Field

[0001] The present invention relates to the technical field of detecting electric field signals and magnetic field signals in water, and particularly to a method for jointly correlating and detecting the leakage electric field signal and magnetic field signal of an electromagnetic body in water. Background Art

[0002] In the offshore electromagnetic exploration industry, magnetic signals are generated by towing an electromagnetic body in water by a mother ship. The mother ship tows the electromagnetic body in water, controls the moving depth of the electromagnetic body in water through a depth controller, and provides a strong working current to excite the electromagnetic body in water to generate a magnetic field signal. For such an electromagnetic body in water based on the working principle of permanent magnet excitation, when the electromagnetic body in water works underwater, a magnetic field is generated by current excitation. There is not only a magnetic field signal, but also an electric field signal due to current leakage in seawater.

[0003] Through the analysis of the magnetic field and electric field signals of the measured linear array electromagnetic body in water in offshore experiments, it is found that there is a very strong correlation between the two. It is analyzed that the electric field signal comes from the leakage of the excitation magnetic field current of the underwater electromagnetic body. As homologous signals, they are strongly correlated signals. Therefore, the received three-component magnetic signal and the three-axis electrode array signal are used to realize the automatic identification and detection of the electromagnetic body in water through the method of polarity correlation.

[0004] In the prior art, usually the single electric field or magnetic field signal of the electromagnetic body in water is used for detection, and the use of the characteristic information of the physical field signal is scattered and isolated, which affects its detection efficiency under the interference of ocean environmental noise. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a method for jointly correlating and detecting the leakage electric field signal and magnetic field signal of an electromagnetic body in water, which solves the problem that the use of the single electric field or magnetic field signal of the electromagnetic body in water for detection is scattered and isolated for the characteristic information of the physical field signal, and affects its detection efficiency under the interference of ocean environmental noise.

[0006] To achieve the above purpose and other related purposes, the present invention provides a method for jointly correlating and detecting the leakage electric field signal and magnetic field signal of an electromagnetic body in water, including:

[0007] S1. Detect the electromagnetic body in water through joint signal processing by the correlation method;

[0008] S2. Install a three-axis magnetic field sensor and a three-component electric field sensor array on the detection device to obtain the alternating signals of the two sensors in the corresponding directions;

[0009] S3. Pass the alternating signals of the two sensors through a comparator and compare them with the environmental noise level to obtain discrete polarity signals;

[0010] S4. Transmit the discrete polarity signals to the single-chip microcomputer;

[0011] S5. The single-chip microcomputer multiplies two discrete polarity signals in the same direction to obtain the correlation coefficient. When the correlation coefficient reaches the preset threshold, it is determined that a magnetic body in water is detected.

[0012] In an embodiment of the present invention, the detection of the magnetic body in water by jointly processing signals through the correlation method in step S1 includes:

[0013] For the electric field signals leaked into water by the circuit of the magnetic field excited by the magnetic body in water, the magnetic field signals generated by the magnetic body in water itself, and the electric field signals leaked into water by the circuit of the excited magnetic field, the detection of the magnetic body in water is realized by jointly processing signals through the correlation method of pairwise correlation and obtaining the correlation coefficient.

[0014] In an embodiment of the present invention, the obtaining of two kinds of alternating signals of sensors in the corresponding directions in step S2 by installing a three-axis magnetic field sensor and a three-component electric field sensor array on the detection device includes:

[0015] Install the three-axis magnetic field sensor and the three-component electric field sensor array according to the same coordinate system;

[0016] The three groups of coils of the three-axis magnetic field sensor are respectively installed on the X, Y, and Z axes to measure the X, Y, and Z axis components of the magnetic field signal;

[0017] The three-component electric field sensor array is composed of electrode 1, electrode 2, electrode 3, and electrode 4. Among them, electrode 1 is installed at the coordinate origin, the potential difference measured between electrode 2 and electrode 1 is the component of the electric field signal in the Y-axis direction, the potential difference measured between electrode 3 and electrode 1 is the component of the electric field signal in the X-axis direction, and the potential difference measured between electrode 4 and electrode 1 is the component of the electric field signal in the Z-axis direction;

