CN116124116A - Optical fiber gyroscope and comb pulse error suppression system and method - Google Patents
Optical fiber gyroscope and comb pulse error suppression system and method Download PDFInfo
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- CN116124116A CN116124116A CN202211634530.2A CN202211634530A CN116124116A CN 116124116 A CN116124116 A CN 116124116A CN 202211634530 A CN202211634530 A CN 202211634530A CN 116124116 A CN116124116 A CN 116124116A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
Abstract
The invention discloses an optical fiber gyroscope and a comb pulse error suppression system and method. The optical fiber gyroscope comprises a wide-spectrum light source, an optical fiber interferometer, an electro-optic intensity modulator, a photoelectric detector and a signal processing circuit; the broad spectrum light source is used for providing a broad spectrum light signal for the optical fiber interferometer; the optical fiber interferometer is used for generating at least one optical interference signal according to the wide-spectrum optical signal and the mechanical rotation; the electro-optic intensity modulator is used for inhibiting comb-shaped pulses of the optical interference signals according to at least one modulation signal; the photoelectric detector is used for generating an electrical measurement signal according to the suppressed optical interference signal; the signal processing circuit is used for modulating the waveform of the wide-spectrum optical signal which is reversely propagated in the optical fiber interferometer according to the electrical measurement signal and generating a modulation signal according to the electrical measurement signal; the signal processing circuit is used for acquiring rotation information of mechanical rotation according to the electrical measurement signal. The embodiment of the invention fundamentally inhibits the influence caused by comb pulse errors through the improvement of the electro-optical intensity modulator and the signal processing circuit, expands the effective sampling interval of the optical interference signal and inhibits zero offset errors caused by demodulation of the electrical measurement signal.
Description
Technical Field
The invention relates to the field of optical fiber sensing, in particular to an optical fiber gyroscope and a comb pulse error suppression system and method.
Background
The fiber optic gyroscope (Fiber Optic Gyroscope) is an all-solid state design angular rate sensor. The optical fiber gyroscope has the advantages of flexible and various structures, high reliability, long service life, wide precision application range and the like, has various applications in the directions of attitude measurement, control, navigation guidance and the like, and is one of the most mainstream inertial instruments in the twenty-first century.
The most common interferometric digital closed-loop fiber-optic gyroscope schemes today employ square wave modulation or variant square wave modulation, with non-idealities in the modulated waveform resulting in comb pulses in the fiber-optic interferometer output optical signal. The optical signal shown in fig. 1 has a comb pulse characteristic and the ringing effect caused by the comb pulse is one of the important error sources of the digital closed-loop fiber optic gyroscope.
Traditional processing schemes for comb pulses include sampling to avoid the pulse and its affected location. However, in practice, it is very difficult to determine the influence range of the comb pulse under various environments such as temperature, vibration and impact, and thus it is also difficult to arrange sampling points. If the sampling points are too few, effective information is lost, resulting in reduced gyroscope output accuracy.
Disclosure of Invention
Based on this, a first aspect of the embodiment of the present invention discloses a fiber optic gyroscope. The optical fiber gyroscope comprises a wide-spectrum light source, an optical fiber interferometer, an electro-optic intensity modulator, a photoelectric detector and a signal processing circuit; the broad spectrum light source is used for providing a broad spectrum light signal to the optical fiber interferometer; the optical fiber interferometer is used for generating at least one optical interference signal according to the wide-spectrum optical signal and the mechanical rotation; the electro-optic intensity modulator is used for inhibiting comb-shaped pulses of the optical interference signal according to at least one modulation signal; the photoelectric detector is used for generating an electrical measurement signal according to the suppressed optical interference signal; the signal processing circuit is used for modulating the waveform of the wide-spectrum optical signal which reversely propagates in the optical fiber interferometer according to the electric measurement signal and generating the modulation signal according to the electric measurement signal; the signal processing circuit is used for acquiring rotation information of the mechanical rotation according to the electric measurement signal.
In the disclosure of the embodiment of the invention, the electro-optical intensity modulator suppresses or attenuates the time domain portion where the comb pulse of the optical interference signal is located according to the modulation signal.
