Method and system for synchronously measuring multiple parameters of fiber-optic gyroscope

Abstract

The invention discloses a fiber-optic gyroscope multi-parameter synchronous measurement method, which is applied to a fiber-optic gyroscope multi-parameter synchronous measurement system, the system comprises an optical path module, a photoelectric detector module and an optical signal modulation and processing module, and the method comprises the following steps: obtaining a modulation signal through the optical signal modulation and processing module; acquiring a plurality of groups of interference light intensity signals through the light path module based on the modulation signal; acquiring a corresponding sampling signal through the photoelectric detector module based on the light intensity signal; and acquiring a detection channel parameter, a feedback channel parameter and a residual phase through the optical signal modulation and processing module based on the sampling signal.

Description

Technical Field

[0001] The present invention belongs to the signal processing method in fiber optic gyroscopes, and particularly relates to a method and system for synchronous measurement of multiple parameters in fiber optic gyroscopes. Background Art

[0002] A fiber optic gyroscope is a high-precision measurement interferometer that measures the phase difference generated by light during rotation by utilizing the Sagnac effect to calculate the rotational angular velocity. Fiber optic gyroscopes have the advantages of no mechanical moving parts, high sensitivity, long lifespan, etc., and have been widely applied in the fields of aerospace, aviation, navigation, etc.

[0003] Fiber optic gyroscopes usually operate in a square wave plus staircase wave modulation mode, achieving the measurement of independent physical quantities such as half-wave voltage, light intensity, etc. Parameters of the detection channel and feedback channel, which are key parameters for calculating the angular velocity, are preset parameters. A fiber optic gyroscope is a complex highly integrated system containing various optical and electronic devices, and is easily affected by the application environment. For example, vibrations, magnetic fields, radiation, device aging, etc. in the application environment will all introduce errors in the measurement of the angular velocity. Currently, since the parameters of the detection channel and feedback channel are preset and cannot be adaptively adjusted dynamically, it will inevitably affect the accuracy of the angular velocity measurement. Summary of the Invention

[0004] The present invention proposes a method and system for synchronous measurement of multiple parameters in fiber optic gyroscopes. By adding a phase modulation signal through an optical signal modulation and processing module, each phase modulation signal consists of five modulation steps, and the duration of each modulation step is the transit time of the fiber optic loop in the fiber optic gyroscope; for each modulation step, corresponding digital signals are sampled through a photodetector module, and based on the digital signals, the parameters of the detection channel, feedback channel, and residual phase of the current modulation period of the fiber optic gyroscope are obtained through calculation. This method and device have high measurement reliability, do not require modification of the hardware of the fiber optic gyroscope, are compatible with the conventional modulation and demodulation process, and can realize real-time and synchronous measurement of the parameters of the detection channel, feedback channel, and residual phase in the fiber optic gyroscope within a single modulation period. This method can be used for precise real-time control of the operating parameters of the fiber optic gyroscope, and at the same time, real-time monitoring of the signal channel parameters of the fiber optic gyroscope under complex environmental conditions is carried out to realize the dynamic performance evaluation of the fiber optic gyroscope.

[0005] The first aspect of the present invention provides a method for synchronous measurement of multiple parameters in fiber optic gyroscopes, which is applied to a system for synchronous measurement of multiple parameters in fiber optic gyroscopes. The system includes an optical path module, a photodetector module, and an optical signal modulation and processing module, and includes the following steps: Obtain a modulation signal through the optical signal modulation and processing module; Based on the modulation signal, obtain several groups of interference light intensity signals through the optical path module; Obtain corresponding sampling signals based on the light intensity signals through the photodetector module; Obtain detection channel parameters, feedback channel parameters, and residual phase based on the sampling signals through the optical signal modulation and processing module.

[0006] Preferably, the step of obtaining modulation signals through the optical signal modulation and processing module further includes: Preset the modulation phase constant Φ b and the detection channel parameter modulation phase constant Φ d ; Obtain the transit time of the fiber loop of the optical path module; Construct a phase modulation waveform, which includes a stepped wave with 5 phase states, the duration of each stepped wave is the transit time, and the modulation phases of the stepped waves with 5 phase states are as follows: ; Obtain modulation signals based on the phase modulation waveform by superimposing the feedback phase and digital-to-analog conversion.

