A method and system for improving the starting angular velocity of a high-precision fiber optic gyroscope

Abstract

The present invention belongs to the technical field of fiber optic gyroscopes, and specifically discloses a method and system for improving the starting angular velocity of a high-precision fiber optic gyroscope, the method comprising: constructing two working states of the fiber optic gyroscope, and phase modulation, demodulation and feedback in the two working states; solving the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state one, and then judging the working fringe level of the gyroscope in the working state two; according to the working fringe level of the fiber optic gyroscope in the working state two, correcting the closed-loop feedback control quantity and the angular velocity of the fiber optic gyroscope at the second maximum speed of the working state, and completing the improvement of the starting angular velocity of the high-precision fiber optic gyroscope. The present invention integrates two methods for improving the angular velocity of the fiber optic gyroscope, solves the problem that the existing extended dynamic range method cannot provide correct control parameters and angular velocity output when starting outside the super-optical range, and improves the angular velocity and starting angular velocity of the gyroscope without losing the accuracy of the fiber optic gyroscope.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber optic gyroscopes, and in particular relates to a method and a system for improving the starting angular velocity of a high-precision fiber optic gyroscope. Background Art

[0002] Fiber optic gyroscopes are currently used as conventional devices in the inertial field. They have been widely used in many fields due to their simple structure, long life, and high stability. The angular velocity of a fiber optic gyroscope is inversely proportional to the size of the fiber ring, that is, the larger the diameter and the longer the length of the fiber ring, the smaller the maximum angular velocity (i.e., dynamic range) it is sensitive to. However, in the development of high-precision gyroscopes, the accuracy is mainly improved by expanding the size and length of the fiber ring. Therefore, it is necessary to study methods to extend the dynamic range of high-precision gyroscopes.

[0003] At present, there are two main methods for extending the dynamic range of fiber optic gyroscopes: one is the cross-interference fringe modulation method, and the other is the single-stage interference fringe range extension method. Among them, the cross-interference fringe modulation method increases the closed-loop feedback full-scale range of the fiber optic gyroscope from the original 2 to 300 by working across the fringe. Expand to 2 However, this method requires accurate knowledge of the level of fringes that the fiber optic gyroscope is working at in order to obtain the correct demodulation result. There are usually two methods to determine the level of fringes that the fiber optic gyroscope is working at: one is to use the light intensity changes of each level of interference fringes to determine the fringing level. This method requires the construction of additional optical paths and circuits to detect light intensity changes, and the accuracy of the judgment needs to be further improved; the second is to use dual fiber ring assisted measurement or MEMS gyro assisted measurement to analyze the fringing level at which the fiber optic gyroscope is working by adding additional large-range angular velocity sensitive units. This solution is relatively complex and difficult to detect.

[0004] The range extension method of single-stage interference fringes uses the multi-valued nature of the Sagnac phase difference and the correlation between the number of DA control bits and the scale factor to expand the range of the fiber optic gyroscope by increasing the number of bits in the angular velocity register. This method is easy to use and does not require the addition of additional optical paths, circuits, etc. It can be implemented by simply modifying the demodulation control software based on the existing solution. However, this solution has certain limitations in use. First, the initial working state of the fiber optic gyroscope must be within the first-order fringes, that is, the gyroscope needs to be started at the angular velocity before the dynamic range is expanded; second, during use, the angular acceleration cannot cause it to jump to other interference fringes.

[0005] In summary, the current methods for improving the dynamic range of high-precision fiber optic gyroscopes have certain limitations in use. The cross-interference fringe modulation method cannot complete the addition of additional optical paths and circuits in a volume-constrained environment. The single-stage interference fringe range extension method has certain restrictions on the starting angular velocity and angular acceleration. When starting at a speed outside the optical range, its output angular velocity is abnormal and cannot increase the starting angular velocity. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the existing extended dynamic range method cannot provide correct control parameters and angular velocity output when starting outside the super-optical range, and proposes a method and system for improving the starting angular velocity of a high-precision fiber optic gyroscope.

