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Field test method and system for optical fiber inertial group magnetic sensitivity

An on-site test and sensitivity technology, applied in the direction of measuring devices, instruments, Sagnac effect gyroscopes, etc., can solve the problem that the influence of the earth's rotational speed cannot be deducted

Active Publication Date: 2020-10-02
重庆自行者科技有限公司
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AI Technical Summary

Problems solved by technology

[0008] Quantitative analysis of the magnetic field sensitivity of the fiber optic gyroscope can be carried out, but reference equipment such as test turntables is also required, otherwise the influence of the earth's rotational speed cannot be deducted

Method used

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  • Field test method and system for optical fiber inertial group magnetic sensitivity
  • Field test method and system for optical fiber inertial group magnetic sensitivity
  • Field test method and system for optical fiber inertial group magnetic sensitivity

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specific Embodiment 1

[0099] (1) The optical fiber inertial group is placed on the field workbench as a whole, and the workbench is placed in the magnetic field environment of the work site as a whole, so that the axis to be tested is in a roughly horizontal position, and it is powered on and preheated for 5 minutes;

[0100] (2) The fiber-optic inertial group remains static, and the output data of the inertial group fiber-optic gyroscope and accelerometer are collected for inertial navigation calculations. The inertia / zero-speed combination is used for self-alignment calculations, and the Kalman filter is used to estimate the gyroscope zero-bias error. The accurate time is 300s;

[0101] (3) After the self-alignment is completed, it turns into the inertial navigation state, and the manual rotation inertial group rotates about 180 degrees around the celestial axis;

[0102] (4) The fiber-optic inertial group is in static state again, and the output data of the inertial-group fiber optic gyroscope a...

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Abstract

The invention discloses a field test method and system for the magnetic sensitivity of an optical fiber inertial measuring unit. The method comprises the following steps of carrying out self-aligningcalculation on the optical fiber inertial measuring unit, thereby obtaining a first error; manually rotating the optical fiber inertial measuring unit for 180 degrees; carrying out self-aligning calculation on the rotated optical fiber inertial measuring unit based on the first error, thereby obtaining a second error; taking the second error as a reference value; manually rotating the optical fiber inertial measuring unit for 30 degrees every time, carrying out aligning, and recording a zero offset estimation value of a gyroscope after each aligning is completed, wherein the optical fiber inertial measuring unit is rotated for 360 degrees in total; carrying out subtraction on the reference value and the zero offset estimation value of each gyroscope, thereby obtaining a maximum differencevalue; judging whether the maximum difference value is smaller than a gyroscope precision reference threshold value or not; if so, determining that the magnetic sensitivity of the optical fiber inertial measuring unit meets a field requirement; and if not, determining that the magnetic sensitivity of the optical fiber inertial measuring unit does not meet the field requirement. By adopting the method or the system, under the action of a field magnetic field environment, the magnetic sensitivity of the optical fiber inertial measuring unit can be directly tested without depending on any test equipment.

Description

technical field [0001] The invention relates to the field of optical fiber testing, in particular to an on-site testing method and system for optical fiber inertial group magnetic zero sensitivity. Background technique [0002] Fiber optic gyroscope is a new type of gyroscope with the fastest development in the past ten years. Medium and low-precision fiber optic gyroscopes for tactical applications have become mature, and high-precision and ultra-high-precision fiber optic gyroscopes for navigation applications are also gradually developing. [0003] To determine the suitability of a fiber optic gyroscope for a given application environment, it needs to be evaluated and tested to ensure that the gyroscope meets the full performance requirements of the application. There is a national military standard "Fiber Optic Gyroscope Test Method" (GJB2426-95) for reference in relevant test specifications for fiber optic gyroscopes. There are clear definitions and test specifications...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00G01C19/72
CPCG01C19/72G01C25/005
Inventor 祝露峰许文渊任卓恒
Owner 重庆自行者科技有限公司
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