[0007] Preferably, the step of obtaining corresponding sampling signals based on the light intensity signals through the photodetector module further includes: The phase magnitudes of the light intensity signals are respectively: where Φ b is the modulation phase constant, and Φ d is the detection channel parameter modulation phase constant; Obtain corresponding sampling signals based on the light intensity signals through photoelectric conversion, amplification, and analog-to-digital conversion.

[0008] Preferably, the step of obtaining detection channel parameters, feedback channel parameters, and residual phase based on the sampling signals through the optical signal modulation and processing module further includes: Obtain the feedback channel parameters based on the second sampling signal and the third sampling signal of the sampling signals; Obtain detection channel parameters and residual phase based on the first sampling signal, the second sampling signal, the fourth sampling signal, and the fifth sampling signal of the sampling signals.

[0009] Preferably, the value range of the modulation phase constant Φ b is (0, π), and the value range of Φ b + Φ d is (0, π).

[0010] Preferably, the step of obtaining the feedback channel parameters based on the second sampling signal and the third sampling signal includes: Obtain a correction signal S based on the second sampling signal and the third sampling signal fb , and the calculation expression is as follows: In the formula, DB[i] is the second sampling signal at the modulation period of i, and DC[i] is the third sampling signal at the modulation period of i; Obtain the feedback channel parameter based on the correction signal, and the calculation expression is as follows: In the formula, Dfb[i - 1] is the feedback channel parameter at the (i - 1) modulation period, Dfb[i] is the feedback channel parameter at the i modulation period, and K is the iteration coefficient.

[0011] Preferably, the steps of obtaining the detection channel parameter and the residual phase based on the first sampling signal, the second sampling signal, the fourth sampling signal, and the fifth sampling signal of the sampling signal further include: Obtain the detection channel parameter Dd[i] based on the fourth sampling signal and the fifth sampling signal, and the calculation expression is as follows: In the formula, DD[i] and DE[i] are the fourth sampling signal and the fifth sampling signal at the modulation period of i respectively, Φ b is the modulation phase constant, and Φ d is the modulation phase constant of the detection channel parameter; Obtain the residual phase based on the detection channel parameter, the first sampling signal, and the second sampling signal.

[0012] Preferably, the calculation expression for obtaining the residual phase based on the detection channel parameter, the first sampling signal, and the second sampling signal is as follows: In the formula, D d [i], DA[i], and DB[i] are the detection channel parameter, the first sampling signal, and the second sampling signal at the modulation period of i respectively, and Φ b is the modulation phase constant.

[0013] The second aspect of the present invention provides a fiber optic gyro multi-parameter synchronous measurement system, including: An optical signal modulation and processing module, configured to obtain a phase modulation waveform, to obtain a detection channel parameter, a feedback channel parameter, and a residual phase based on the input digital signal through processing, and to output a voltage modulation signal and a feedback phase based on the detection channel parameter, the feedback channel parameter, and the residual phase through processing; An optical path module, configured to obtain several groups of interfering optical signals based on the cooperation of the optical signal and the phase modulation waveform; An optoelectronic detector module for obtaining a digital signal by amplifying and analog-to-digital converting an interference-based optical signal; The optical signal modulation and processing module is respectively connected to the optoelectronic detector module and the optical path module, and the optical path module is connected to the optoelectronic detector module.

[0014] Preferably, the optical path module includes a light source module, a coupler module, an optical fiber loop module, and a Y waveguide module. The light source module is used to provide an optical signal; the coupler module is used to control the input and output coupling of the optical signal; the optical fiber loop module is used to provide a transmission medium for the input optical signal and introduce a Sagnac phase difference; the Y waveguide module is used to perform beam splitting, beam combining, and phase modulation processing on the input optical signal; the coupler module is respectively connected to the light source module, the Y waveguide module, and the optoelectronic detector module, the Y waveguide module is connected to the optical signal modulation and processing module, and two symmetric ports of the optical fiber loop module are respectively connected to two ports of the Y waveguide module.