[0018] The three-axis magnetic field sensor and the three-component electric field sensor array are unified in the three directions of the X, Y, and Z axes of the space coordinate system;

[0019] The recognition of signals in water is realized by the method of polarity correlation. The correlation function is denoted as Re 123 , if the signal reaching the x-axis of the magnetic receiver is s(t1), the signal on the Y-axis is s(t2), the signal on the Z-axis is s(t3), and n1(t), n2(t), n3(t) are the ambient noises received, then the three-axis received signal, that is, the alternating signal of the three-axis magnetic field sensor is:

[0020] X1(t) = s(t1) + n1(t),

[0021] Y1(t) = s(t2) + n2(t),

[0022] Z1(t) = s(t3) + n3(t),

[0023] If the signal reaching the x-axis of the electric field sensor array is r(t1), the signal on the Y-axis is r(t2), and the signal on the Z-axis is r(t3), which is the alternating signal of the three-component electric field sensor array, and n1(t), n2(t), and n3(t) are the received environmental noises;

[0024] In the direction of the Y-axis, the detection function for the underwater magnet is:

[0025]

[0026] The cross-correlation coefficient between the magnetic field signal and the electric field signal of the mine-sweeping tool, and the cross-correlation coefficient between the magnetic field signal x(t) and the electric field signal y(t) is:

[0027]

[0028] Among them, R xy (τ) is the cross-correlation function between the magnetic field signal x(t) and the electric field signal y(t), and m x m y are the mean values of x(t) and y(t) respectively.

[0029] In an embodiment of the present invention, the step of passing the alternating signals of the two sensors through a comparator and comparing them with the environmental noise level to obtain discrete polarity signals includes:

[0030] The alternating signals of the three-axis magnetic field sensor pass through the comparator respectively, and the comparison threshold value of the comparator is taken as the upper limit value of the marine magnetic environment noise. After passing through the comparator, it becomes a discrete polarity signal 0 or 1;

[0031] The alternating signals of the three-component electric field sensor array pass through the comparator respectively, and the comparison threshold value of the comparator is taken as the upper limit value of the marine electric field environment noise. After passing through the comparator, it becomes a discrete polarity signal 0 or 1, which is equivalent to 1-bit quantization correlation.

[0032] In an embodiment of the present invention, the first input terminal of the comparator is used to input the alternating signals of the three-axis magnetic field sensor or the three-component electric field sensor array; the second input terminal of the comparator is used to input the comparison threshold value; the output terminal of the comparator is used to output discrete polarity signals.

[0033] In an embodiment of the present invention, the positive power supply terminal of the comparator is connected to the +3V power supply and one end of the voltage-dividing resistor, the other end of the voltage-dividing resistor is connected to the sliding end of the sliding resistor, one end of the sliding resistor is connected to the second input terminal of the comparator, and the other end of the sliding resistor is connected to the negative power supply terminal of the comparator and grounded.

[0034] The present invention also provides a combined correlation detection device for the leakage electric field signal and magnetic field signal of an electromagnetic body in water, comprising:

[0035] A processing module, configured to detect the electromagnetic body in water by performing combined signal processing through the correlation method;

[0036] A three-axis magnetic field sensor and a three-component electric field sensor array, configured to obtain alternating signals of the two sensors in corresponding directions;

[0037] A comparator, configured to compare the alternating signals of the two sensors with the environmental noise level through the comparator to obtain discrete polarity signals;

[0038] A sending module, configured to send the discrete polarity signals to a single-chip microcomputer;

[0039] A single-chip microcomputer, configured to multiply the two discrete polarity signals in the same direction to obtain a correlation coefficient, and when the correlation coefficient reaches a preset threshold, it is determined that an electromagnetic body in water is detected.

[0040] The present invention also provides an electronic device, comprising a processor and a memory, where the memory stores program instructions, and the processor runs the program instructions to implement the above-mentioned combined correlation detection method for the leakage electric field signal and magnetic field signal of an electromagnetic body in water.