[0007] The technical solution of the present invention is as follows: In a first aspect, a method for improving the starting angular velocity of a high-precision fiber optic gyroscope comprises the following steps:

[0008] S1. Construct two working states of the fiber optic gyroscope, namely working state 1 and working state 2, and construct phase modulation and demodulation and closed-loop feedback control of the fiber optic gyroscope in the two working states; in working state 1, the fiber optic gyroscope works by odd-number frequency modulation method; in working state 2, the fiber optic gyroscope works by single-stage interference fringe range extension method;

[0009] S2. Calculate the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state 1, and determine the working fringe level of the fiber optic gyroscope in the working state 2 according to the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state 1;

[0010] S3. According to the working fringe level of the fiber optic gyroscope in the second working state, the closed-loop feedback control quantity and the angular velocity of the fiber optic gyroscope at the second maximum rotation speed of the working state are corrected to improve the starting angular velocity of the high-precision fiber optic gyroscope.

[0011] The beneficial effects of the present invention are:

[0012] The present invention combines the range extension method of single-stage interference fringes with the odd-number frequency multiplication modulation method, and uses the odd-number frequency multiplication modulation method to distinguish the control and output abnormality problems caused by the super-optical range in the range extension method of single-stage interference fringes, thereby avoiding the defects of using a single method.

[0013] Preferably, the fiber optic gyroscope is developed based on the Sagnac effect, and the relationship between the Sagnac phase difference and the angular velocity of the fiber optic gyroscope is:

[0014]

[0015] in, represents the Sagnac phase difference, Indicates the length of the optical fiber. Indicates the diameter of the fiber ring, is the wavelength of light in vacuum, represents pi, is the speed of light in vacuum, represents the angular velocity of the fiber optic gyroscope.

[0016] Preferably, the step S1 specifically includes the following sub-steps:

[0017] S11. Constructing a fiber optic gyroscope to construct two working states of the fiber optic gyroscope, namely, working state one and working state two;

[0018] S12. According to the specific range requirements of the fiber optic gyroscope, the frequency doubling parameters of the fiber optic gyroscope working state 1 are set to obtain the modulation frequency after frequency doubling, and the closed-loop feedback control and the fiber optic gyroscope angular velocity output are performed according to the modulation frequency after frequency doubling, and the phase modulation and demodulation of the working state and the fiber optic gyroscope closed-loop feedback control are constructed;

[0019] S13. According to the range requirements of the fiber optic gyroscope, the ratio of the number of bits taken out of the angular velocity register and the number of bits of the step wave generator in the second working state of the fiber optic gyroscope is set, and the closed-loop feedback control and the angular velocity output of the fiber optic gyroscope are performed according to the ratio of the number of bits taken out of the angular velocity register and the number of bits of the step wave generator, and the phase modulation and demodulation under the working state II and the closed-loop feedback control of the fiber optic gyroscope are completed;

[0020] S14. It is preset that within s seconds before powering on, the fiber optic gyroscope works in working state one, and after s seconds, the fiber optic gyroscope works in working state two, and monitors the frequency value of the demodulation frequency to determine that the mode switching is successful.

[0021] As a preference, the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state 1 in step S2 is The calculation formula is:

[0022]

[0023] in, Fiber optic gyro angular velocity, Represents the scale factor.

[0024] Preferably, the step S2 of determining the working fringe level of the fiber optic gyroscope in working state 2 is specifically as follows:

[0025] when , in working state 2, the fiber optic gyroscope is in the first-order stripes; Indicates the maximum closed-loop feedback signal digital value;

[0026] when ,In working state 2, the fiber optic gyroscope is in the second-order stripe;

[0027] when , in working state 2, the fiber optic gyroscope is in the Level stripes;

[0028] when , in working state 2, the fiber optic gyroscope is in the Level stripes.