[0015] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art: The present invention reforms the signal processing process of a conventional fiber optic gyroscope, enabling the optical signal modulation and processing module to be compatible with the signal modulation and demodulation functions. The input modulation signal of the optical path module is processed by the optoelectronic detector module to obtain a digital signal, realizing the real-time and synchronous measurement of the detection channel parameters, feedback channel parameters, and residual phase in the fiber optic gyroscope within a single modulation period. This system has a small modification amount and can simultaneously obtain the working parameter values of the fiber optic gyroscope in real time, achieving precise real-time measurement of the working parameters of the fiber optic gyroscope.

[0016] The present invention realizes the real-time calculation and acquisition of parameters by constructing calculation models for detection channel parameters, feedback channel parameters, and residual phase and calculating to obtain the corresponding working parameters, and realizes the real-time and synchronous measurement of the detection channel parameters, feedback channel parameters, and residual phase in the fiber optic gyroscope within a single modulation period. This method can be used for the precise real-time control of the working parameters of the fiber optic gyroscope, and simultaneously monitor the signal channel parameters of the fiber optic gyroscope under complex environmental conditions in real time to realize the dynamic performance evaluation of the fiber optic gyroscope, having strong engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further details the specific embodiments of the present invention with reference to the drawings, where: Figure 1 is a flowchart of a method for synchronously measuring multiple parameters of a fiber optic gyroscope according to the present invention; Figure 2 is a schematic structural diagram of a system for synchronously measuring multiple parameters of a fiber optic gyroscope according to the present invention; Figure 3 It is a schematic diagram of the model of a multi-parameter synchronous measurement system for an optical fiber gyroscope in the present invention; Figure 4 It is the process of generating a modulation signal for a multi-parameter synchronous measurement method of an optical fiber gyroscope in the present invention; Figure 5 It is a schematic diagram of the process of generating an interference light intensity signal for a multi-parameter synchronous measurement method of an optical fiber gyroscope in the present invention. Specific embodiments

[0018] The following further elaborates on the present invention in detail in conjunction with the accompanying drawings and specific embodiments. According to the following description and claims, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0020] The first embodiment Refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 , the first aspect of the present invention provides a multi-parameter synchronous measurement method for an optical fiber gyroscope, which is applied to a multi-parameter synchronous measurement system for an optical fiber gyroscope. The system includes an optical path module, a photodetector module, and an optical signal modulation and processing module, and includes the following steps: Obtain a modulation signal through the optical signal modulation and processing module; Obtain several groups of interference light intensity signals through the optical path module based on the modulation signal; Obtain corresponding sampling signals through the photodetector module based on the light intensity signals; Obtain detection channel parameters, feedback channel parameters, and residual phase through the optical signal modulation and processing module based on the sampling signals.

[0021] △Φ r is the magnitude of the non-reciprocal phase shift caused by the rotation of the system device; △Φ f is the magnitude of the feedback phase; △Φ e is the remaining non-reciprocal phase shift after the non-reciprocal phase shift is superimposed with the feedback phase, which is called the residual phase, and its value is the sum of △Φ r and △Φ f . The photodetector module is the detection channel, and the expression of the sampling signal output by this detection channel is: , where ΔΦ bias is the modulation phase, and the gain coefficient is K A , and 2I0 is the optical intensity signal output by the optical path module at zero phase; Since D d reflects the gain of the detection channel and the optical intensity of the interference signal, it is defined as the detection channel parameter, and the calculation expression is: The modulation signal of the optical signal modulation and processing module generates a feedback phase optical signal through the D / A, drive, and Y waveguide module of the optical path module, which is used to generate the feedback phase required for closed-loop operation. The expression is: In the formula, D is the phase control quantity. Further, the quantity reflecting the gains of the D / A and drive and the half-wave voltage of the Y waveguide is the feedback channel parameter, and the calculation expression is: The phase modulator of the optical signal modulation and processing module performs signal phase modulation. Each phase modulation waveform period consists of a stepped wave with 5 phase states, which are defined as the first phase modulation step, the second phase modulation step, the third phase modulation step, the fourth phase modulation step, and the fifth phase modulation step. The magnitudes of the modulation phases are as follows: where Φ b is the modulation phase constant, Φ d is the modulation phase constant of the detection channel parameter, Φ b ∈ (0, π), Φ b + Φ d ∈ (0, π); The optical path module obtains the interference optical intensity signal through time-delay differential modulation, and the corresponding phase is: See Figure 4 It can be seen the superimposed waveform of the modulation signal of the phase modulator of the optical signal modulation and processing module and the feedback phase signal.