[0041] As described above, the combined correlation detection method for the leakage electric field signal and magnetic field signal of an electromagnetic body in water according to the present invention has the following beneficial effects:

[0042] (1) The combined correlation detection method for the leakage electric field signal and magnetic field signal of an electromagnetic body in water according to the present invention uses the electric field signal generated by an electromagnetic body excitation device in water and the combined correlation processing method for the magnetic field signal. By jointly processing different physical fields of two homologous signals, the detection accuracy can be improved at the physical principle level.

[0043] (2) The combined correlation detection method for the leakage electric field signal and magnetic field signal of an electromagnetic body in water according to the present invention can replace the multiplication operation of linear correlation by using the logical comparison (coincidence operation) of low-power digital devices such as single-chip microcomputers, greatly reducing the amount of calculation. Description of the Drawings

[0044] Figure 1 It is a flowchart of the situation of an electromagnetic body in water being deployed under the towing state of a ship provided by an embodiment of the present application.

[0045] Figure 2 It is a correlation characteristic diagram of the magnetic field signal and electric field of an electromagnetic body in water measured at sea provided by an embodiment of the present application.

[0046] Figure 3Flow chart of the joint correlation detection method for the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application.

[0047] Figure 4 Schematic diagram of the triaxial magnetic field sensor for the joint correlation detection method of the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application.

[0048] Figure 5 Schematic diagram of the three-component electric field sensor array for the joint correlation detection method of the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application.

[0049] Figure 6 Block diagram of the correlation detection principle for the joint correlation detection method of the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application.

[0050] Figure 7 Schematic diagram of the comparator circuit for the joint correlation detection method of the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application.

[0051] Figure 8 Block diagram of the structure of the joint correlation detection device for the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application.

[0052] Figure 9 Test result diagram of the correlation detection of the magnetic signal of the underwater magnet for the joint correlation detection method of the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application.

[0053] Figure 10 Test result diagram of the correlation detection of the electric field signal in water for the joint correlation detection method of the leakage electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application. Detailed implementation manners

[0054] The following specific examples illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0055] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0056] Terms such as first or second may be used to describe various components, but these components are not limited by the above terms. The above terms are used to distinguish one component from another. For example, without departing from the scope of the concept according to the present disclosure, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component.

[0057] In addition, "connected / coupled" means that one component is directly electrically coupled to another component or indirectly electrically coupled through another component. As long as it is not explicitly stated in the sentence, the singular form may include the plural form. In addition, "comprising / including" or "comprises / includes" used in this specification means that there is or has been added one or more components, steps, operations, and elements. The specific structural or functional descriptions of the examples of the embodiments according to the concepts disclosed in this specification are only illustrated to describe the examples of the embodiments according to the concepts, and the examples of the embodiments according to the concepts can be implemented in various forms, but these descriptions are not limited to the examples of the embodiments described in this specification.

[0058] According to the concept, various modifications and changes can be applied to the examples of the embodiments, such that the examples of the embodiments will be illustrated in the drawings and described in the specification. However, the examples of the embodiments according to the concept are not limited to the specific embodiments, but include all changes, equivalents, or replacements included within the spirit and technical scope of the present disclosure.

[0059] It should be understood that when describing that one element is "coupled" or "connected" to another element, the element can be directly coupled or directly connected to another element, or can be coupled or connected to another element through a third element. On the contrary, it should be understood that when an element is referred to as "directly connected to" or "directly coupled to" another element, no other element is disposed between them. Other expressions describing the relationship between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same way.

[0060] The terms used in this specification are only used to describe the specific examples of the embodiments and are not intended to limit the present disclosure. If there is no clear contrary meaning in the context, the singular form may include the plural form. In this specification, it should be understood that the terms "including" or "having" indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the existence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0061] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. If a term defined in a commonly used dictionary is not clearly defined in this specification, it should be interpreted as having the same meaning as in the context of the relevant art and not as an ideal or overly formal meaning.

[0062] Descriptions of well-known components and processing techniques may be omitted so as not to unnecessarily obscure the embodiments of the present disclosure.

[0063] Throughout the specification, the same reference numerals refer to the same elements. Thus, even if a reference numeral is not mentioned or described with reference to one drawing, it may be referred to or described with reference to another drawing. In addition, even if a reference numeral is not shown in one drawing, it may be referred to or described with reference to another drawing.

