CN115420272B - Method for realizing adaptive suppression of relative intensity noise of optical fiber gyro light source - Google Patents
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Abstract
The invention discloses a method for realizing self-adaptive suppression of relative intensity noise of a fiber-optic gyroscope light source, which comprises the steps of setting corresponding sampling time sequences by using an analog-to-digital converter at sampling frequency when the suppression effect of the relative intensity noise of the light source is reduced, and collecting signals in the corresponding sampling time sequences to obtain sampling points and sampling integral values corresponding to the time sequences; calculating according to the sampling points and the sampling integral value to obtain a direct current component and a peak value of a signal reaching the photoelectric detector; calculating to obtain signal light power and reference light power; the reference light power and the signal light power are subjected to a ratio, and modulation depth is adjusted according to the ratio, so that the numerical value of the ratio is equal to 1; on the basis of not introducing any device, the dynamic monitoring of the signal light power and the reference light power is realized, and the self-adaptive suppression function of the relative intensity noise of the light source is realized in the simplest form.
Description
Technical Field
The invention relates to the technical field of fiber-optic gyroscopes, in particular to a method for realizing self-adaptive suppression of relative intensity noise of a fiber-optic gyroscope light source.
Background
The fiber optic gyroscope is widely applied to various fields such as missile guidance, satellite navigation, attitude control and the like by virtue of the characteristics of high measurement precision, good sensitivity, large dynamic range, small volume, light weight, long service life, easy integration and the like. With the continuous improvement of the performance of the platform system, the requirement for the detection precision of the fiber optic gyroscope is also increased, so how to further reduce the noise of the high-precision fiber optic gyroscope and improve the detection precision have become a research hot spot in the field in recent years. The factors influencing the detection precision of the fiber optic gyroscope are complex, wherein the light source relative intensity Noise (RELATIVE INTENSITY Noise, RIN) is one of the main factors, so that various research organizations in the world develop series researches on the light source relative intensity Noise suppression and make breakthrough progress, wherein fig. 1 is one of the suppression schemes, is a typical schematic diagram of the light source relative intensity Noise cancellation scheme based on intensity superposition, and mainly comprises a light source, a 50:50 polarization maintaining coupler, an Ns: nr polarization maintaining coupler, an integrated optical modulator, a sensitive fiber ring, a detector and a signal processing module.
The light source relative intensity noise cancellation optical path scheme shown in fig. 1 can utilize two beams of light which are in the same spectrum and have the vertical polarization state to be superimposed on the basis of not damaging the minimum reciprocity structure of the fiber-optic gyroscope, and the aim of suppressing the relative intensity noise cancellation under the characteristic frequency point is achieved by adjusting the intensity ratio and the time delay between the signal light and the reference light. According to the structural characteristics of the fiber optic gyroscope, the scheme can effectively inhibit the relative intensity noise of the light source at the angular rate demodulation frequency, improve the detection signal to noise ratio of the gyroscope and further optimize the detection precision. However, in practical use, due to factors such as environmental influence and degradation of device performance, loss of a signal light path and a reference light path is changed, and gyro parameters are fixed, so that the suppression effect of the light source on the relative intensity noise is affected, and the optimal suppression state is not achieved. Therefore, the related research organization provides a light source relative intensity noise self-adaptive suppression method on the basis, however, in the self-adaptive modulation suppression scheme, additional optical and electronic devices are required to be introduced, the structure is relatively complex, the uncertainty of the light path state is increased, and the further development of the optical fiber gyro in miniaturization, light weight and low cost is not facilitated.
Disclosure of Invention
The invention aims to provide a method for realizing adaptive suppression of relative intensity noise of a fiber-optic gyroscope light source so as to solve or improve at least one of the technical problems.
In view of the foregoing, a first aspect of the present invention is to provide a method for implementing adaptive suppression of noise of relative intensity of a light source of an optical fiber gyroscope.