In the disclosure of the embodiment of the invention, the signal processing circuit generates the modulation signal capable of modulating the switch control time sequence of the electro-optical intensity modulator according to the electrical measurement signal.
The electro-optic intensity modulator is a LiNbO3 waveguide type Mach-Zehnder electro-optic intensity modulator disclosed in the embodiment of the invention.
In the disclosure of the embodiment of the invention, the signal processing circuit generates a square wave modulation signal according to the electrical measurement signal and the optical path parameter of the optical fiber interferometer, and modulates the waveform of the wide-spectrum optical signal counter-propagating in the optical fiber interferometer according to the square wave modulation signal; the optical fiber interferometer generates the optical interference signal with the comb pulse according to a part of the wide-spectrum optical signal which is transmitted in the forward direction, a part of the wide-spectrum optical signal which is transmitted in the backward direction after modulation and the mechanical rotation.
The signal processing circuit is used for filtering, amplifying, sampling and demodulating the electrical measurement signals.
In the disclosure of the embodiment of the invention, the signal processing unit drives the broad spectrum light source to provide the output power of the broad spectrum light signal according to the electrical measurement signal.
The second aspect of the embodiment of the invention discloses a comb pulse error suppression system of an optical fiber gyroscope. The optical fiber gyroscope is applied to an optical fiber gyroscope, wherein the optical fiber gyroscope comprises a wide-spectrum light source, an optical fiber interferometer and a photoelectric detector; the suppression system comprises an electro-optic intensity modulator and a signal processing circuit; the broad spectrum light source is used for providing a broad spectrum light signal to the optical fiber interferometer; the optical fiber interferometer is used for generating at least one optical interference signal according to the wide-spectrum optical signal and the mechanical rotation; the electro-optic intensity modulator is used for inhibiting comb-shaped pulses of the optical interference signal according to at least one modulation signal; the photoelectric detector is used for generating an electrical measurement signal according to the suppressed optical interference signal; the signal processing circuit is used for modulating the waveform of the wide-spectrum optical signal which reversely propagates in the optical fiber interferometer according to the electric measurement signal and generating the modulation signal according to the electric measurement signal; the signal processing circuit is used for acquiring rotation information of the mechanical rotation according to the electric measurement signal.
The third aspect of the embodiment of the invention discloses a comb pulse error suppression method for an optical fiber gyroscope. The optical fiber gyroscope comprises a wide-spectrum light source, an optical fiber interferometer, an electro-optic intensity modulator, a photoelectric detector and a signal processing circuit; the suppression method comprises the steps that the broad spectrum light source provides a broad spectrum light signal to the optical fiber interferometer; the optical fiber interferometer generates at least one first optical interference signal according to the mechanical rotation generated by forward and backward propagation and inertia space of the wide-spectrum optical signal; the photoelectric detector generates a first electric measurement signal according to the first optical interference signal; the signal processing circuit modulates the wide-spectrum optical signal which is reversely propagated in the optical fiber interferometer according to the first electric measurement signal long wave; the optical fiber interferometer generates a second optical interference signal with comb-shaped pulses according to a part of the wide-spectrum optical signals which are transmitted forward and a part of the wide-spectrum optical signals which are transmitted backward after modulation and the mechanical rotation; the photodetector generates a second electrical measurement signal according to the second optical interference signal with the comb pulse; the signal processing circuit generates the modulation signal according to the second electric measurement signal; the electro-optical intensity modulator is used for suppressing the time domain of the comb pulse of the second optical interference signal according to the modulation signal.
In the disclosure of the embodiment of the invention, the photodetector generates a third electrical measurement signal according to the suppressed second optical interference signal; the signal processing circuit obtains rotation information of the mechanical rotation according to the third electric measurement signal.
Compared with the prior art, the embodiment of the invention fundamentally inhibits the influence caused by comb pulse errors through the improvement of the electro-optical intensity modulator and the signal processing circuit, expands the effective sampling interval of the optical interference signal and inhibits the zero offset error caused by demodulation of the electrical measurement signal.