[0064] In addition, the logic levels of signals may be different from or opposite to the described logic levels. For example, a signal described as having a logic "high" level may alternatively have a logic "low" level, and a signal described as having a logic "low" level may alternatively have a logic "high" level.

[0065] The embodiments of the present disclosure will be described in detail below with reference to the drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are provided to help readers better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present disclosure can still be implemented.

[0066] Please refer to Figure 1 、 Figure 2 , Figure 1 which is a flowchart of the deployment situation of the underwater magnet in a ship towing state provided by an embodiment of the present application. Figure 2 which is a relevant characteristic diagram of the magnetic field signal and electric field of the underwater magnet measured at sea provided by an embodiment of the present application. For such an underwater magnet based on the permanent magnet excitation working principle, when the underwater magnet works underwater, a magnetic field is generated through current excitation. There is not only a magnetic field signal, but also an electric field signal due to current leakage in seawater. Through the analysis of the magnetic field and electric field signals of the linear array underwater magnet measured in the sea trial, it is found that there is a very strong correlation between the two. It is analyzed that the electric field signal comes from the leakage of the excitation magnetic field current of the underwater magnet. As homologous signals, they are strongly correlated signals. Therefore, by using the received three-component magnetic signal and the triaxial electrode array signal, the automatic identification and detection of the underwater magnet are realized through the method of polarity correlation.

[0067] The joint correlation detection method for the leaked electric field signal and magnetic field signal of the electromagnetic body in water of the present invention aims to improve the detection probability of the magnetic body in water, and adopts the cross-correlation function of electric field / magnetic field signal detection:

[0068]

[0069] Since the distributions of the magnetic field and electric field noises in the ocean environment are anisotropic and random, and the correlation is weak. If the detection device platform is taken as the origin, and the magnetic body in water sails above the device, as the relative distance changes, the signal-to-noise ratio changes: the closer the distance, the stronger the signal, the higher the signal-to-noise ratio, the greater the correlation coefficient, and the corresponding change in the correlation peak.

[0070] Please refer to Figure 3 , Figure 3 which is the flowchart of the joint correlation detection method for the leaked electric field signal and magnetic field signal of the electromagnetic body in water provided by the embodiment of the present application. The present invention provides a joint correlation detection method for the leaked electric field signal and magnetic field signal of the electromagnetic body in water, including:

[0071] Step S1: Detect the magnetic body in water by jointly processing signals through the correlation method.

[0072] Step S2: Install a three-axis magnetic field sensor and a three-component electric field sensor array on the detection device to obtain the alternating signals of the two sensors in the corresponding directions.

[0073] Step S3: Compare the alternating signals of the two sensors with the environmental noise level through a comparator to obtain discrete polarity signals.

[0074] Step S4: Send the discrete polarity signals to the single-chip microcomputer.

[0075] Step S5: The single-chip microcomputer multiplies the two discrete polarity signals in the same direction to obtain the correlation coefficient. When the correlation coefficient reaches the preset threshold, it is determined that the magnetic body in water is detected.

[0076] Specifically, the detection of the magnetic body in water by jointly processing signals through the correlation method in step S1 includes: for the electric field signal leaked in water generated by the circuit exciting the magnetic field of the magnetic body in water, the magnetic field signal generated by the magnetic body in water itself, and the electric field signal leaked in water by the circuit exciting the magnetic field, jointly process the signals through the correlation method of pairwise correlation and obtaining the correlation coefficient to detect the magnetic body in water.

[0077] In an embodiment of the present invention, a method for jointly detecting the leakage electric field signal and magnetic field signal of an electromagnetic body in water includes: the circuit part of the magnetic field excited by the magnetic body in water leaks to generate an electric field signal, the magnetic field signal generated by the magnetic body in water itself, and the electric field signal leaked by the circuit part of the excited magnetic field in water. Through the correlation method of pairwise correlation and calculation of the correlation coefficient for joint signal processing, the detection of the magnetic body in water is realized; a three-axis electric field sensor array and a three-component magnetic sensor are installed on the detection device. The receiving components of the two sensor arrays are unified in the X, Y, and Z directions, and the alternating signals of the two sensors in the corresponding directions are obtained respectively. The alternating signals of these two types of sensors in different physical fields pass through a comparator and are compared with the ambient noise level to obtain discrete polarity signals, which enter the single-chip microcomputer. The single-chip microcomputer multiplies the two polarity signals in the same direction to calculate the correlation coefficient. When the correlation coefficient reaches the preset threshold, it can be automatically determined that the magnetic body in water is detected.