The invention provides a method for realizing self-adaptive suppression of relative intensity noise of a fiber-optic gyroscope light source, which comprises a first polarization maintaining coupler, wherein one end of the first polarization maintaining coupler is respectively connected with a wide-spectrum light source and a first incident end of a second polarization maintaining coupler, the other end of the first polarization maintaining coupler is connected with an integrated optical modulator, the integrated optical modulator is connected with a sensitive fiber ring, an emitting end of the second polarization maintaining coupler is connected with an optical detector, the second incident end of the second polarization maintaining coupler is connected with the other end of the first polarization maintaining coupler through a delay fiber, the optical detector is connected with the integrated optical modulator through a signal processing module, and an analog-to-digital converter is arranged in the integrated optical modulator, and the method comprises the following steps: s1, when the noise suppression effect of the relative intensity of the light source is reduced, setting a corresponding sampling time sequence at a sampling frequency by utilizing an analog-to-digital converter, and collecting signals in the corresponding sampling time sequence to obtain sampling points and sampling integral values corresponding to the time sequence; s2, calculating to obtain a direct current component and a peak value of a signal reaching the photoelectric detector according to the sampling point number and the sampling integral value; s3, calculating to obtain signal light power and reference light power according to the direct current component and the peak value; s4, carrying out ratio on the reference light power and the signal light power, and adjusting modulation depth according to the ratio so that the numerical value of the ratio is equal to 1; s5, continuously repeating the steps S1-S4 in the operation of the fiber-optic gyroscope so as to achieve the optimal suppression effect of continuously keeping the relative intensity noise of the light source in the current state.
The method for realizing the self-adaptive suppression of the relative intensity noise of the optical fiber gyroscope light source can realize the self-adaptive suppression function of the relative intensity noise of the light source on the basis of not adding any extra electronic and optical components
In order to eliminate optical and electronic devices introduced in the existing intensity noise self-adaptive implementation method, the optical fiber gyro light source relative intensity noise self-adaptive suppression method is implemented by a simplest structure, on the basis of not changing the original light source relative intensity noise suppression scheme structure, the signal characteristics of an arrival optical fiber gyro photoelectric detector are utilized, the intensities of signal light and reference light are detected and separated by setting the sampling frequency and sampling time sequence of a proper analog-digital converter, on the basis, once the ratio is changed to be not 1, the modulation depth is adjusted until the state that the intensity ratio is 1 is restored again;
the scheme can realize the self-adaptive suppression function of the relative intensity noise of the light source on the basis of not adding any extra electronic and optical components, and has a certain important guiding significance in the aspects of further volume, weight and cost of the fiber-optic gyroscope.
In addition, the technical scheme provided by the embodiment of the invention can also have the following additional technical characteristics:
in any of the above technical solutions, the method for calculating the dc component and the peak value of the signal reaching the photodetector in S2 is as follows:
Wherein N 1 is the number of sampling points corresponding to the time sequence of T1 and T3, N 2 is the number of sampling points corresponding to the time sequence of T2, S DC1、SDC2、Speak is the integral value of sampling points corresponding to the time sequence of T1, T3 and T2, Respectively, the average value of direct current components in two adjacent tau periods,/>Is the average value of the direct current component of the signal,/>The average value of the peak value of the direct current component between two adjacent tau periods is represented by I peak (n), which is the pulse peak sampling value of the detector, and the direct current component sampling values of the detector in the time sequence time of T1 and T3 are represented by I DC1 (n) and I DC2 (n), wherein tau is the transit time of the fiber optic gyroscope, namely the time of one circle of light propagation in the fiber optic ring.
In this embodiment, for the purpose of acquisitionAnd/>Only needs to add proper AD acquisition time sequence in the detection scheme of the original fiber-optic gyroscope, and the assumption is that the time sequence time corresponding to T1 is the DC component/>In the positive modulation periodCorresponding value/>Is a sample of (2); within the time sequence time corresponding to T2, peak value/>Is a sample of (2); within the time sequence time corresponding to T3, the DC component/>In the negative modulation period/>Corresponding value/>Is a sample of the sample.
In any of the above technical solutions, the method for calculating the signal light power and the reference light power in S3 is as follows:
wherein, To reach the maximum signal light power average value without modulation of the photodetector,/>Mean value of the power of the modulated signal light for reaching the photodetector,/>For reference optical power average,/>Is the modulation depth.
