Double-shaft coupling error suppression method of nuclear magnetic resonance atomic gyroscope

Abstract

The invention provides a biaxial coupling error suppression method of a nuclear magnetic resonance atomic gyroscope, and belongs to the technical field of nuclear magnetic resonance atomic gyroscopes. A nuclear magnetic resonance atomic gyroscope inertial measurement system is started, and a magnetic field is applied to the system, so that the system works in a nuclear magnetic resonance state; applying a low-frequency modulation magnetic field with a certain amplitude on a y axis orthogonal to the x axis, and outputting a measured magnetic field amplitude of the x axis under the condition by using a magnetometer embedded in the nuclear magnetic resonance atomic gyroscope; a PID module of a phase-locked amplifier in a system demodulation signal system is used as an input quantity of PID control, a target value is set as 0, an output quantity is set as a carrier demodulation frequency, and the suppression of coupling errors is realized by adjusting the carrier demodulation frequency to be consistent with an atomic frequency; when the nuclear magnetic resonance atomic gyroscope works normally, the alkali metal spin frequency is locked, it is guaranteed that the carrier demodulation frequency is consistent with the alkali metal spin frequency, additional auxiliary and calibration equipment does not need to be added, and the method has important significance in the field of inertial measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear magnetic resonance atomic gyroscopes, in particular to a method for suppressing dual-axis coupling errors of nuclear magnetic resonance atomic gyroscopes. Background Art

[0002] With the rapid development of quantum technology and the continuous progress in atomic physics and related atomic manipulation technologies, sensors based on various atomic effects have also achieved unprecedented development.

[0003] At present, the nuclear magnetic resonance atomic gyroscope based on the nuclear magnetic resonance effect is a new type of atomic spin angular velocity sensor. Due to its technical advantage of being able to achieve small-volume and high-precision inertial measurement, it has been widely favored by researchers and has gradually moved from principle realization to its miniaturized integrated prototype. The nuclear magnetic resonance atomic gyroscope is expected to achieve a major breakthrough in atomic gyroscope technology and has very important economic value.

[0004] The nuclear magnetic resonance atomic gyroscope uses orthogonal pumping laser and detection laser, and arranges the external structure of the three-axis magnetic field coil separately. Alkali metal atoms are added to the gas chamber to construct an in-situ magnetometer to detect the spin magnetic moment of the inert gas; the spin magnetic moment signal is output by the alkali metal in-situ magnetometer, and the spin frequency of the inert gas is extracted to realize inertial measurement; in this process, a magnetic field signal with the same spin frequency as the alkali metal needs to be applied as the modulation signal, which can not only reduce the interference of low-frequency noise, but also amplify the measurement signal through parameter resonance.

[0005] Currently, nuclear magnetic resonance atomic gyroscopes primarily employ a method of determining the alkali metal spin frequency by sweeping the signal before measurement begins, thereby setting a fixed frequency for carrier application and subsequent demodulation. However, this existing design has the following drawbacks, such as:

[0006] ① This method is limited by the frequency sweep accuracy and lacks adjustment means for the situation where the frequency of alkali metals changes due to changes in the atomic state during the measurement process;

[0007] ② Moreover, when the alkali metal spin frequency in the nuclear magnetic resonance atomic gyroscope is inconsistent with the carrier demodulation frequency, a dual-axis coupling error will occur in the signal demodulation, and the original measurement signal will be mixed with the applied driving magnetic field signal, reducing the measurement accuracy of the nuclear magnetic resonance atomic gyroscope.

[0008] In summary, with the continuous development of nuclear magnetic resonance atomic gyroscope technology, it is very necessary to suppress the dual-axis coupling error of nuclear magnetic resonance atomic gyroscope caused by the change of alkali metal spin frequency, but there is currently a lack of practical research in this area. Summary of the Invention

[0009] In order to solve the above technical problems, the present invention provides a method for suppressing the dual-axis coupling error of a nuclear magnetic resonance atomic gyroscope. By applying a calibration signal to measure the precession of the dual-axis coupling term in real time, real-time control of the carrier demodulation frequency of the nuclear magnetic resonance gyroscope is achieved, ensuring that the carrier demodulation frequency and the alkali metal spin frequency remain consistent in real time, thereby eliminating the dual-axis coupling error, which is of great significance to improving the accuracy and stability of the nuclear magnetic resonance atomic gyroscope.

