CN108168536A - The accurate measurement method of optical fibre gyro zero bias - Google Patents
The accurate measurement method of optical fibre gyro zero bias Download PDFInfo
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- CN108168536A CN108168536A CN201711324841.8A CN201711324841A CN108168536A CN 108168536 A CN108168536 A CN 108168536A CN 201711324841 A CN201711324841 A CN 201711324841A CN 108168536 A CN108168536 A CN 108168536A
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- optical fibre
- fibre gyro
- zero bias
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- gyro
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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
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- Radar, Positioning & Navigation (AREA)
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- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Gyroscopes (AREA)
Abstract
A kind of accurate measurement method of optical fibre gyro zero bias is provided, by measuring output of the positive optical fibre gyro being installed on horizontal base within the t time cycles and obtaining output mean value, reversely the output within the t ￠ time cycles of the optical fibre gyro that is installed on horizontal base and obtain output mean value, byWithIt calculates and obtains optical fibre gyro zero bias B0.Corresponding output mean value when the present invention is installed on horizontal base by measuring and calculating optical fibre gyro forward and reverse, realize the accurate zero bias that optical fibre gyro is obtained by corresponding output mean value computation, so as to make optical fibre gyro sensitive axes that need not be directed toward East and West direction, thoroughly eliminate the influence of earth rotation, dependence of the optical fibre gyro to test condition is reduced, accurate zero reference is provided for measuring system resolving.
Description
Technical field
The invention belongs to inertia sensing technical fields, and in particular to a kind of accurate measurement method of optical fibre gyro zero bias.
Background technology
Optical fibre gyro is a kind of novel inertia device, using the Sagnac effects of light as theoretical foundation, for measuring carrier phase
To the angle rate signal in space, belong to all solid state gyro, since with small, precision is high, and environmental suitability is strong, reliability is high
The features such as, it is one of mainstream inertia device of developed recently, therefore, establishing the optical fibre gyro leading indicator measuring method of science is
Very necessary, optical fibre gyro leading indicator is divided into two classes, and one kind is to assess fiber optic gyroscope performance index (such as：Bias instaility,
Bias repeatability, scale factory non-linearity degree and random walk etc.), one kind is characterization optical fibre gyro ATTRIBUTE INDEX (such as zero bias, mark
Spend factor).The measuring system formed using optical fibre gyro as inertia device, other than the performance indicator for meeting system requirements, more
Accurate ATTRIBUTE INDEX is provided, the zero reference or proportionate relationship calculated and outputted as system.For optical fibre gyro zero bias B0
(English represents：Bias Bias Offset) test method, i.e., when input angle speed is zero, weigh optical fibre gyro output
The size of mean value is measured, is represented with the corresponding equivalent inpnt angular speed of output quantity mean value in the stipulated time.According to《GJB2426A-
2004 method for testing optical fiber gyroscope》, optical fibre gyro is fixed on by installs fixture on horizontal reference, in order to eliminate earth rotation
Caused angular speed is influenced (except earth south poles), it is desirable that optical fibre gyro sensitive axes are directed toward East and West direction, but are actually measuring
Cheng Zhong, optical fibre gyro reference for installation axis are directed toward East and West direction, there are problems that alignment precision, unless there are special guiding calibration, test
It is required that height, limitation are big, especially for middle high-precision optical fiber gyro, sensitivity is not more than 0.5 °/h, due to earth rotation
Sensibility, zero bias test error bigger caused by sensitive axes are aligned, in summary, it is necessary to be improved.
Invention content
Present invention solves the technical problem that：A kind of accurate measurement method of optical fibre gyro zero bias is provided, by measuring and counting
It calculates optical fibre gyro forward and reverse and is installed on corresponding output mean value during horizontal base, realize by corresponding output mean value computation
The accurate zero bias of optical fibre gyro are obtained, so as to make optical fibre gyro sensitive axes that need not be directed toward East and West direction, thoroughly eliminate earth rotation
It influences, reduces dependence of the optical fibre gyro to test condition, accurate zero reference is provided for measuring system resolving.