In the technical scheme, in the optical fiber gyro light source relative intensity noise cancellation scheme based on intensity superposition, by combining the signal characteristics and the detection principle of the optical fiber gyro, the relation of the average value among the total signal peak value, the direct current offset, the signal light power and the reference light power reaching the detector is as follows:
On the premise that the optical fiber gyro detection closed loop is stable, the signal direct current offset reaching the detector is equal to the sum of the signal light and the reference light intensity, and the optical fiber gyro detection closed loop detection device comprises:
In the method, in the process of the invention, The average of the direct current light signals in two adjacent tau periods reaching the detector. From this, the average value/>, of the maximum signal light power without modulation, which actually reaches the detector, can be calculatedWith average value of signal light power under modulation/>Reference optical power average/>
In any of the above technical solutions, the numerical calculation formula of the ratio is specifically:
Wherein, alpha 1 is the intensity ratio of the reference light power and the signal light power.
In the technical scheme, the intensity ratio alpha 1 is calculated and judged, and the intensity ratio is always kept at 1 by changing the modulation depth, so that the optimal effect of the self-adaptive suppression of the relative intensity noise of the optical fiber gyro light source is ensured.
Compared with the prior art, the invention has the following beneficial effects:
on the basis of not introducing any device, the dynamic monitoring of the signal light power and the reference light power is realized;
In the simplest form, the self-adaptive suppression function of the relative intensity noise of the light source is realized, and the further development of the optical fiber gyroscope in the aspects of reducing the power consumption, the volume, the cost and the like is promoted
Additional aspects and advantages of embodiments according to the invention will be apparent from the description which follows, or may be learned by practice of embodiments according to the invention.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic diagram of an exemplary light source relative intensity noise cancellation scheme based on intensity superposition;
FIG. 2 is a schematic diagram of a conventional adaptive suppression device for the relative intensity noise of a fiber-optic gyroscope light source;
FIG. 3 is a schematic diagram of the modulation and demodulation principle of the fiber-optic gyroscope of the present invention;
FIG. 4 is a schematic diagram of the detector signal and acquisition timing based on the light source relative intensity noise suppression scheme of the present invention;
FIG. 5 is a schematic block diagram of a novel implementation of the adaptive suppression device for the relative intensity noise of the fiber-optic gyroscope light source of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Example 1
An embodiment of the first aspect of the present invention, as shown in fig. 1-5, provides a method for implementing adaptive noise suppression based on relative intensity of a light source of an optical fiber gyroscope. Wherein the method comprises the following steps:
fig. 3 is a schematic diagram of a typical modem principle of a fiber optic gyroscope, and in combination with the optical path structure shown in fig. 1, since the reference light reaching the photodetector is not modulated, and is thus reflected as a direct current component at the photodetector, the total light intensity reaching the photodetector can be expressed as:
wherein, Is the maximum signal light power average value reaching the photoelectric detector without modulation,/>For the reference light power average to reach the photodetector,/>For phase difference corresponding to angular rate,/>For feedback phase difference,/>To modulate the square wave phase difference,/>Is the modulation depth.
According to the modulation-demodulation principle of the fiber-optic gyroscope, the light intensity in two adjacent tau periods reaching the photoelectric detector can be expressed as follows:
then the maximum optical power of the photodetector is reached without modulation, i.e. signal peak The demodulated value of the angular rate is the difference between the signals in adjacent two periods:
the visible reference light does not affect the demodulation value of the angular rate, and the sum of signals of two adjacent periods is:
In the full-digital closed loop detection process of the fiber optic gyroscope, when the closed loop tends to be stable, the feedback phase difference is the same as the phase difference corresponding to the angular rate in size and opposite in sign, so that the sum of signals of two adjacent periods can be expressed as:
And the average value is the sum of the modulated signal light power and the reference light power, namely the average value of the direct current offset of the light power reaching the photoelectric detector
Based on the above analysis, based on the optical path structure shown in fig. 1, the light intensity peak value and the dc offset after the signal light reaching the photodetector and the reference light are combined after modulation are respectively:
Thus, the modulation depth is combined with a known variable The average value/>, of the maximum signal light power without modulation, which actually reaches the photoelectric detector, can be calculated by the formula (7) and the formula (8)With modulated signal light power mean/>Reference optical power mean/>The method comprises the following steps of:
In the light source relative intensity noise-based cancellation scheme shown in fig. 1, the intensity ratio of the actual signal light power to the reference light power reaching the photodetector can be expressed as:
thus, as long as the peak value of the total signal reaching the photodetector can be collected And DC component/>The corresponding signal light power/>, can be obtainedReference light Power/>And an intensity ratio α 1 therebetween.