[0010] A method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope, comprising:

[0011] Step 1: Start the atomic magnetometer and apply a resonant magnetic field to operate in a nuclear magnetic resonance state; simultaneously, heat the atomic gas chamber of the nuclear magnetic resonance atomic gyroscope to an operating temperature, and use a circularly polarized laser to polarize the alkali metal atoms in the atomic gas chamber to a steady state. In the resonant magnetic field environment, the inert gas nuclear magnetic resonance is in a steady state.

[0012] Step 2: Apply a low-frequency sinusoidal modulated magnetic field B in the direction of the drive axis. cal cos(ω cal t), obtain the output of the in-situ magnetometer embedded in the atomic magnetometer at this time, corresponding to ω cal Low frequency component A cal ;

[0013] Step 3: Use the PID module in the magnetic field control system to adjust the carrier demodulation frequency to the low frequency component A cal The input quantity is set to 0, the target value is set to 0, the output quantity is set to the carrier demodulation frequency, and the carrier demodulation frequency is locked in real time;

[0014] Step 4: Determine the low-frequency component A cal Whether the locking condition meets the requirements, by adjusting the parameters of the PID module, the carrier demodulation frequency is adjusted to be consistent with the atomic frequency, so as to suppress the coupling error, obtain better control accuracy, and facilitate subsequent inertial measurement.

[0015] As an example, the atomic magnetometer adopts a nuclear magnetic resonance atomic gyro inertial measurement system, including: a pumping optical path and a detection optical path, wherein:

[0016] The pumping optical path includes: a first distributed feedback laser, a first half-wave plate, a first beam expander, a first beam amplitude modulator, a first half-wave plate, a first PBS, a first photodetector, a first electronic processing system, a quarter-wave plate and a first reflector connected in sequence;

[0017] The detection optical path includes: a second distributed feedback laser, a second half-wave plate, a second beam expander, a second beam amplitude modulator, a second half-wave plate, a second PBS, a second photodetector, a second electronic processing system connected in sequence, and a third half-wave plate, a third PBS, a second reflector and a balanced photodetector after the detection laser passes through the atomic gas chamber.

[0018] As an example, the first beam amplitude modulator, the first half-wave plate, the first PBS, the first photodetector and the first electronic processing system serve as a light intensity stabilization system.

[0019] As an example, applying a resonant magnetic field refers to applying an alternating magnetic field and compensating for a static magnetic field using a three-axis magnetic field coil outside the atomic gas chamber, specifically:

[0020] Applying a main magnetic field and a carrier magnetic field to the z-axis magnetic field coil;

[0021] Applying a compensation magnetic field of y-axis residual magnetism and an inert gas nuclear magnetic resonance driving magnetic field on the driving shaft y-axis;

[0022] A compensation magnetic field of x-axis residual magnetism is applied to the sensitive axis x-axis.

[0023] As an example, the periphery of the three-axis magnetic field coil adopts a multi-layer magnetic shielding barrel structure to reduce the interference of the earth's magnetic field.

[0024] As an example, the multi-layer magnetic shielding barrel structure is made of Permalloy material.

[0025] As an example, the x-axis serves as a sensitive axis, and the y-axis serves as a driving axis.

[0026] As an example, the atomic gas chamber is disposed inside the heating ceramic.

[0027] As an example, the heating ceramic is arranged inside the triaxial magnetic field coil.

[0028] It is possible to measure the dual-axis coupling in real time without changing the working state of the nuclear magnetic resonance atomic gyroscope, and to change the carrier demodulation frequency in real time according to the measured value to reduce the dual-axis coupling error, which has a strong application background.

[0029] The present invention can lock the alkali metal spin frequency when the nuclear magnetic resonance atomic gyroscope is operating normally, ensuring that the carrier demodulation frequency is consistent with the alkali metal spin frequency, thereby suppressing the dual-axis coupling error of the nuclear magnetic resonance atomic gyroscope without adding any additional auxiliary and calibration equipment. This is of great significance for improving the performance of the nuclear magnetic resonance atomic gyroscope and ensuring its practical application in the field of inertial measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of the process design of a dual-axis coupling error suppression method for a nuclear magnetic resonance atomic gyroscope according to the present invention.