[0029] Preferably, the step S3 is specifically as follows:

[0030] S31. According to the positive and negative closed-loop feedback signal of the working state, the control direction of the fiber optic gyroscope after crossing the stripes and the positive and negative output of the fiber optic gyroscope angular velocity are determined;

[0031] S32. After determining the number of fringe levels, the control direction, and the positive or negative sign of the FOG angular velocity, the closed-loop feedback control quantity and the FOG angular velocity of the FOG in the second working state are corrected to obtain the correct closed-loop feedback control quantity and the FOG angular velocity output.

[0032] As a preferred embodiment, the step S31 is specifically as follows: after the cross-stripes, the control direction of the fiber optic gyroscope when working in the working state 2 is consistent with the control direction of the working state 1 at the same speed, and when the closed-loop feedback signal digital quantity is positive, and in working state 2, the angular velocity of the fiber optic gyroscope is negative; after crossing the stripes, the control direction of the fiber optic gyroscope in working state 2 is consistent with the control direction of working state 1 at the same speed, and when the closed-loop feedback signal digital quantity is negative, and in the second working state, the angular velocity of the fiber optic gyroscope is positive.

[0033] Preferably, the angular velocity of the modified fiber optic gyroscope in the second working state is specifically:

[0034] When the fiber optic gyroscope is in the mth order fringe, the angular velocity of the fiber optic gyroscope for:

[0035]

[0036] in, represents the angular velocity of the fiber optic gyro before correction, represents the maximum FOG angular velocity within the first-order fringes, The positive and negative signs of are consistent with the positive and negative signs of the fiber optic gyro angular velocity determined in step S31.

[0037] The beneficial effects of the above preferred solution are:

[0038] 1. By solving the closed-loop feedback signal of the fiber optic gyroscope in working state 1 and judging the working fringe level of the fiber optic gyroscope in working state 2, it is possible to effectively solve the control and output abnormality problems caused by exceeding the optical range in the range extension method of using odd frequency modulation method to distinguish single-stage interference fringes.

[0039] 2. By combining two different working states, the odd frequency modulation method is used to determine the number of fringes working under large dynamic startup of the single-stage interference fringe range extension method, which can make up for the single-stage interference fringe range extension method and provide correct control parameters and angular velocity output when started outside the optical range.

[0040] In a second aspect, a system for improving the starting angular velocity of a high-precision fiber optic gyroscope includes a processor, wherein the processor is used to execute the method for improving the starting angular velocity of a high-precision fiber optic gyroscope as described in the first aspect.

[0041] In a third aspect, a computer-readable storage medium is provided, wherein the storage medium stores computer instructions. In response to a computer reading the computer instructions in the storage medium, the computer executes the method for improving the starting angular velocity of a high-precision fiber optic gyroscope as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Shown is a flow chart of a method for improving the starting angular velocity of a high-precision fiber optic gyroscope. DETAILED DESCRIPTION

[0043] Now, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the embodiments shown and described in the accompanying drawings are only exemplary and are intended to explain the principles and spirit of the present invention, rather than to limit the scope of the present invention.

[0044] Embodiment 1:

[0045] like Figure 1 As shown, a method for improving the starting angular velocity of a high-precision fiber optic gyroscope comprises the following steps:

[0046] S1. Construct two working states of the fiber optic gyroscope, namely working state 1 and working state 2, and construct phase modulation and demodulation and closed-loop feedback control of the fiber optic gyroscope in the two working states; in working state 1, the fiber optic gyroscope works by odd-number frequency modulation method; in working state 2, the fiber optic gyroscope works by single-stage interference fringe range extension method;

[0047] S2. Calculate the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state 1, and determine the working fringe level of the fiber optic gyroscope in the working state 2 according to the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state 1;

[0048] S3. According to the working fringe level of the fiber optic gyroscope in the second working state, the closed-loop feedback control quantity and the angular velocity of the fiber optic gyroscope at the second maximum rotation speed of the working state are corrected to improve the starting angular velocity of the high-precision fiber optic gyroscope.