For collectingAnd/>Only needs to add proper AD acquisition time sequence in the detection scheme of the original fiber-optic gyroscope, as shown in fig. 4, the time sequence time corresponding to T1 is the DC component/>At positive modulation period/>Sampling of the corresponding value I 1; within the time sequence time corresponding to T2, peak value/>Is a sample of (2); within the time sequence time corresponding to T3, the DC component/>In the negative modulation period/>Sampling of the corresponding value I 1; the corresponding sample value can be expressed as:
Wherein N 1 is the number of sampling points corresponding to the time sequence of T1 and T3, N 2 is the number of sampling points corresponding to the time sequence of T2, S DC1、SDC2、Speak is the integral value of sampling points corresponding to the time sequence of T1, T3 and T2, Respectively, the average value of direct current components in two adjacent tau periods,/>Is the average value of the direct current component of the signal,/>The average value of the peak value of the direct current component between two adjacent tau periods is represented by I peak (n), which is the pulse peak sampling value of the detector, and the direct current component sampling values of the detector in the time sequence time of T1 and T3 are represented by I DC1 (n) and I DC2 (n), wherein tau is the transit time of the fiber optic gyroscope, namely the time of one circle of light propagation in the fiber optic ring.
Therefore, the digital value obtained by corresponding sampling can be calculated by setting the sampling frequency of the proper analog-digital converter and matching with the corresponding time sequence and the acquisition periodFurther calculate and get/>And alpha 1, and taking the same as a monitoring reference, adjusting the modulation depth, and finally realizing the self-adaptive suppression of the relative intensity noise of the light source, wherein the schematic diagram of the whole suppression scheme is shown in fig. 5.
Comparative example 1
The light source relative intensity noise cancellation optical path scheme shown in fig. 1 can utilize superposition of two beams of light with the same spectrum and vertical polarization state to achieve the purpose of suppressing relative intensity noise cancellation under a characteristic frequency point on the basis of not damaging the minimum reciprocity structure of the optical fiber gyro, and according to researches, the ratio of the light source relative intensity noise power spectral density after superposition of the two beams of light with the same spectrum and vertical polarization state to the light source relative intensity noise power spectral density in the original signal light is shown as
Wherein RIN d (v) and RIN (v) respectively represent the relative intensity noise power spectral density of the light source after the superposition of the two light beams and before the superposition, alpha 1 is the intensity ratio of the actual signal light power to the reference light power reaching the photoelectric detector at the current moment, t 1 is the time delay between the signal light and the reference light, and v is the frequency. Under this scheme, when the signal light reaching the photodetector coincides with the reference light intensity, i.e., α 1 =1, the light source relative intensity noise can be theoretically eliminated at the frequency v=1/(2 t 1). The time delay of the signal light and the reference light is exactly τ+t e (except for the optical fiber ring), so that when the length of the optical fiber in the reference light path is properly increased, and t e =0, namely t 1 =τ, the relative intensity noise of the light source can be effectively restrained at the frequency v=1/(2τ), namely the angular rate demodulation frequency of the optical fiber gyroscope, the detection signal-to-noise ratio of the optical fiber gyroscope is increased, and the detection precision is improved, so that keeping the signal light reaching the photoelectric detector consistent with the reference light intensity is a key point for realizing the restraint of the relative intensity noise of the light source.