[0031] Figure 2 The figure is a schematic diagram of the overall structure of a nuclear magnetic resonance atomic gyroscope device according to a method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope of the present invention.

[0032] Figure 3 The figure is a schematic diagram of the principle of nuclear magnetic resonance atomic gyroscope signal processing and magnetic field control system of a dual-axis coupling error suppression method of a nuclear magnetic resonance atomic gyroscope according to the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work shall fall within the scope of protection of the present application. Figures 1 to 3 As shown:

[0034] A method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope, comprising:

[0035] Step 1: Start the atomic magnetometer and apply a resonant magnetic field so that the atomic magnetometer operates in a nuclear magnetic resonance state; at the same time, heat the atomic gas chamber 26 of the nuclear magnetic resonance atomic gyroscope to the operating temperature, and use a circularly polarized laser to polarize the alkali metal atoms in the atomic gas chamber 26 to a steady state. In the resonant magnetic field environment, the inert gas nuclear magnetic resonance is in a steady state;

[0036] At this time, the magnetic field output by the three-axis magnetic coil is expressed as:

[0037]

[0038] Among them, B x0 、B y0 is the residual static magnetic field in the x-axis and y-axis directions; B dri cos(ω dri t) is the applied driving resonance magnetic field, B0 is the main magnetic field, B c cos(ω c t) is the carrier demodulation magnetic field.

[0039] The atomic spin dynamics in nuclear magnetic resonance atomic gyroscopes involves the interaction between magnetic fields, light and atoms. The density matrix can be used to fully and accurately describe the spin evolution process.

[0040] However, the calculation of density matrix is complicated and the physical image is not intuitive enough. The atoms in the nuclear magnetic resonance atomic gyroscope run in a high alkali metal density and weak magnetic field environment. Under such conditions, the classical Bloch equation can be used to describe the magnetic moment of alkali metal atoms. The spin evolution process of is described as follows:

[0041]

[0042] Among them, γ Alkali is the gyromagnetic ratio of Rb atoms, is the magnetic moment strength of the alkali metal atom in the i-axis direction, is the initial polarization intensity of the alkali metal atoms in the z-axis direction, is the magnetic field felt by the alkali metal atoms in the i-axis direction, τ1 and τ2 represent the longitudinal and transverse relaxation times of the alkali metal atoms, respectively. are the direction vectors of the x, y, and z axes respectively.

[0043] At this time, the magnetic field felt by the alkali metal atoms includes not only the magnetic field applied by the coil mentioned above, but also the resonant magnetic field K generated by the nuclear magnetic resonance effect of the inert gas. ⊥ cos(ω inert t), expressed as:

[0044]

[0045] The change in light intensity detected by optical rotation is proportional to the change in the transverse magnetic moment of the alkali metal In summary, we can get

[0046]

[0047] Among them J n is the nth-order Bessel function J n (γ Rb B c / ω c ), C is a constant term, p and q are positive integers;

[0048] In order to reduce low-frequency interference, only The high frequency part Expressed as:

[0049]

[0050] Ideally, the carrier demodulation frequency ω c and the alkali metal atom spin frequency ω alkali consistent and in opposite directions, there will be nω c +ω Alkali =0, but in the actual measurement process, due to the change of atomic state, the frequency of alkali metal ω AlkaliChange, resulting in nω c +ω Alkali ≠0, let And take the first harmonic signal (p=1), the signal expression is:

[0051]

[0052] By using the carrier demodulation frequency ω c The demodulated signal X is as follows

[0053]

[0054] Due to Δω Alkali The presence of X will cause X to couple into the driving magnetic field of the drive shaft in addition to the sensitive residual magnetism to be measured and the precession magnetic field of the inert gas. This introduces measurement noise into the inertial measurement process of the nuclear magnetic resonance atomic gyroscope. Moreover, since the frequency of the applied driving magnetic field is often very close to the frequency of the inert gas, it cannot be filtered out using a filter. To solve this problem, the present invention provides a dual-axis coupling error suppression method for a nuclear magnetic resonance atomic gyroscope by adding a low-frequency non-resonant calibration magnetic field B to the drive shaft. cal cos(ω cal t), its frequency should be kept away from the inert gas chamber spin frequency and the power frequency. At this time, the external magnetic field felt by the alkali metal atoms is

[0055]

[0056] Furthermore, the carrier demodulation frequency ω is used c The signal X obtained after signal demodulation is expressed as:

[0057]

[0058] Frequency of use ω cal By demodulating X, we can get the low-frequency non-resonant calibration magnetic field B in the sensitive axis direction at this time. cal cos(ω cal t) corresponds to the signal component A cal , A cal The size of Δω can be Rb There exists a measure of the biaxial coupling of atomic gyroscopes resulting in nuclear magnetic resonance.

