Quadratic overload term test method for flexible gyroscope based on optical fiber monitoring and centrifuge with two-axis turntable

Abstract

The invention discloses a quadratic overload term test method for a flexible gyroscope based on optical fiber monitoring and a centrifuge with a two-axis turntable, which belongs to the technical field of inertia. The test method includes the steps: firstly, mounting an optical fiber gyroscope and the flexible gyroscope on the centrifuge with the two-axis turntable, electrifying the flexible gyroscope and the optical fiber gyroscope and acquiring static output data after preheating stabilization; secondly, synchronously rotating the centrifuge along with an outer turntable and an inner turntable of the two-axis follow-up turntable and acquiring overload output data after rotation speed stabilization; and finally, calculating secondary overload term coefficient. The test method has the advantages that the relationship between a quadratic term of a specific force-sensitive error and environmental overload acceleration in a static drift model of the flexible gyroscope can be calibrated, a quadratic polynomial model of specific force-sensitive error terms can be established, and a test scheme is provided for calculating and determining the influence of nonlinear errors of the flexible gyroscope on system errors.

Description

technical field [0001] The invention belongs to the technical field of inertia, and in particular relates to a method for testing the secondary overload item of a flexible gyroscope based on optical fiber monitoring and a two-axis turntable centrifuge. Background technique [0002] The flexible gyroscope is a mechanical two-degree-of-freedom gyroscope. The motor shaft of its driving motor drives the rotor to rotate at high speed through a flexible joint, such as figure 1 As shown, the flexible joint includes two pairs of mutually orthogonal flexible connection shafts and a balance ring. Since its inception, flexible gyroscopes have been widely used in various navigation, guidance and control systems. [0003] In practical applications, there are drift errors in the angular velocity measurement value of the flexible gyroscope due to various internal and external factors, generally composed of static drift error, dynamic drift error and random drift error, among which the lin...

AI Technical Summary

Problems solved by technology

[0018] The optimal 24-position calibration method described above is essentially the same as the traditional static multi-position test method. It can only use the gravitational field as the environmental overload excitation. Although the effect is better than that of the 8-position, the obtained results can only be expressed in a 1g environment. , the accurate value of the calibration coefficient cannot be obtained in a large overload environment exceeding 1g

In an environment that does not exceed 1g, it is actually difficult to effectively distinguish the quadratic related items of acceleration from device noise, so the reliability of the results is not high

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