[0078] Please refer to Figure 4 、 Figure 5 , Figure 4 which is a schematic diagram of the three-axis magnetic sensor for the method of jointly detecting the leakage electric field signal and magnetic field signal of an electromagnetic body in water provided by the embodiment of the present application. Figure 5 which is a schematic diagram of the three-component electric field sensor array for the method of jointly detecting the leakage electric field signal and magnetic field signal of an electromagnetic body in water provided by the embodiment of the present application.

[0079] Install the three-axis magnetic sensor and the three-component electric field sensor array according to the same coordinate system; the three groups of coils of the three-axis magnetic sensor are respectively installed on the X, Y, and Z axes to measure the X, Y, and Z axis components of the magnetic field signal; the three-component electric field sensor array is composed of electrode 1, electrode 2, electrode 3, and electrode 4. Among them, electrode 1 is installed at the origin of the coordinate system. The potential difference measured between electrode 2 and electrode 1 is the component of the electric field signal in the Y-axis direction, the potential difference measured between electrode 3 and electrode 1 is the component of the electric field signal in the X-axis direction, and the potential difference measured between electrode 4 and electrode 1 is the component of the electric field signal in the Z-axis direction; the three-axis magnetic sensor and the three-component electric field sensor array are unified in the three directions of the X, Y, and Z axes of the space coordinate system.

[0080] The recognition of the signal in water is realized through the method of polarity correlation. Denote the correlation function as Re 123 . If the signal reaching the x-axis of the magnetic receiver is s(t1), the signal on the Y-axis is s(t2), and the signal on the Z-axis is s(t3), and n1(t), n2(t), n3(t) are the ambient noises received, then the three-axis received signal, that is, the alternating signal of the three-axis magnetic sensor, is:

[0081] X1(t) = s(t1) + n1(t),

[0082] Y1(t) = s(t2) + n2(t),

[0083] Z1(t) = s(t3) + n3(t),

[0084] If the signals reaching the x-axis of the electric field sensor array are r(t1), the signals on the Y-axis are r(t2), and the signals on the Z-axis are r(t3), which are the alternating signals of the three-component electric field sensor array, and n1(t), n2(t), and n3(t) are the received ambient noises;

[0085] Taking the Y-axis direction as an example, the detection function for the underwater magnet is:

[0086]

[0087] The cross-correlation coefficient between the magnetic field signal of the mine-sweeping tool and the electric field signal, and the cross-correlation coefficient between the magnetic field signal x(t) and the electric field signal y(t) is:

[0088]

[0089] Among them, R xy (τ) is the cross-correlation function between the magnetic field signal x(t) and the electric field signal y(t), and m x m y are the mean values of x(t) and y(t) respectively.

[0090] Please refer to Figure 6 、 Figure 7 , Figure 6 which is the relevant detection principle block diagram of the joint correlation detection method for the underwater electromagnetic body leakage electric field signal and magnetic field signal provided by the embodiment of the present application. Figure 7 This is the schematic diagram of the comparator circuit of the joint correlation detection method for the underwater electromagnetic body leakage electric field signal and magnetic field signal provided by the embodiment of the present application. The joint correlation detection method for the underwater electromagnetic body leakage electric field signal and magnetic field signal of the present invention uses the method of polarity correlation to reduce the calculation amount.

[0091] Specifically, the alternating signals of the three-axis magnetic field sensor pass through the comparator respectively. The comparison threshold value of the comparator is taken as the upper limit value of the marine magnetic environment noise. After passing through the comparator, it becomes a discrete polarity signal 0 or 1; the alternating signals of the three-component electric field sensor array pass through the comparator respectively. The comparison threshold value of the comparator is taken as the upper limit value of the marine electric field environment noise. After passing through the comparator, it becomes a discrete polarity signal 0 or 1, which is equivalent to 1-bit quantization correlation.