[0049] In this embodiment, the fiber optic gyroscope is developed based on the Sagnac effect, and the relationship between the Sagnac phase difference and the angular velocity of the fiber optic gyroscope is:

[0050]

[0051] in, represents the Sagnac phase difference, Indicates the length of the optical fiber. Indicates the diameter of the fiber ring, is the wavelength of light in vacuum, represents pi, is the speed of light in vacuum, represents the angular velocity of the fiber optic gyroscope.

[0052] In this embodiment, the phase demodulation principle of the odd frequency modulation method is:

[0053] If the Sagnac phase shift signal is , the closed-loop feedback signal is , then the output signal of the fiber optic gyro detector is for:

[0054]

[0055] in, represents the DC component, represents the cosine function;

[0056] If the amplitude of the modulated square wave is ,frequency ,in, represents pi, represents the transmission time of light through the entire length of the optical fiber coil, then the modulated signal for:

[0057]

[0058] in, represents the sine function; let , then the modulation signal is a superimposed DC component The amplitude on , the frequency is Square wave signal, modulation signal The Fourier series of for:

[0059]

[0060] in, represents an integer, Indicates time;

[0061] The DC component is blocked by a DC blocking circuit. Filter out, leaving only the square wave signal, according to the modulation signal The Fourier series of It can be seen that the modulation signal Contains only odd harmonic signals, and The amplitude of the subharmonic is 1 / 100 of the fundamental wave. ;

[0062] Using odd frequency multiplication method, such as Frequency doubling, that is, the frequency becomes , then the amplitude of the harmonic is , the dynamic range of the fiber optic gyroscope depends on the size of the closed-loop feedback signal. The relationship between the angular velocity of the fiber optic gyroscope and the digital value of the closed-loop feedback signal is:

[0063]

[0064] in, represents the angular velocity of the fiber gyro, Indicates the digital value of the closed-loop feedback signal. represents the scale factor;

[0065] After using odd frequency multiplication, the feedback digital quantity required at the same speed becomes the original , that is, the maximum angular velocity of the output is the original enlarged times.

[0066] In this embodiment, the phase demodulation principle of the single-stage interference fringe range extension method is:

[0067] The relationship between the closed-loop feedback signal phase of the FOG and the Sagnac phase difference caused by the angular velocity of the FOG is as follows:

[0068]

[0069] in, Indicates the closed-loop feedback signal phase, represents the Sagnac phase difference, Indicates the length of the optical fiber. Indicates the diameter of the fiber ring, is the wavelength of light in vacuum, represents pi, is the speed of light in vacuum, represents the angular velocity of the fiber optic gyroscope;

[0070] Closed loop feedback signal phase The closed-loop feedback signal is digital Generated by DA converter, amplifier and Y waveguide, the following relationship exists:

[0071]

[0072] in, is the Y-waveguide modulation coefficient, is the Y-waveguide half-wave voltage, is the conversion factor of the DA converter, is the number of bits of the DA converter, is the modulation voltage corresponding to the full scale of the DA converter;

[0073] When the closed-loop feedback signal is digital When the DA converter is full scale, the closed-loop feedback signal phase for rad, there are:

[0074]

[0075] Will and Substitution , and obtain the scaling factor for:

[0076] ;

[0077] The number of bits of the closed-loop feedback signal digital quantity output by the fiber optic gyroscope taken from the angular velocity register is different from that of the step wave generator. If the least significant bit of the closed-loop feedback signal digital quantity output by the fiber optic gyroscope is M bits lower than the least significant bit of the DA converter, the scale factor yes of 2 M times, that is:

[0078]

[0079] From the above formula, we can see that the scale factor decreases by 2 n times, the angular velocity of the fiber optic gyroscope represented by the digital quantity of the closed-loop feedback signal of this digit increases by 2 n times;

[0080] When the angular velocity of the fiber optic gyroscope When:

[0081]

[0082] in, represents the maximum FOG angular velocity within the first-order fringes, Indicates the Sagnac phase difference within the first-order fringes; ensuring that the fiber optic gyroscope works within the first-order fringes means ensuring:

[0083] ;

[0084] Then the Sagnac phase difference greater than the single-stage range is obtained:

[0085] .