Other features of embodiments of the present invention and advantages thereof will be apparent from the following detailed description of the disclosed exemplary embodiments with reference to the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of comb pulse signals of an optical interference signal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a fiber optic gyroscope according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of operation of a LiNbO3 waveguide Mach-Zehnder electro-optic intensity modulator according to an embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The first aspect of the embodiment of the invention discloses an optical fiber gyroscope, a comb pulse error suppression system and a comb pulse error suppression method, which are used for suppressing errors caused by comb pulses in the optical fiber gyroscope. For comb pulse generation proposed in the embodiments of the present invention, a square-wave biased modulation signal is typically applied between two opposite light signals of the optical fiber interferometer 2 in the interferometric digital closed-loop optical fiber gyroscope, and the modulation frequency of the modulation signal is related to the eigenfrequency of the optical fiber interferometer 2. The generation of comb pulses may also be caused by imperfections in the modulation of the optical signal by the modulation signal.
Specifically, there is a duration of time at the rising and falling edges of the square wave of the modulated signal, the square wave duty cycle does not form a strict equality relationship, the modulation frequency is not aligned with the eigenfrequency, etc. In this case, the waveform of the optical interference signal output from the optical fiber interferometer 2 may have comb-like pulses synchronized with the level shift of the modulated signal. At the same time, the eigenfrequency of the optical fiber interferometer 2 is temperature dependent, which causes comb pulses in the optical interference signal to be temperature dependent. And, during the duration of the comb pulse, no available fiber optic gyroscope rotational speed information is demodulated, which also causes output drift problems for the fiber optic gyroscope.
For example, comb pulses can cause transient saturation of commonly used PIN-FET detectors and post-stage amplifiers. Since the PIN-FET detector has a recovery time after saturation, the maximum value of the feedback impedance of the gain element of the PIN-FET detector is limited by the pulse amplitude rather than the useful signal amplitude, and additional signal distortion occurs when the PIN-FET detector recovers from overload, resulting in sampling and demodulation errors of the PIN-FET detector output electrical measurement signal.
For example, comb pulses have temperature instability. The instability of comb pulses and pulse decay can affect the output accuracy of the fiber optic gyroscope due to ringing effects. Specifically, although the fiber optic gyroscope samples the signal after peak decay, differential signals after different peak decay may cause an angular rate measurement error. The temperature instability of the comb pulse can cause instability in the output of the fiber optic gyroscope.
For example, the amplitude of the comb pulse limits the amplitude of the effective probe optical power, also limits the allowable gain of the signal processing circuit 5, limits the noise level of the fiber optic gyroscope output, and also limits the bandwidth of the fiber optic gyroscope.
For example, comb pulses have asymmetry. This is caused by the rising edge, falling edge and modulation amplitude of the modulation waveform being different. The asymmetry of the pulse can cause odd harmonic components of the modulation frequency, so that pulse energy is diffused, and the pulse energy is demodulated together with Sagnac phase shift during signal demodulation, thereby forming gyro output errors. And more particularly to the second point, the eigenfrequency of the optical fiber interferometer 2 shifts with temperature changes, and misalignment of the modulation frequency with the eigenfrequency increases, producing a temperature-dependent bias error.
For the suppression or attenuation of the comb pulse, from the waveform of the modulated signal, the rising edge and the falling edge of the modulated square wave are different in time, so that when the eigenfrequency changes along with the temperature, the non-ideal duty ratio can be generated, and even cosine harmonic exists in the waveform of the modulated signal, and odd sine harmonic is caused in the output of the optical fiber gyroscope. The Hou Jiediao output contains offset errors during square wave demodulation. From the waveform output by photodetector 4, when the eigenfrequency varies with temperature, an odd sine harmonic is also caused in the fiber-optic gyroscope output due to the asymmetry of the spike, resulting in a bias error in the fiber-optic gyroscope output. Then the saturation problem of the photo detector 4 still exists as the optical interference signal is detected at the photo detector 4 end, and then the differential rate demodulation error due to the pulse decay ringing effect cannot be suppressed by the improvement of the analog switching circuit alone.
Based on this, the present embodiment discloses an interferometric digital closed loop fiber optic gyroscope. The fiber optic gyroscope applies square wave modulation or variant square wave modulation, and the non-idealities of the modulated square wave waveform cause the optical interference signal waveform shown in fig. 1 to have comb pulse characteristics.