[0092] Specifically, the first input end of the comparator is used to input the alternating signal of the three-axis magnetic field sensor or the alternating signal of the three-component electric field sensor array; the second input end of the comparator is used to input the comparison threshold value; the output end of the comparator is used to output the discrete polarity signal.

[0093] Specifically, the positive power supply terminal of the comparator is connected to a +3V power supply and one end of a voltage-dividing resistor. The other end of the voltage-dividing resistor is connected to the sliding terminal of a sliding resistor. One end of the sliding resistor is connected to the second input terminal of the comparator, and the other end of the sliding resistor is connected to the negative power supply terminal of the comparator and grounded.

[0094] The comparator jointly makes the comparison threshold level be: Make the comparison threshold level V REF The same as the upper limit value of the environmental noise voltage.

[0095] Specifically, the alternating signals of the three-axis magnetic field sensor and the alternating signals of the three-component electric field sensor array pass through a 6-channel comparator circuit and become polarized discrete signals. The input magnetic field signal x(t) and the electric field signal x(t) are both zero-mean stationary Gaussian random processes. Polarization is equivalent to the signal passing through the sign function:

[0096]

[0097] Then the discretized polarization correlation function can be estimated as follows:

[0098]

[0099] Calculating the polarization correlation function only requires N(N + 1) / 2 times of polarization comparison and addition / subtraction 1 operations.

[0100] Using the logical comparison (coincidence operation) of low-power digital devices such as single-chip microcontrollers can replace the multiplication operation of linear correlation to reduce the amount of calculation.

[0101] Please refer to Figure 8 , Figure 8 which is the structural block diagram of the joint correlation detection device for the leaked electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application. The polarization module in the figure is a 6-channel comparator. After converting the alternating signals of the three-axis magnetic field sensor and the three-component electric field sensor array into discrete signals, they are input into the single-chip microcontroller. The single-chip microcontroller completes the polarization comparison and addition / subtraction 1 operations to obtain the correlation coefficient curve of the magnetic signal and the electric field signal.

[0102] Please refer to Figure 9 、 Figure 10 , Figure 9 which is the test result diagram of the correlation detection of the magnetic signal of the underwater magnet in the method for jointly detecting the leaked electric field signal and magnetic field signal of the underwater electromagnet provided by the embodiment of the present application. Figure 10This is the test result graph of the correlation detection of the electric field signal in the joint correlation detection method of the leakage electric field signal and the magnetic field signal of the underwater electromagnet provided by the embodiment of the present application. Taking the platform equipped with the magnetic and electric signal correlation detection device as the origin, the underwater magnet sails above the device. As the signal-to-noise ratio changes with the change of the relative distance, the closer the distance, the higher the signal-to-noise ratio, and the corresponding peak of the correlation changes. When the correlation coefficient reaches the preset threshold, it is automatically determined that the underwater magnet is detected. According to the test results, the correlation coefficient threshold is set to 2000 points. It can be seen from the figure that when the underwater magnet has not moved into the detection area, the correlation coefficient of the environmental noise is an extremely low bottom value, far lower than 2000 points; when the underwater magnet moves into the detection area, the correlation coefficients of the magnetic field signal and the electric field signal in the three-axis directions all increase to more than 2000 points, exceeding the threshold value, and at this time it is determined that the underwater magnet is detected.

[0103] The present invention also provides a joint correlation detection device for the leakage electric field signal and the magnetic field signal of the underwater electromagnet, including:

[0104] A processing module, which is used to realize the detection of the underwater magnet through joint signal processing by the correlation method;

[0105] A three-axis magnetic field sensor and a three-component electric field sensor array, which are used to obtain the alternating signals of the two sensors in the corresponding directions;

[0106] A comparator, which is used to compare the alternating signals of the two sensors through the comparator with the environmental noise level to obtain discrete polarity signals;

[0107] A sending module, which is used to send the discrete polarity signals to the single-chip microcomputer;

[0108] A single-chip microcomputer, which is used to multiply the two discrete polarity signals in the same direction to obtain the correlation coefficient. When the correlation coefficient reaches the preset threshold, it is determined that the underwater magnet is detected.