[0086] In this embodiment, step S1 specifically includes the following sub-steps:

[0087] S11. Constructing a fiber optic gyroscope to construct two working states of the fiber optic gyroscope, namely, working state one and working state two;

[0088] S12. According to the specific range requirements of the fiber optic gyroscope, the frequency doubling parameters of the fiber optic gyroscope working state 1 are set to obtain the modulation frequency after frequency doubling, and the closed-loop feedback control and the fiber optic gyroscope angular velocity output are performed according to the modulation frequency after frequency doubling, and the phase modulation and demodulation of the working state and the fiber optic gyroscope closed-loop feedback control are constructed;

[0089] S13. According to the range requirements of the fiber optic gyroscope, the ratio of the number of bits taken out of the angular velocity register and the number of bits of the step wave generator in the second working state of the fiber optic gyroscope is set, and the closed-loop feedback control and the angular velocity output of the fiber optic gyroscope are performed according to the ratio of the number of bits taken out of the angular velocity register and the number of bits of the step wave generator, and the phase modulation and demodulation under the working state II and the closed-loop feedback control of the fiber optic gyroscope are completed;

[0090] S14. It is preset that within s seconds before powering on, the fiber optic gyroscope works in working state one, and after s seconds, the fiber optic gyroscope works in working state two, and monitors the frequency value of the demodulation frequency to determine that the mode switching is successful.

[0091] In this embodiment, the closed-loop feedback signal digital quantity of the fiber optic gyroscope in the working state 1 in step S2 is The calculation formula is:

[0092]

[0093] in, Fiber optic gyro angular velocity, represents the scale factor;

[0094] The determination of the working fringe level of the fiber optic gyroscope in working state 2 is specifically as follows:

[0095] when , in working state 2, the fiber optic gyroscope is in the first-order stripes; Indicates the maximum closed-loop feedback signal digital value;

[0096] when ,In working state 2, the fiber optic gyroscope is in the second-order stripe;

[0097] when , in working state 2, the fiber optic gyroscope is in the Level stripes;

[0098] when , in working state 2, the fiber optic gyroscope is in the Level stripes.

[0099] In this embodiment, step S3 is specifically as follows:

[0100] S31. According to the positive and negative closed-loop feedback signal of working state 1, the control direction of the fiber optic gyroscope after crossing the stripes and the positive and negative output of the fiber optic gyroscope angular velocity are determined, specifically:

[0101] After crossing the stripes, the control direction of the fiber optic gyroscope in the working state 2 is consistent with the control direction of the working state 1 at the same speed, and when the closed-loop feedback signal digital quantity is positive, and in working state 2, the angular velocity of the fiber optic gyroscope is negative; after crossing the stripes, the control direction of the fiber optic gyroscope in working state 2 is consistent with the control direction of working state 1 at the same speed, and when the closed-loop feedback signal digital quantity is negative, in working state 2, the angular velocity of the fiber optic gyroscope is positive;

[0102] S32. After determining the number of fringe levels, the control direction, and the positive or negative sign of the FOG angular velocity, the closed-loop feedback control quantity and the FOG angular velocity of the FOG in the second working state are corrected to obtain the correct closed-loop feedback control quantity and the FOG angular velocity output.