Please refer to fig. 2 and 3. Fig. 2 provides a schematic structural diagram of a fiber optic gyroscope according to an embodiment of the present invention. Fig. 3 provides a schematic structural diagram of an electro-optical intensity modulator 3 according to an embodiment of the present invention.
Fig. 2 shows that the optical fiber gyroscope according to the embodiment of the invention comprises a broad spectrum light source 1, an optical fiber interferometer 2, an electro-optical intensity modulator 3, a photodetector 4 and a signal processing circuit 5. According to the embodiment of the invention, the square wave modulation of the signal processing circuit 5 enables the optical interference signal output by the optical fiber interferometer 2 to have the comb pulse characteristic, and the electro-optic intensity modulator 3 realizes the suppression or attenuation of the comb pulse in the optical interference signal.
The broad spectrum light source 1 supplies a broad spectrum light signal which satisfies the index requirements of light power, spectrum shape, polarization characteristics, and the like to the optical fiber interferometer 2 according to the configuration.
The optical fiber interferometer 2 generates an optical interference signal according to the wide-spectrum optical signal and the mechanical rotation of the inertia space, wherein the optical interference signal carries the rotation speed information of the mechanical rotation.
The electro-optic intensity modulator 3 is a LiNbO3 waveguide type Mach-Zehnder electro-optic intensity modulator 3, is an optical modulator manufactured by applying Mach-Zehnder interference effect and electro-optic effect, and can equally divide input into two paths of optical signals, the phases of the two paths of optical signals change along with an external electric signal, and the light intensity after interference and combination also changes along with the electric signal to realize modulation of the light intensity. The LiNbO3 waveguide mach-zehnder electro-optic intensity modulator 3 has in fact the attenuation and recovery of very high bandwidth optical signals. The broad spectrum optical signal is modulated as shown in fig. 3 by modulating the electrical signal and the partial time domain selectivity of the optical interference signal achieved by the electrodes. In particular, comb pulses of a time domain portion of an optical interference signal are suppressed or attenuated.
Wherein the photodetector 4 converts the suppressed or attenuated optical interference signal into an electrical measurement signal that can be used for processing.
The signal processing circuit 5 obtains the electrical measurement signal, and obtains information carried by the electrical measurement signal through low-pass filtering, signal amplification, sampling detection and signal demodulation of the electrical measurement signal, wherein the information comprises rotation information of mechanical rotation and optical information of optical interference signals before and after suppression or attenuation, such as frequency, amplitude and the like. The signal processing circuit 5 can identify whether the optical fiber gyroscope has comb pulse characteristics in one or more time domains of the optical interference signal according to the optical information.
Meanwhile, the signal processing circuit 5 generates a square wave modulation signal according to the optical information before the LiNbO3 waveguide type Mach-Zehnder electro-optical intensity modulator 3 participates in suppressing or attenuating the optical interference signal, and the square wave modulation signal modulates the waveform of the wide-spectrum optical signal counter-propagating in the optical fiber interferometer 2. The non-ideality of square wave modulated signals is one of the possible factors that cause the optical interference signals to appear as comb pulses.
Therefore, the signal processing circuit 5 generates a modulation signal capable of modulating the switching control timing of the LiNbO3 waveguide type mach-zehnder electro-optic intensity modulator 3 from the optical information. The LiNbO3 waveguide type Mach-Zehnder electro-optic intensity modulator 3 realizes the suppression or attenuation of the time domain with the comb pulse characteristic part in the optical interference signal according to the time sequence control of the modulation signal.
Preferably, after the effective suppression of the comb pulse error in the optical interference signal is realized, the wide-spectrum optical element can improve the optical power so as to improve the bandwidth of the optical fiber gyroscope, reduce the output noise level, and improve the temperature stability of the optical fiber gyroscope and suppress long-term drift.
Compared with the prior art, the embodiment of the invention provides a comb pulse error suppression scheme based on the LiNbO3 waveguide type Mach-Zehnder electro-optical intensity modulator 3, so that the error caused by comb pulse is suppressed from the optical mode of a non-analog circuit, the effective sampling interval of an optical interference signal is expanded, the zero offset error caused by demodulation of an electrical measurement signal is suppressed, and the optical fiber gyroscope has stronger adaptive capacity to dynamic environments such as vibration, impact and the like.