[0022] The above interference optical intensity signal is output from the Y waveguide module of the optical path module to the coupler of the optical path module and transmitted to the photodetector module.

[0023] See Figure 5 , it can be seen that the input modulation signal obtains several groups of interference optical intensity signals through the optical path module, and based on the optical intensity signals, the corresponding sampling signals are obtained through the photodetector module, and the relationship diagram among the modulation signal, the interference optical intensity signal, and the sampling signal.

[0024] The interference light intensity signal obtains the first sampling signal, the second sampling signal, the third sampling signal, the fourth sampling signal, and the fifth sampling signal through the optoelectronic detector module. The detection channel parameters, the feedback channel parameters, and the residual phase are calculated through the above digital signals. The calculation process of the feedback channel parameters is as follows: Based on the second sampling signal and the third sampling signal, a correction signal S is obtained fb , and the calculation expression is: In the formula, DB[i] is the second sampling signal at the i-th modulation period, and DC[i] is the third sampling signal at the i-th modulation period; Based on the correction signal, the feedback channel parameters are obtained, and the calculation expression is: In the formula, Dfb[i - 1] is the feedback channel parameter at the (i - 1)-th modulation period, Dfb[i] is the feedback channel parameter at the i-th modulation period, K is the iteration coefficient, and K > 0.

[0025] The calculation expression D d [i] of the detection channel parameters is: In the formula, DD[i] and DE[i] are the fourth sampling signal and the fifth sampling signal at the i-th modulation period respectively, Φ b is the modulation phase constant, and Φ d is the detection channel parameter modulation phase constant; The calculation expression for the residual phase △Φ e is: In the formula, D d [i], DA[i], and DB[i] are the detection channel parameter, the first sampling signal, and the second sampling signal at the i-th modulation period respectively, and Φ b is the modulation phase constant.

[0026] The above calculation process only needs to add a specific phase modulation waveform in the fiber optic gyroscope to realize the real-time synchronous measurement of the detection channel parameters, the feedback channel parameters, and the residual phase, without modifying the system hardware and being compatible with the conventional modulation and demodulation process, realizing the automatic built-in test (BIT) of the above parameters. At the same time, the measurement parameters in the method can be flexibly configured according to the actual application situation.

[0027] Preferably, the step of obtaining the modulation signal through the optical signal modulation and processing module further includes: Presetting the modulation phase constant Φ b and the detection channel parameter modulation phase constant Φ d ; Obtain the transit time of the optical fiber loop of the optical path module; Construct a phase modulation waveform, which includes a staircase wave with 5 phase states. The duration of each staircase wave is the transit time, and the modulation phases of the staircase waves with 5 phase states are as follows: ; Based on the phase modulation waveform, obtain the modulation signal by superimposing the feedback phase and digital-to-analog conversion.

[0028] Preferably, the step of obtaining the corresponding sampling signal based on the optical intensity signal through the photodetector module further includes: The phase magnitudes of the optical intensity signals are respectively: In the formula, Φ b is the modulation phase constant, and Φ d is the modulation phase constant of the detection channel parameter; Based on the optical intensity signal, obtain the corresponding sampling signal through photoelectric conversion, amplification, and analog-to-digital conversion.

[0029] Preferably, the step of obtaining the detection channel parameter, feedback channel parameter, and residual phase based on the sampling signal through the optical signal modulation and processing module further includes: Obtain the feedback channel parameter based on the second sampling signal and the third sampling signal of the sampling signal; Obtain the detection channel parameter and the residual phase based on the first sampling signal, the second sampling signal, the fourth sampling signal, and the fifth sampling signal of the sampling signal.