[0103] In this embodiment, the angular velocity of the modified fiber optic gyroscope in the second working state is specifically:

[0104] When the fiber optic gyroscope is in the mth order fringe, the angular velocity of the fiber optic gyroscope for:

[0105]

[0106] in, represents the angular velocity of the fiber optic gyro before correction, represents the maximum FOG angular velocity within the first-order fringes, The positive and negative signs of are consistent with the positive and negative signs of the fiber optic gyro angular velocity determined in step S31.

[0107] The present invention improves the single-stage interference fringe range expansion method, superimposes the odd-number frequency multiplication modulation method, and performs time-division and state-division control. The interference fringe level, feedback control amount and direction, and angular velocity output value and direction after crossing the optical range are accurately determined by the odd-number frequency multiplication modulation method, so that the high-precision fiber optic gyroscope is no longer limited by the optical range, and the angular velocity and starting angular velocity of the gyroscope are increased without losing the accuracy of the fiber optic gyroscope. The method for increasing the starting angular velocity of the high-precision gyroscope proposed by the present invention is simple to implement, does not require changing the hardware part, and can be implemented by simply adding software code.

[0108] Embodiment 2:

[0109] On the basis of Example 1, the embodiment of the present invention provides a system for improving the starting angular velocity of a high-precision fiber optic gyroscope, which is used to implement the method for improving the starting angular velocity of a high-precision fiber optic gyroscope as described in Example 1.

[0110] In this embodiment, the system may be an electronic device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor executes the program to implement part or all of the steps of the method for improving the starting angular velocity of a high-precision fiber optic gyroscope as described in Example 1.

[0111] In this embodiment, the electronic device may include: a processor, a memory, a bus and a communication interface. The processor, the communication interface and the memory are connected via a bus. The memory stores a computer program that can be run on the processor. When the processor runs the computer program, it executes part or all of the steps of the method for improving the starting angular velocity of a high-precision fiber optic gyroscope provided in the aforementioned embodiment 1 of the present application.

[0112] The system in the embodiment of the present invention may also be a computer-readable storage medium, which stores a computer program. When the computer program is executed, some or all steps of the method for improving the starting angular velocity of a high-precision fiber optic gyroscope as described in Example 1 are implemented.

[0113] The program code for implementing the method of the present invention can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code can be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0114] In the context of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0115] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0116] The systems and techniques described herein may be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0117] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship of client and server is generated by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, a server of a distributed system, or a server combined with a blockchain.

[0118] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for improving the starting angular velocity of a high-precision fiber optic gyroscope, characterized in that: The following steps are involved: S1. Construct two working states of the fiber optic gyroscope, namely working state 1 and working state 2, and construct phase modulation and demodulation and closed-loop feedback control of the fiber optic gyroscope in the two working states; in working state 1, the fiber optic gyroscope works by odd-number frequency modulation method; in working state 2, the fiber optic gyroscope works by single-stage interference fringe range extension method; S2. Calculate the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state 1, and determine the fringe level of the fiber optic gyroscope in the working state 2 according to the digital quantity of the closed-loop feedback signal of the fiber optic gyroscope in the working state 1; The closed-loop feedback signal digital quantity of the fiber optic gyroscope in the working state The calculation formula is: in, Fiber optic gyro angular velocity, represents the scale factor; The determination of the working fringe level of the fiber optic gyroscope in working state 2 is specifically as follows: when , in working state 2, the fiber optic gyroscope is in the first-order stripes; Indicates the maximum closed-loop feedback signal digital value; when ,In working state 2, the fiber optic gyroscope is in the second-order stripe; when , in working state 2, the fiber optic gyroscope is in the Level stripes; when , in working state 2, the fiber optic gyroscope is in the Level stripes; S3. According to the working fringes level of the fiber optic gyroscope in the working state II, the closed-loop feedback control amount and the angular velocity of the fiber optic gyroscope under the working state II are corrected to improve the starting angular velocity of the high-precision fiber optic gyroscope; specifically comprising the following steps: S31. According to the positive and negative closed-loop feedback signal of the working state, the control direction of the fiber optic gyroscope after crossing the stripes and the positive and negative output of the fiber optic gyroscope angular velocity are determined, specifically: After crossing the stripes, the control direction of the fiber optic gyroscope in the working state 2 is consistent with the control direction in the working state 1 at the same speed, and when the closed-loop feedback signal digital quantity is positive, and in working state 2, the angular velocity of the fiber optic gyroscope is negative; after crossing the stripes, the control direction of the fiber optic gyroscope in working state 2 is consistent with the control direction of working state 1 at the same speed, and when the closed-loop feedback signal digital quantity is negative, in working state 2, the angular velocity of the fiber optic gyroscope is positive; S32. After determining the number of fringes, the control direction and the positive and negative angular velocity of the fiber optic gyroscope, the closed-loop feedback control amount and the angular velocity of the fiber optic gyroscope in the second working state are corrected to obtain the correct closed-loop feedback control amount and the angular velocity output of the fiber optic gyroscope; The angular velocity of the fiber optic gyroscope in the second working state of the corrected fiber optic gyroscope is specifically: When the fiber optic gyroscope is in the mth order fringe, the angular velocity of the fiber optic gyroscope for: in, represents the angular velocity of the fiber optic gyro before correction, represents the maximum FOG angular velocity within the first-order fringes, The positive and negative signs of are consistent with the positive and negative signs of the fiber optic gyro angular velocity determined in step S31.