The second aspect of the embodiment of the invention discloses a comb pulse error suppression system of an optical fiber gyroscope. The suppression system is applied to the improvement of the fiber optic gyroscope. The fiber optic gyroscope comprises a broad spectrum light source 1, a fiber optic interferometer 2 and a photodetector 4. The suppression system comprises an electro-optical intensity modulator 3 and a signal processing circuit 5.
The third aspect of the embodiment of the invention discloses a comb pulse error suppression method for an optical fiber gyroscope. The suppression method is applied to the optical fiber gyroscope. The suppression method may be implemented as follows.
S10, the broad spectrum light source 1 provides a broad spectrum light signal which meets the index requirements of light power, spectrum shape, polarization characteristic and the like for the optical fiber interferometer 2.
S20, the optical fiber interferometer 2 generates a first optical interference signal according to the forward and backward propagation of the wide-spectrum optical signal and the mechanical rotation generated in the inertia space. At this time, the first optical interference signal is not square-wave modulated, and comb pulses may not occur.
S30, the photodetector 4 generates a first electrical measurement signal according to the first optical interference signal conversion.
S40, the signal processing circuit 5 analyzes the information such as the frequency, the amplitude and the like of the current first optical interference signal according to the first electrical measurement signal after low-pass filtering, signal amplification, sampling detection, signal demodulation and integration. The signal processing circuit 5 modulates the counter-propagating broad spectrum optical signal in the optical fiber interferometer 2 based on the information of the first optical interference signal.
S50, the optical fiber interferometer 2 generates a second optical interference signal with comb pulse characteristics according to a part of the wide-spectrum optical signals which are transmitted in the forward direction, a part of the wide-spectrum optical signals which are transmitted in the backward direction after square wave modulation and mechanical rotation generated in an inertia space.
S60, the photodetector 4 generates a second electrical measurement signal from the second optical interference signal having the comb pulse characteristic.
S70, the signal processing circuit 5 analyzes the information such as the frequency, the amplitude and the like of the current second optical interference signal according to the second electrical measurement signal after low-pass filtering, signal amplification, sampling detection, signal demodulation and integration. The signal processing circuit 5 generates a modulation signal for causing the LiNbO3 waveguide type mach-zehnder electro-optical intensity modulator 3 to participate in the modulation of the optical interference signal based on the information of the second optical interference signal, and the modulation signal can modulate the switching control timing of the counter electrode in the LiNbO3 waveguide type mach-zehnder electro-optical intensity modulator 3.
S80, the electro-optical intensity modulator 3 suppresses or attenuates the time domain region where the comb pulse of the second optical interference signal is located according to the switching control time sequence of the modulation signal.
S90, the photodetector 4 generates a third electrical measurement signal from the suppressed second optical interference signal.
S100, the signal processing circuit 5 analyzes the information such as the frequency, the amplitude and the like of the current third optical interference signal according to the third electrical measurement signal after low-pass filtering, signal amplification, sampling detection, signal demodulation and integration. The signal processing circuit 5 acquires rotation information of the mechanical rotation of the inertial space from the third electrical measurement signal and provides an output of the optical fiber gyroscope.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A fiber optic gyroscope is characterized in that,
the optical fiber gyroscope comprises a wide-spectrum light source, an optical fiber interferometer, an electro-optic intensity modulator, a photoelectric detector and a signal processing circuit;
the broad spectrum light source is used for providing a broad spectrum light signal to the optical fiber interferometer;
the optical fiber interferometer is used for generating at least one optical interference signal according to the wide-spectrum optical signal and the mechanical rotation;
the electro-optic intensity modulator is used for inhibiting comb-shaped pulses of the optical interference signal according to at least one modulation signal;
the photoelectric detector is used for generating an electrical measurement signal according to the suppressed optical interference signal;
the signal processing circuit is used for modulating the waveform of the wide-spectrum optical signal which reversely propagates in the optical fiber interferometer according to the electric measurement signal and generating the modulation signal according to the electric measurement signal;
the signal processing circuit is used for acquiring rotation information of the mechanical rotation according to the electric measurement signal.