The technical solution adopted by the present invention：The accurate measurement method of optical fibre gyro zero bias is installed on water by measuring forward direction
The output within the t time cycles of optical fibre gyro on flat pedestal simultaneously obtains output mean valueReversely it is installed on horizontal base
Output of the optical fibre gyro within the t ' time cycles simultaneously obtains output mean valueByWithObtain optical fibre gyro zero bias B0Calculating
Formula is as follows：
Wherein, K is optic fiber gyroscope graduation factor.
The accurate measurement method of optical fibre gyro zero bias, includes the following steps：
1) sensitive axes of optical fibre gyro are installed on horizontal base and optical fibre gyro remains stationary state straight up, when
Between the output quantity F of optical fibre gyro is measured in period ti(i=1,2,3 ... n), passes through optical fibre gyro output quantity FiCalculate optical fiber top
The output mean value of spiral shellFormula it is as follows：
Wherein K be optic fiber gyroscope graduation factor, B0For optical fibre gyro zero bias, ΩeFor
Earth rotation angular speed,The latitude local for test；
2) sensitive axes of optical fibre gyro are installed on horizontal base and optical fibre gyro remains stationary state straight down, when
Between period t ' it is interior measure optical fibre gyro output quantity Fi' (i=1,2,3 ... n), passes through optical fibre gyro output quantity Fi' calculating optical fiber
The output mean value of gyroFormula it is as follows：
3) the corresponding earth rate component of local latitude is eliminated after step 1) is added with the formula in step 2), is obtained
Optical fibre gyro zero biasDue to Therefore it obtains
Optical fibre gyro zero bias
The present invention compared with prior art the advantages of：
1st, make optical fibre gyro sensitive axes that need not be directed toward East and West direction by this method, thoroughly eliminate earth rotation to optical fibre gyro
Influence, reduce dependence of the optical fibre gyro to test condition, resolved for measuring system and accurate zero reference is provided；
2nd, test and computational methods are simple and effective, and practical, easily operated, and the optical fibre gyro zero bias precision calculated is high.
Specific embodiment
Embodiment
The accurate measurement method of optical fibre gyro zero bias, by measuring the positive optical fibre gyro being installed on horizontal base in t
Output in time cycle simultaneously obtains output mean valueReversely the optical fibre gyro on horizontal base is installed within the t ' time cycles
Output and obtain output mean valueByWithObtain optical fibre gyro zero bias B0Calculation formula it is as follows：
Wherein, K is optic fiber gyroscope graduation factor.
The accurate measurement method of optical fibre gyro zero bias, includes the following steps：
1) sensitive axes of optical fibre gyro are installed on horizontal base and optical fibre gyro remains stationary state straight up, when
Between the output quantity F of optical fibre gyro is measured in period ti(i=1,2,3 ... n), passes through optical fibre gyro output quantity FiCalculate optical fiber top
The output mean value of spiral shellFormula it is as follows：
Wherein K be optic fiber gyroscope graduation factor, B0For optical fibre gyro zero bias, ΩeFor
Earth rotation angular speed,The latitude local for test；
2) sensitive axes of optical fibre gyro are installed on horizontal base and optical fibre gyro remains stationary state straight down, when
Between period t ' it is interior measure optical fibre gyro output quantity Fi' (i=1,2,3 ... n), passes through optical fibre gyro output quantity Fi' calculating optical fiber
The output mean value of gyroFormula it is as follows：
3) the corresponding earth rate component of local latitude is eliminated after step 1) is added with the formula in step 2), is obtained
Optical fibre gyro zero biasDue to Therefore it obtains
Optical fibre gyro zero bias
In step 1) and step 2), generally there is Geometrical Tolerance Principle to the mounting plane of optical fibre gyro and horizontal base,
Therefore, optical fibre gyro installation error deviation pairWithInfluence it is smaller, meanwhile, optical fibre gyro installation error deviation is opposite
In optical fibre gyro zero bias B0For earth rate component, error deviation value can be neglected, therefore by step 1) and step
2) the accurate optical fibre gyro zero bias B in step 3) is obtained0.Make optical fibre gyro sensitive axes that need not be directed toward thing by this method
To thoroughly influence of the elimination earth rotation to optical fibre gyro reduces dependence of the optical fibre gyro to test condition, be measuring system solution
It calculates and accurate zero reference is provided, test and computational methods are simple and effective, and practical, easily operated, the optical fibre gyro calculated
Zero bias precision is high.