2. The method for improving the starting angular velocity of a high-precision fiber optic gyroscope according to claim 1, characterized in that: The fiber optic gyroscope is developed based on the Sagnac effect. The relationship between the Sagnac phase difference and the angular velocity of the fiber optic gyroscope is: in, represents the Sagnac phase difference, Indicates the length of the optical fiber. Indicates the diameter of the fiber ring, is the wavelength of light in vacuum, represents pi, is the speed of light in vacuum, represents the angular velocity of the fiber optic gyroscope.

3. The method for improving the starting angular velocity of a high-precision fiber optic gyroscope according to claim 1, characterized in that: The step S1 specifically includes the following sub-steps: S11. Constructing a fiber optic gyroscope to construct two working states of the fiber optic gyroscope, namely, working state one and working state two; S12. According to the specific range requirements of the fiber optic gyroscope, the frequency doubling parameters of the fiber optic gyroscope working state 1 are set to obtain the modulation frequency after frequency doubling, and the closed-loop feedback control and the fiber optic gyroscope angular velocity output are performed according to the modulation frequency after frequency doubling, and the phase modulation and demodulation of the working state and the fiber optic gyroscope closed-loop feedback control are constructed; S13. According to the range requirements of the fiber optic gyroscope, the ratio of the number of bits taken out of the angular velocity register and the number of bits of the step wave generator in the second working state of the fiber optic gyroscope is set, and the closed-loop feedback control and the angular velocity output of the fiber optic gyroscope are performed according to the ratio of the number of bits taken out of the angular velocity register and the number of bits of the step wave generator, and the phase modulation and demodulation under the working state II and the closed-loop feedback control of the fiber optic gyroscope are completed; S14. It is preset that within s seconds before powering on, the fiber optic gyroscope works in working state one, and after s seconds, the fiber optic gyroscope works in working state two, and monitors the frequency value of the demodulation frequency to determine that the mode switching is successful.

4. A system for improving the starting angular velocity of a high-precision fiber optic gyroscope, characterized in that: The method comprises a processor, wherein the processor is used to execute the method for improving the starting angular velocity of a high-precision fiber optic gyroscope according to any one of claims 1 to 3.

5. A computer-readable storage medium, characterized in that: The storage medium stores computer instructions. In response to the computer reading the computer instructions in the storage medium, the computer executes the method for improving the starting angular velocity of a high-precision fiber optic gyroscope as described in any one of claims 1 to 3.

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