2. The optical fiber gyroscope according to claim 1,
the electro-optical intensity modulator suppresses or attenuates the time domain portion of the optical interference signal where the comb pulse is located according to the modulation signal.
3. The optical fiber gyro according to claim 2, wherein,
the signal processing circuit generates the modulation signal which can modulate the switch control time sequence of the electro-optic intensity modulator according to the electric measurement signal.
4. The optical fiber gyroscope according to claim 1,
the electro-optic intensity modulator is a LiNbO3 waveguide type Mach-Zehnder electro-optic intensity modulator.
5. The optical fiber gyroscope according to claim 1,
the signal processing circuit generates a square wave modulation signal according to the electric measurement signal and the optical path parameter of the optical fiber interferometer, and modulates the waveform of the wide-spectrum optical signal counter-propagating in the optical fiber interferometer according to the square wave modulation signal;
the optical fiber interferometer generates the optical interference signal with the comb pulse according to a part of the wide-spectrum optical signal which is transmitted in the forward direction, a part of the wide-spectrum optical signal which is transmitted in the backward direction after modulation and the mechanical rotation.
6. The optical fiber gyroscope according to claim 1,
the signal processing circuit is used for filtering, amplifying, sampling and demodulating the electrical measurement signal.
7. The optical fiber gyroscope according to claim 1,
the signal processing unit drives the broad spectrum light source to provide the output power of the broad spectrum light signal according to the electric measurement signal.
8. The comb pulse error suppression system of the optical fiber gyroscope is characterized by being applied to the optical fiber gyroscope, wherein the optical fiber gyroscope comprises a wide-spectrum light source, an optical fiber interferometer and a photoelectric detector;
the suppression system comprises an electro-optic intensity modulator and a signal processing circuit;
the broad spectrum light source is used for providing a broad spectrum light signal to the optical fiber interferometer;
the optical fiber interferometer is used for generating at least one optical interference signal according to the wide-spectrum optical signal and the mechanical rotation;
the electro-optic intensity modulator is used for inhibiting comb-shaped pulses of the optical interference signal according to at least one modulation signal;
the photoelectric detector is used for generating an electrical measurement signal according to the suppressed optical interference signal;
the signal processing circuit is used for modulating the waveform of the wide-spectrum optical signal which reversely propagates in the optical fiber interferometer according to the electric measurement signal and generating the modulation signal according to the electric measurement signal;
the signal processing circuit is used for acquiring rotation information of the mechanical rotation according to the electric measurement signal.
9. The comb pulse error suppression method for the optical fiber gyroscope is characterized by being applied to at least one optical fiber gyroscope, wherein the optical fiber gyroscope comprises a wide-spectrum light source, an optical fiber interferometer, an electro-optic intensity modulator, a photoelectric detector and a signal processing circuit;
the comb pulse error suppression method of the fiber optic gyroscope comprises the steps of,
the broad spectrum light source provides a broad spectrum light signal to the optical fiber interferometer;
the optical fiber interferometer generates at least one first optical interference signal according to the mechanical rotation generated by forward and backward propagation and inertia space of the wide-spectrum optical signal;
the photoelectric detector generates a first electric measurement signal according to the first optical interference signal;
the signal processing circuit modulates the wide-spectrum optical signal which is reversely propagated in the optical fiber interferometer according to the first electric measurement signal long wave;
the optical fiber interferometer generates a second optical interference signal with comb-shaped pulses according to a part of the wide-spectrum optical signals which are transmitted forward and a part of the wide-spectrum optical signals which are transmitted backward after modulation and the mechanical rotation;
the photodetector generates a second electrical measurement signal according to the second optical interference signal with the comb pulse;
the signal processing circuit generates the modulation signal according to the second electric measurement signal;
the electro-optical intensity modulator is used for suppressing the time domain of the comb pulse of the second optical interference signal according to the modulation signal.
10. The method for suppressing comb pulse errors of a fiber optic gyroscope of claim 9,
the photoelectric detector generates a third electric measurement signal according to the suppressed second optical interference signal;
the signal processing circuit obtains rotation information of the mechanical rotation according to the third electric measurement signal.
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