Comparative example 2
Fig. 2 is a schematic diagram of a typical principle of a conventional adaptive suppression device for noise of relative intensity of a fiber-optic gyroscope light source, wherein an additional beam splitting ratio Na is added on the basis of fig. 1: a polarization maintaining coupler of Nb and a detector B. The detector A is used for receiving the optical signals after the signal light path is combined with the reference light path, the detector B is used for receiving the optical signals branched by the reference light path, and proper beam splitting ratio is given through proper calculation.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (4)
1. A method for realizing adaptive suppression of relative intensity noise of a light source of a fiber-optic gyroscope comprises the following steps: the system comprises a first polarization maintaining coupler, wherein one end of the first polarization maintaining coupler is respectively connected with a wide-spectrum light source and a first incidence end of a second polarization maintaining coupler, the other end of the first polarization maintaining coupler is connected with an integrated optical modulator, a sensitive optical fiber ring is connected to the integrated optical modulator, an emission end of the second polarization maintaining coupler is connected with an optical detector, a second incidence end of the second polarization maintaining coupler is connected with the other end of the first polarization maintaining coupler through a delay optical fiber, the optical detector is connected with the integrated optical modulator through a signal processing module, and an analog-to-digital converter is arranged in the integrated optical modulator, and the system is characterized by comprising the following steps:
S1, when the noise suppression effect of the relative intensity of the light source is reduced, setting a corresponding sampling time sequence at a sampling frequency by utilizing an analog-to-digital converter, and collecting signals in the corresponding sampling time sequence to obtain sampling points and sampling integral values corresponding to the time sequence;
s2, calculating to obtain a direct current component and a peak value of a signal reaching the photoelectric detector according to the sampling point number and the sampling integral value;
s3, calculating to obtain signal light power and reference light power according to the direct current component and the peak value;
s4, carrying out ratio on the reference light power and the signal light power, and adjusting modulation depth according to the ratio so that the numerical value of the ratio is equal to 1;
S5, continuously repeating the steps S1-S4 in the operation of the fiber-optic gyroscope so as to achieve the optimal suppression effect of continuously keeping the relative intensity noise of the light source in the current state.
2. The method for adaptively suppressing noise of relative intensity of a fiber-optic gyroscope light source according to claim 1, wherein the method for calculating the dc component and peak value of the signal reaching the photodetector in S2 is as follows:
Wherein N 1 is the number of sampling points corresponding to the time sequence of T1 and T3, N 2 is the number of sampling points corresponding to the time sequence of T2, S DC1、SDC2、Speak is the integral value of sampling points corresponding to the time sequence of T1, T3 and T2, Respectively, the average value of direct current components in two adjacent tau periods,/>Is the average value of the direct current component of the signal,/>The average value of the peak value of the direct current component between two adjacent tau periods is represented by I peak (n), which is the pulse peak sampling value of the detector, and the direct current component sampling values of the detector in the time sequence time of T1 and T3 are represented by I DC1 (n) and I DC2 (n), wherein tau is the transit time of the fiber optic gyroscope, namely the time of one circle of light propagation in the fiber optic ring.
3. The method for adaptively suppressing the relative intensity noise of the optical fiber gyro light source according to claim 2, wherein the method for calculating the signal light power and the reference light power in S3 is as follows:
wherein, To reach the maximum signal light power average value without modulation of the photodetector,/>Mean value of the power of the modulated signal light for reaching the photodetector,/>For reference optical power average,/>Is the modulation depth.
4. The method for adaptively suppressing the relative intensity noise of the optical fiber gyro light source according to claim 3, wherein a numerical calculation formula of the ratio is specifically as follows:
Wherein, alpha 1 is the intensity ratio of the signal light power and the reference light power.
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| CN103983261A (en) * | 2014-04-28 | 2014-08-13 | 北京大学 | A fiber optic gyroscope based on vector space analysis and a signal processing method thereof |
| CN110319827A (en) * | 2019-07-17 | 2019-10-11 | 北京航空航天大学 | A kind of relative intensity noise of light source of fiber-optic gyroscope Adaptive Suppression device |
| CN111044026A (en) * | 2019-12-30 | 2020-04-21 | 北京航空航天大学 | Relative intensity noise suppression device for high-precision fiber-optic gyroscope |
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| CN103983261A (en) * | 2014-04-28 | 2014-08-13 | 北京大学 | A fiber optic gyroscope based on vector space analysis and a signal processing method thereof |
| CN110319827A (en) * | 2019-07-17 | 2019-10-11 | 北京航空航天大学 | A kind of relative intensity noise of light source of fiber-optic gyroscope Adaptive Suppression device |
| CN111044026A (en) * | 2019-12-30 | 2020-04-21 | 北京航空航天大学 | Relative intensity noise suppression device for high-precision fiber-optic gyroscope |
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