[0109] The present invention also provides an electronic device, which includes a processor and a memory. The memory stores program instructions, and the processor runs the program instructions to implement the above-mentioned combined correlation detection method for the leakage electric field signal and magnetic field signal of the electromagnetic body in water. The processor may be a general-purpose processor, including a central processing unit (CPU for short) and a network processor (NP for short), etc.; it may also be a digital signal processor (DSP for short), an application specific integrated circuit (ASIC for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components; the memory may include a random access memory (RAM for short), and may also include a non-volatile memory, such as at least one disk memory. The memory may also be an internal memory of the random access memory (RAM) type, and the processor and the memory may be integrated into one or more independent circuits or hardware, such as an application specific integrated circuit (ASIC). It should be noted that when the computer program in the above-mentioned memory is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, an electronic device, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention.

[0110] The present invention also provides a computer-readable storage medium, which stores computer instructions for causing the computer to execute the above-mentioned combined correlation detection method for the leakage electric field signal and magnetic field signal of the electromagnetic body in water. The computer-readable storage medium may be an electronic medium, a magnetic medium, an optical medium, an electromagnetic medium, an infrared medium, or a semiconductor system or a propagation medium. The computer-readable storage medium may also include a semiconductor or solid-state memory, a magnetic tape, a removable computer disk, a random access memory (RAM), a read-only memory (ROM), a hard disk, and an optical disk. The optical disk may include a compact disc read-only memory (CD-ROM), a compact disc read / write (CD-RW), and a digital versatile disc (DVD).

[0111] In summary, for the joint correlation detection method of the leakage electric field signal and the magnetic field signal of the electromagnetic body in water of the present invention, by using the electric field signal generated by the magnetic body excitation device in water and the method of joint correlation processing with the magnetic field signal, for the joint processing of different physical fields of two homologous signals, the detection accuracy can be improved at the level of physical principles.

[0112] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for detecting the combined correlation of the electric field signal and the magnetic field signal of an underwater electromagnet leakage, characterized in that: include: S1. Detection of magnets in water is achieved through correlation method combined with signal processing; S2, by installing a three-axis magnetic field sensor and a three-component electric field sensor array on the detection device, obtaining two sensor alternating signals in corresponding directions; S3, passing the two sensor alternating signals through a comparator and comparing them with the ambient noise level to obtain a discrete polarity signal; S4, sending the discrete polarity signal to the single chip microcomputer; S5. The single chip microcomputer multiplies the two discrete polarity signals in the same direction to obtain a correlation coefficient. When the correlation coefficient reaches a preset threshold, it is determined that a magnet in the water is detected.

2. The method for detecting the combined correlation of the electric field signal and the magnetic field signal of the underwater electromagnet leakage according to claim 1 is characterized in that: The detection of the magnet in water by combining the correlation method with the signal processing in step S1 includes: The electric field signal generated by the circuit that excites the magnetic field of the underwater magnet leaking in the water, the magnetic field signal generated by the underwater magnet itself, and the electric field signal leaked in the water by the circuit that excites the magnetic field are processed jointly through pairwise correlation and correlation method to calculate the correlation coefficient, so as to realize the detection of the underwater magnet.