[0059] A will be output in real time cal Import it into the PID control module of the magnetic field control system, use it as the input value, set the value to 0, and set the output value to the carrier demodulation frequency ω at this time. c As the controlled quantity, by cal Control is 0, to achieve ω c For ω RbReal-time following to suppress dual-axis coupling errors.

[0060] Step 2: Apply a low-frequency sinusoidal modulated magnetic field B in the direction of the drive axis. cal cos(ω cal t), obtain the output of the in-situ magnetometer embedded in the atomic magnetometer at this time, corresponding to ω cal Low frequency component A cal ;

[0061] Step 3: Use the PID module in the magnetic field control system to adjust the carrier demodulation frequency to the low frequency component A cal The input quantity is set to 0, the target value is set to 0, the output quantity is set to the carrier demodulation frequency, and the carrier demodulation frequency is locked in real time;

[0062] Step 4: Determine the low-frequency component A cal Whether the locking condition meets the requirements, by adjusting the parameters of the PID module, the carrier demodulation frequency is adjusted to be consistent with the atomic frequency, so as to suppress the coupling error, obtain better control accuracy, and facilitate subsequent inertial measurement.

[0063] As an example, the atomic magnetometer adopts a nuclear magnetic resonance atomic gyro inertial measurement system, including: a pumping optical path and a detection optical path, wherein:

[0064] The pumping optical path includes: a first distributed feedback laser 1, a first half-wave plate 2, a first beam expander 3, a first beam amplitude modulator 4, a first half-wave plate 5, a first PBS 6, a first photodetector 9, a first electronic processing system 10, a quarter-wave plate 7 and a first reflector 8 connected in sequence;

[0065] The detection optical path includes: a second distributed feedback laser 11, a second half-wave plate 12, a second beam expander 13, a second beam amplitude modulator 14, a second half-wave plate 15, a second PBS 16, a second photodetector 17, a second electronic processing system 18, and a third half-wave plate 19, a third PBS 20, a second reflector 21 and a balanced photodetector 22 connected in sequence after the detection laser passes through the atomic gas chamber 26.

[0066] As an example, the first beam amplitude modulator 4, the first half-wave plate 5, the first PBS 6, the first photodetector 9 and the first electronic processing system 10 serve as a light intensity stabilization system.

[0067] As an example, applying a resonant magnetic field refers to applying an alternating magnetic field and compensating for a static magnetic field using a three-axis magnetic field coil 24 outside the atomic gas chamber 26 , specifically:

[0068] Applying a main magnetic field and a carrier magnetic field to the z-axis magnetic field coil;

[0069] Applying a compensation magnetic field of y-axis residual magnetism and an inert gas nuclear magnetic resonance driving magnetic field on the driving shaft y-axis;

[0070] A compensation magnetic field of x-axis residual magnetism is applied to the sensitive axis x-axis.

[0071] As an example, the periphery of the three-axis magnetic field coil 24 adopts a multi-layer magnetic shielding barrel structure 23 to reduce the interference of the earth's magnetic field.

[0072] As an example, the multi-layer magnetic shielding barrel structure 23 is made of Permalloy material.

[0073] As an example, the x-axis serves as a sensitive axis, and the y-axis serves as a driving axis.

[0074] As an example, the atomic gas chamber 26 is disposed inside the heating ceramic 25 .

[0075] As an example, the heating ceramic 25 is disposed inside the triaxial magnetic field coil 24 .