[0030] The specific derivation process is as follows: The equations of the first sampling signal, the second sampling signal, the third sampling signal, the fourth sampling signal, and the fifth sampling signal are as follows: Subtract the equations of the fourth sampling signal and the fifth sampling signal to obtain the following equation: According to the definition of the detection channel parameter, the following calculation formula can be obtained: The residual phase can be calculated by using the detection channel parameter obtained from the first sampling signal and the second sampling signal. Let DA - DB to get: The calculation formula of the residual phase is as follows: See Figure 4 and Figure 5, preferably, the modulation phase constant Φ b has a value range of (0, π), and Φ b + Φ d has a value range of (0, π).

[0031] This embodiment does not further limit Φ b and Φ d . Optionally, Φ b adopts 0.5π, and Φ d adopts 0.25π, which can balance good measurement sensitivity and measurement accuracy.

[0032] Based on Φb and Φd being preset constant angles, referring to Figure 4 it can be seen the superimposed waveform of the modulation signal and the feedback phase signal of the phase modulator in the optical signal modulation and processing module.

[0033] Referring to Figure 5 , it can be seen the relationship diagram of the input modulation signal, the interference light intensity signals obtained through the optical path module, and the corresponding sampling signals obtained through the photodetector module based on the light intensity signals.

[0034] Preferably, the steps of obtaining the feedback channel parameters based on the second sampling signal and the third sampling signal include: Obtaining a correction signal S fb based on the second sampling signal and the third sampling signal, and the calculation expression is: In the formula, DB[i] is the second sampling signal at the i-th modulation period, and DC[i] is the third sampling signal at the i-th modulation period; Obtaining the feedback channel parameters based on the correction signal, and the calculation expression is: In the formula, Dfb[i - 1] is the feedback channel parameter at the (i - 1)-th modulation period, Dfb[i] is the feedback channel parameter at the i-th modulation period, and K is the iteration coefficient.

[0035] The specific derivation process is as follows: Constructing an error equation and an error coefficient equation including the feedback channel parameters, and the calculation expressions are respectively: In the formula, D err is the feedback channel error, D fbs is the initial value of the feedback channel parameter, D fb0 is the true value of the feedback channel, and K D is the error coefficient.

[0036] Construct a second equation and a third equation based on the second sampling signal and the third sampling signal, and the calculation expression is: where DB and DC are the second sampling signal and the third sampling signal, 2I0 is the optical intensity signal output by the optical path module at zero phase, and Φ b is the modulation phase constant, and △Φ e is the residual phase; Obtain a correction signal based on the second sampling signal and the third sampling signal, and the calculation expression is: Obtain a first correction signal equation from the correction signal, the second sampling signal equation, and the third sampling signal equation, and the calculation expression is: In the formula, K A is the detection channel gain coefficient, 2I0 is the optical intensity signal output by the optical path module at zero phase, K D is the error coefficient, Φ b is the modulation phase constant, and △Φ e is the residual phase; Construct an error phase formula Φ err , and the calculation expression is: ; Obtain a first error phase formula based on the error phase formula, and the calculation expression is Obtain a correction signal equation based on the first correction signal equation, the error phase formula, and the error coefficient equation, and the calculation expression is: The above formula needs to consider that Φ err is a small quantity relative to Φ b .

[0037] Further derivation gives the following calculation formula: The above formula gives the relationship between the feedback channel correction signal and the feedback channel parameter error. Except for D err in the formula, the others are all constants. It can be seen that the above two are inversely proportional. Through iterative calculation, D fb can be gradually corrected and continuously approximated to D fb0 , and the calculation expression is: K in the formula is the iteration coefficient, and D fb[i] is the feedback channel parameter for the i-th modulation period, D fb [i - 1] is the feedback channel parameter for the (i - 1)-th modulation period, K > 0.

[0038] Preferably, the steps of obtaining the detection channel parameter and the residual phase based on the first sampling signal, the second sampling signal, the fourth sampling signal, and the fifth sampling signal of the sampling signal further include: Obtaining the detection channel parameter Dd[i] based on the fourth sampling signal and the fifth sampling signal, and the calculation expression is: In the formula, DD[i] and DE[i] are the fourth sampling signal and the fifth sampling signal for the i-th modulation period respectively, Φ b is the modulation phase constant, Φ d is the modulation phase constant of the detection channel parameter; Obtaining the residual phase based on the detection channel parameter, the first sampling signal, and the second sampling signal.