3. The combined correlation detection method of the electric field signal and magnetic field signal of the underwater electromagnet leakage according to claim 2 is characterized in that: In step S2, by installing a three-axis magnetic field sensor and a three-component electric field sensor array on the detection device, two sensor alternating signals in corresponding directions are obtained, including: Install the three-axis magnetic field sensor and the three-component electric field sensor array according to the same coordinate system; The three sets of coils of the three-axis magnetic field sensor are respectively installed on the X, Y, and Z axes to measure the X, Y, and Z axis components of the magnetic field signal; The three-component electric field sensor array is composed of electrode 1, electrode 2, electrode 3, and electrode 4, wherein electrode 1 is installed at the origin of the coordinate system, the potential difference measured between electrode 2 and electrode 1 is the component of the electric field signal in the Y-axis direction, the potential difference measured between electrode 3 and electrode 1 is the component of the electric field signal in the X-axis direction, and the potential difference measured between electrode 4 and electrode 1 is the component of the electric field signal in the Z-axis direction; The three-axis magnetic field sensor and the three-component electric field sensor array are unified in the three directions of the spatial coordinate system X, Y, and Z axes; The polarity correlation method is used to identify the signal in water. The correlation function is Re 123 , if the signal reaching the x-axis of the magnetic receiver is s(t1), the signal of the y-axis is s(t2), the signal of the z-axis is s(t3), n1(t), n2(t), n3(t) are the received environmental noise, then the three-axis received signal is the alternating signal of the three-axis magnetic field sensor: X1(t)=s(t1)+n1(t), Y1(t)=s(t2)+n2(t), Z1(t)=s(t3)+n3(t), If the signal reaching the x-axis of the electric field sensor array is r(t1), the signal of the y-axis is r(t2), and the signal of the z-axis is r(t3), then it is a three-component electric field sensor array alternating signal, and n1(t), n2(t), and n3(t) are the received environmental noises; In the Y-axis direction, the detection function of the magnet in water is: The mutual correlation coefficient between the magnetic field signal and the electric field signal of the mine sweeper, the mutual correlation coefficient between the magnetic field signal x(t) and the electric field signal y(t) is: Among them, R xy (τ) is the cross-correlation function between the magnetic field signal x(t) and the electric field signal y(t), m x m y are the means of x(t) and y(t) respectively.

4. The method for detecting the combined correlation of the electric field signal and the magnetic field signal of the underwater electromagnet leakage according to claim 3 is characterized in that: In step S3, the two sensor alternating signals are compared with the ambient noise level through a comparator to obtain discrete polarity signals, including: The alternating signals of the three-axis magnetic field sensor are respectively passed through the comparator, and the comparison threshold value of the comparator is the upper limit value of the ocean magnetic environment noise. After passing through the comparator, it is converted into a discrete polarity signal of 0 or 1; The alternating signals of the three-component electric field sensor array pass through the comparator respectively. The comparison threshold value of the comparator takes the upper limit value of the ocean electric field environment noise. After passing through the comparator, it becomes a discrete polarity signal 0 or 1, which is equivalent to 1-bit quantized correlation.

5. The method for detecting the combined correlation of the electric field signal and the magnetic field signal of the underwater electromagnet leakage according to claim 4 is characterized in that: The first input end of the comparator is used to input the alternating signal of the three-axis magnetic field sensor or the alternating signal of the three-component electric field sensor array; the second input end of the comparator is used to input the comparison threshold value; and the output end of the comparator is used to output a discrete polarity signal.

6. The method for detecting the combined correlation of the electric field signal and the magnetic field signal of the underwater electromagnet leakage according to claim 5, characterized in that: The positive power supply terminal of the comparator is connected to the +3V power supply and one end of the voltage divider resistor, the other end of the voltage divider resistor is connected to the sliding end of the sliding resistor, one end of the sliding resistor is connected to the second input terminal of the comparator, and the other end of the sliding resistor is connected to the negative power supply terminal of the comparator and grounded.

7. A device for detecting the combined correlation of the electric field signal and magnetic field signal of an underwater electromagnet leakage, characterized in that: include: A processing module, used for detecting magnets in water by combining signal processing with correlation method; A three-axis magnetic field sensor and a three-component electric field sensor array are used to obtain two sensor alternating signals in corresponding directions; A comparator, used for comparing the two sensor alternating signals with the ambient noise level through the comparator to obtain a discrete polarity signal; A sending module, used for sending the discrete polarity signal to a single chip microcomputer; The single chip microcomputer is used to multiply two discrete polarity signals in the same direction to obtain a correlation coefficient. When the correlation coefficient reaches a preset threshold, it is determined that a magnet in the water is detected.

8. An electronic device, comprising a processor and a memory, wherein the memory stores program instructions, characterized in that: The processor runs program instructions to implement the joint correlation detection method of underwater electromagnet leakage electric field signal and magnetic field signal as described in any one of claims 1 to 6.

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