[0076] The nuclear magnetic resonance atomic gyro inertial measurement system is started and a magnetic field is applied to the system to make it operate in a nuclear magnetic resonance state. A low-frequency modulated magnetic field of a certain amplitude is applied on the y-axis orthogonal to the x-axis, and the magnetometer embedded in the nuclear magnetic resonance atomic gyro is used to output the measured magnetic field amplitude of the x-axis under this condition. The PID module of the phase-locked amplifier in the system demodulation signal is used as the input of the PID control, the target value is set to 0, and the output is set to the carrier demodulation frequency. By adjusting the carrier demodulation frequency to be consistent with the atomic frequency, the coupling error is suppressed.

[0077] It should be noted that for the method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all optional embodiments, and the actions involved are not necessarily required by this application.

[0078] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0079] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0080] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

[0081] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the embodiments of this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0082] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0083] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0084] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0085] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0086] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0087] The above are only preferred embodiments of the present invention. It should be understood that the description of the above embodiments is only used to help understand the method and core ideas of the present invention, and is not used to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, etc. made within the ideas and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope, characterized in that: include: Step 1: Start the atomic magnetometer and apply a resonant magnetic field to operate in a nuclear magnetic resonance state; simultaneously, heat the atomic gas chamber of the nuclear magnetic resonance atomic gyroscope to an operating temperature, and use a circularly polarized laser to polarize the alkali metal atoms in the atomic gas chamber to a steady state. In the resonant magnetic field environment, the inert gas nuclear magnetic resonance is in a steady state. Step 2: Apply a low-frequency sinusoidal modulated magnetic field B in the direction of the drive axis. cal cos(ω cal t), obtain the output of the in-situ magnetometer embedded in the atomic magnetometer at this time, corresponding to ω cal Low frequency component A cal ; Step 3: Use the PID module in the magnetic field control system to adjust the carrier demodulation frequency to the low frequency component A cal The input quantity is set to 0, the target value is set to 0, the output quantity is set to the carrier demodulation frequency, and the carrier demodulation frequency is locked in real time; Step 4: Determine the low-frequency component A cal Whether the locking condition meets the requirements, by adjusting the parameters of the PID module, the carrier demodulation frequency is adjusted to be consistent with the atomic frequency, so as to suppress the coupling error, obtain better control accuracy, and facilitate subsequent inertial measurement.

2. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 1, characterized in that: The atomic magnetometer adopts a nuclear magnetic resonance atomic gyro inertial measurement system, including: a pumping optical path and a detection optical path, wherein: The pumping optical path includes: a first distributed feedback laser, a first half-wave plate, a first beam expander, a first beam amplitude modulator, a first half-wave plate, a first PBS, a first photodetector, a first electronic processing system, a quarter-wave plate and a first reflector connected in sequence; The detection optical path includes: a second distributed feedback laser, a second half-wave plate, a second beam expander, a second beam amplitude modulator, a second half-wave plate, a second PBS, a second photodetector, a second electronic processing system connected in sequence, and a third half-wave plate, a third PBS, a second reflector and a balanced photodetector after the detection laser passes through the atomic gas chamber.

3. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 2, characterized in that: The first beam amplitude modulator, the first half-wave plate, the first PBS, the first photodetector and the first electronic processing system serve as a light intensity stabilization system.

4. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 1, characterized in that: The application of the resonant magnetic field refers to: using the three-axis magnetic field coil outside the atomic gas chamber to apply the alternating magnetic field and compensate the static magnetic field, specifically: Applying a main magnetic field and a carrier magnetic field to the z-axis magnetic field coil; Applying a compensation magnetic field of y-axis residual magnetism and an inert gas nuclear magnetic resonance driving magnetic field on the driving shaft y-axis; A compensation magnetic field of x-axis residual magnetism is applied to the sensitive axis x-axis.

5. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 4, characterized in that: The periphery of the triaxial magnetic field coil adopts a multi-layer magnetic shielding barrel structure to reduce the interference of the earth's magnetic field.

6. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 5, characterized in that: The multi-layer magnetic shielding barrel structure is made of Permalloy material.

7. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 4, characterized in that: The x-axis serves as a sensitive axis, and the y-axis serves as a driving axis.

8. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 1, characterized in that: The atomic gas chamber is arranged inside the heating ceramic.

9. The method for suppressing dual-axis coupling errors of a nuclear magnetic resonance atomic gyroscope according to claim 8, characterized in that: The heating ceramic is arranged inside the triaxial magnetic field coil.

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