[0039] Preferably, the calculation expression for obtaining the residual phase based on the detection channel parameter, the first sampling signal, and the second sampling signal is as follows: In the formula, D d [i], DA[i], and DB[i] are the detection channel parameter, the first sampling signal, and the second sampling signal for the i-th modulation period respectively, Φ b is the modulation phase constant.

[0040] Second Embodiment Refer to Figure 2 and Figure 3 , the second aspect of the present invention provides a fiber optic gyro multi-parameter synchronous measurement system, including: An optical signal modulation and processing module, configured to obtain a phase modulation waveform, configured to obtain a detection channel parameter, a feedback channel parameter, and a residual phase through processing based on an input digital signal, and configured to output a voltage modulation signal and a feedback phase through processing based on the detection channel parameter, the feedback channel parameter, and the residual phase; An optical path module, configured to obtain several groups of interfering optical signals based on the cooperation of an optical signal and a phase modulation waveform; A photodetector module, configured to obtain a digital signal through amplification processing and analog-to-digital conversion based on the interfering optical signals; The optical signal modulation and processing module is respectively connected to the photodetector module and the optical path module, and the optical path module is connected to the photodetector module.

[0041] The photodetector module includes a PIN diode, an AMP preamplifier, and an A / D converter. The optical intensity signal sequentially passes through the PIN diode, the AMP preamplifier, and the A / D converter to obtain the corresponding digital signal. This module is the detection channel, and the gain coefficient is K. A The modulation signal of the optical signal modulation and processing module generates a feedback phase optical signal through the D / A, drive, and Y waveguide module of the optical path module, which is used to generate the feedback phase required for closed-loop operation, so that the system always operates at the closed-loop zero point.

[0042] See Figure 2 and Figure 3 , preferably, the optical path module includes a light source module, a coupler module, an optical fiber loop module, and a Y waveguide module. The light source module is used to provide an optical signal; the coupler module is used to control the input and output coupling of the optical signal; the optical fiber loop module is used to provide a transmission medium for the input optical signal and introduce the Sagnac phase difference; the Y waveguide module is used to perform beam splitting, beam combining, and phase modulation processing on the input optical signal; the coupler module is respectively connected to the light source module, the Y waveguide module, and the photodetector module, the Y waveguide module is connected to the optical signal modulation and processing module, and the two symmetric ports of the optical fiber loop module are respectively connected to the two ports of the Y waveguide module.

[0043] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0044] It should also be noted that unless otherwise clearly specified and limited, the terms "set", "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0045] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific identification content executed by the above-described system and device can refer to the corresponding process in the foregoing method embodiment.

[0046] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. A fiber optic gyroscope multi-parameter synchronous measurement method, applied to a fiber optic gyroscope multi-parameter synchronous measurement system, the system comprising an optical path module, a photodetector module, an optical signal modulation and processing module, characterized in that: The steps include: Acquire a modulated signal through the optical signal modulation and processing module; Acquire a plurality of groups of interference light intensity signals through the optical path module based on the modulation signal; Acquiring a corresponding sampling signal through the photodetector module based on the light intensity signal; Based on the sampling signal, the detection channel parameter, the feedback channel parameter and the residual phase are acquired through the optical signal modulation and processing module.

2. The method for synchronously measuring multi-parameters of an optical fiber gyroscope according to claim 1, characterized in that: The step of obtaining a modulated signal by the optical signal modulation and processing module further comprises: Preset modulation phase constant Φ b and the detection channel parameter modulation phase constant Φ d ; Obtaining the transit time of the optical fiber ring of the optical path module; A phase modulation waveform is constructed, wherein the phase modulation waveform includes a step wave of 5 phase states, the duration of each step wave is the transit time, and the modulation phases of the step waves of the 5 phase states are respectively as follows: ； A modulation signal is obtained based on the phase modulation waveform by superimposing feedback phase and digital-to-analog conversion.

3. The method for synchronously measuring multi-parameters of an optical fiber gyroscope according to claim 1, characterized in that: The step of acquiring a corresponding sampling signal through the photodetector module based on the light intensity signal further includes: The phase sizes of the light intensity signals are respectively: Where Φ b is the modulation phase constant, Φ d Modulate the phase constant for detecting channel parameters; Based on the light intensity signal, a corresponding sampling signal is obtained through photoelectric conversion, amplification, and analog-to-digital conversion.