Above-described embodiment, only presently preferred embodiments of the present invention, is not used for limiting the scope of the present invention, therefore all with this
The equivalence changes that content described in invention claim is done should all be included within scope of the invention as claimed.
Claims (2)
1. the accurate measurement method of optical fibre gyro zero bias, it is characterised in that：The light being installed on horizontal base by measuring forward direction
Output of the fine gyro within the t time cycles simultaneously obtains output mean valueThe optical fibre gyro on horizontal base is reversely installed in t '
Output in time cycle simultaneously obtains output mean valueByWithObtain optical fibre gyro zero bias B0Calculation formula it is as follows：
Wherein, K is optic fiber gyroscope graduation factor.
2. the accurate measurement method of optical fibre gyro zero bias according to claim 1, it is characterised in that：Include the following steps：
1) sensitive axes of optical fibre gyro are installed on horizontal base and optical fibre gyro remains stationary state straight up, in week time
The output quantity F of optical fibre gyro is measured in phase ti(i=1,2,3 ... n), passes through optical fibre gyro output quantity FiCalculate optical fibre gyro
Export mean valueFormula it is as follows：
Wherein K be optic fiber gyroscope graduation factor, B0For optical fibre gyro zero bias, ΩeFor the earth
Rotation angular speed,The latitude local for test；
2) sensitive axes of optical fibre gyro are installed on horizontal base and optical fibre gyro remains stationary state straight down, in week time
The interior output quantity F for measuring optical fibre gyro of phase t 'i' (i=1,2,3 ... n), passes through optical fibre gyro output quantity Fi' calculating optical fibre gyro
Output mean valueFormula it is as follows：
3) the corresponding earth rate component of local latitude is eliminated after step 1) is added with the formula in step 2), obtains optical fiber
Gyro zero biasDue to Therefore optical fiber is obtained
Gyro zero bias
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813296A (en) * | 2019-03-24 | 2019-05-28 | 浙江大学 | A kind of angle measurement unit and method for eliminating optic fiber gyroscope graduation factor error |
| CN113267202A (en) * | 2021-04-28 | 2021-08-17 | 广东国天时空科技有限公司 | Optical fiber gyroscope scale factor nonlinear error compensation method |
| CN114061617A (en) * | 2020-08-05 | 2022-02-18 | 上海傲世控制科技股份有限公司 | Non-orthogonal dynamic calibration method for optical fiber gyroscope |
| CN115638807A (en) * | 2022-12-21 | 2023-01-24 | 中国船舶集团有限公司第七〇七研究所 | Optical fiber gyroscope precision testing method based on earth rotation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813296A (en) * | 2019-03-24 | 2019-05-28 | 浙江大学 | A kind of angle measurement unit and method for eliminating optic fiber gyroscope graduation factor error |
| CN109813296B (en) * | 2019-03-24 | 2020-12-15 | 浙江大学 | Angle measuring device and method for eliminating scale factor error of fiber-optic gyroscope |
| CN114061617A (en) * | 2020-08-05 | 2022-02-18 | 上海傲世控制科技股份有限公司 | Non-orthogonal dynamic calibration method for optical fiber gyroscope |
| CN114061617B (en) * | 2020-08-05 | 2024-04-09 | 上海傲世控制科技股份有限公司 | Non-orthogonal dynamic calibration method for fiber-optic gyroscope |
| CN113267202A (en) * | 2021-04-28 | 2021-08-17 | 广东国天时空科技有限公司 | Optical fiber gyroscope scale factor nonlinear error compensation method |
| CN113267202B (en) * | 2021-04-28 | 2024-03-08 | 广东国天时空科技有限公司 | Nonlinear error compensation method for scale factors of fiber-optic gyroscope |
| CN115638807A (en) * | 2022-12-21 | 2023-01-24 | 中国船舶集团有限公司第七〇七研究所 | Optical fiber gyroscope precision testing method based on earth rotation |
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Application publication date: 20180615 |