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Misalignment evaluating method for optical fibre gyro input axis

A technology of fiber optic gyroscope and evaluation method, which is applied to Sagnac effect gyroscopes, instruments, measuring devices, etc., can solve the problems of inability to quickly evaluate the misalignment angle of fiber optic gyroscopes, test methods, and test tooling complexity, etc. To achieve the effect of short test time, simple operation and elimination of installation errors

Inactive Publication Date: 2009-08-19
ZHEJIANG UNIV
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Problems solved by technology

[0016] Chinese patent CN200610011560.2 proposes a precise decoupling test method for gyroscope scale factor and input axis misalignment angle, but its test method and test tooling are relatively complicated, and cannot quickly evaluate the misalignment angle of fiber optic gyroscope

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  • Misalignment evaluating method for optical fibre gyro input axis
  • Misalignment evaluating method for optical fibre gyro input axis
  • Misalignment evaluating method for optical fibre gyro input axis

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Embodiment Construction

[0034] The purpose and effects of the present invention will become more apparent by describing the present invention in detail below with reference to the accompanying drawings.

[0035] This test method is divided into two parts: turntable test and data processing. In this test method, the axis of the fiber optic gyroscope is specified as follows: the OZ axis coincides with the IRA, the OX axis and the OY axis are perpendicular to each other in the installation plane of the fiber optic gyroscope and form a right-handed rectangular coordinate system together with the OZ axis, as shown in figure 1 shown.

[0036] This test method can use a three-axis turntable, or a single-axis rate turntable with a hexahedron tooling. The gyroscope is installed in the tooling on the test turntable, and the positioning accuracy is guaranteed by the accuracy of the turntable and the tooling. When using a single-axis rate turntable for testing, use a hexahedron tooling to install the fiber opt...

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Abstract

The invention discloses a method for evaluating the input axis misalignment angle of an optical fiber gyroscope. The optical fiber gyroscope is mounted on a rate rotary table. The method comprises the following steps: Firstly, the OZ axis of the gyroscope is caused to be parallel to the rotation axis of the rotary table, the average value of the gyroscope output is sequentially tested and recorded with a given input angle rate when the rotary table rotates within single-circle time in positive rotation and reverse rotation; then the minus OZ, plus or minus OX and plus or minus OY axes of the optical fiber gyroscope are caused to be parallel to the rotation axis of the rotary table, the testing process above is repeated. By processing all the six groups of data, the value of the input axis misalignment angle of the optical fiber gyroscope is accurately calculated. The method is simple in operation and short in testing time and simultaneously ensures the correctness and accuracy of the test value.

Description

technical field [0001] The invention relates to the fields of navigation, guidance and control, in particular to an efficient method for evaluating the misalignment angle of an input axis of a fiber optic gyroscope. Background technique [0002] The fiber optic gyroscope input axis (IA) refers to the axis perpendicular to the equivalent plane of the fiber optic loop. When the fiber optic gyroscope has a rotation angular velocity input around the axis, an output signal of the input angular velocity of the fiber optic ring relative to the inertial space is generated. The FOG Input Reference Axis (IRA) is the axis perpendicular to the FOG mounting surface and nominally parallel to the input axis. The misalignment angle of the input axis of the fiber optic gyroscope refers to the angle between the input axis and the input reference axis. Usually, the OZ axis of the fiber optic gyroscope coincides with the IRA, the OX axis and the OY axis are perpendicular to each other in the ...

Claims

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Application Information

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IPC IPC(8): G01C25/00G01C19/72
Inventor 周一览胡慧珠舒晓武刘承
Owner ZHEJIANG UNIV
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