4. The method for synchronously measuring multi-parameters of an optical fiber gyroscope according to claim 1, characterized in that: The step of acquiring detection channel parameters, feedback channel parameters, and residual phase through the optical signal modulation and processing module based on the sampling signal further includes: Acquire the feedback channel parameter based on the second sampling signal and the third sampling signal of the sampling signal; A detection channel parameter and a residual phase are acquired based on the first sampling signal, the second sampling signal, the fourth sampling signal and the fifth sampling signal of the sampling signal.

5. A fiber optic gyroscope multi-parameter synchronous measurement method according to claim 2 or 3, characterized in that: Modulation phase constant Φ b The value range is (0, π), Φ b +Φ d The value range of is (0, π).

6. The method for synchronously measuring multi-parameters of an optical fiber gyroscope according to claim 4, characterized in that: The step of acquiring the feedback channel parameter based on the second sampling signal and the third sampling signal comprises: Acquire a correction signal S based on the second sampling signal and the third sampling signal fb , the calculation expression is: Wherein, DB[i] is the second sampling signal of the i-th modulation cycle, DC[i] is the third sampling signal of the i-th modulation cycle; The feedback channel parameter is obtained based on the correction signal, and the calculation expression is: Where D fb [i-1] is the feedback channel parameter of the i-1th modulation cycle, D fb [i] is the feedback channel parameter of the i-th modulation cycle, and K is the iteration coefficient.

7. The method for synchronously measuring multi-parameters of an optical fiber gyroscope according to claim 4, characterized in that: The step of acquiring detection channel parameters and residual phase based on the first sampling signal, the second sampling signal, the fourth sampling signal, and the fifth sampling signal of the sampling signal further includes: The detection channel parameter D is obtained based on the fourth sampling signal and the fifth sampling signal d [i], the calculation expression is: Wherein DD[i] and DE[i] are respectively the fourth sampling signal and the fifth sampling signal of the i-th modulation period, Φ b is the modulation phase constant, Φ d Modulate the phase constant for detecting channel parameters; A residual phase is acquired based on the detection channel parameter, the first sampling signal, and the second sampling signal.

8. The method for synchronously measuring multi-parameters of an optical fiber gyroscope according to claim 7, characterized in that: The calculation expression for obtaining the residual phase based on the detection channel parameters, the first sampling signal, and the second sampling signal is as follows: Where D d [i], DA[i], DB[i] are respectively the detection channel parameters of the i-th modulation period, the first sampling signal, the second sampling signal, Φ b is the modulation phase constant.

9. A fiber optic gyroscope multi-parameter synchronous measurement system, characterized in that: include: An optical signal modulation and processing module, used to obtain a phase modulation waveform, used to obtain detection channel parameters, feedback channel parameters, and residual phase through processing based on an input digital signal, and used to obtain a feedback phase and an output modulation signal through processing based on the detection channel parameters, feedback channel parameters, and residual phase; An optical path module, used for obtaining a plurality of groups of interfering optical signals based on the combination of optical signals and phase modulation waveforms; A photoelectric detector module, used for obtaining a digital signal based on the interfering optical signal through photoelectric conversion, amplification, and analog-to-digital conversion; The optical signal modulation and processing module is connected to the photoelectric detector module and the optical path module respectively, and the optical path module is connected to the photoelectric detector module.

10. The fiber optic gyro multi-parameter synchronous measurement system according to claim 9, characterized in that: The optical path module includes a light source module, a coupler module, a fiber ring module, and a Y-waveguide module. The light source module is used to provide an optical signal; the coupler module is used to perform input and output coupling control on the optical signal; the fiber ring module is used to provide a transmission medium for the input optical signal and introduce a Sagnac phase difference; the Y-waveguide module is used to perform beam splitting, beam combining, and phase modulation processing based on the input optical signal; the coupler module is respectively connected to the light source module, the Y-waveguide module, and the photodetector module, the Y-waveguide module is connected to the optical signal modulation and processing module, and the two symmetrical ports of the fiber ring module are respectively connected to the two ports of the Y-waveguide module.

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