Magnetic shielding device for biaxial-rotation fibre-optic inertial navigation system

Abstract

The invention belongs to the technical field of inertial navigation systems, and particularly relates to a magnetic shielding device for a biaxial-rotation fibre-optic inertial navigation system. The magnetic shielding device for the biaxial-rotation fibre-optic inertial navigation system disclosed by the invention comprises a gyroscope shielding layer and an outer shielding layer, wherein the gyroscope shielding layer is used for directly shielding an fibre-optic gyroscope and is installed on an installation surface corresponding to an inertial assembly together with the fibre-optic gyroscope; the whole inertial assembly is surrounded by the outer shielding layer to form a double-layer magnetic shielding structure. The magnetic shielding device disclosed by the invention is capable of effectively isolating the motor magnetic field in the inertial navigation system, and realizing magnetic shielding protection on the rotating inertial assembly, thus reducing the magnetic field intensity around the fibre-optic gyroscope, and improving the navigation accuracy of the inertial navigation system.

Description

technical field [0001] The invention belongs to the technical field of inertial navigation systems, and in particular relates to a magnetic shielding device for a dual-axis rotating optical fiber inertial navigation system. Background technique [0002] Due to the magneto-optical Faraday effect, the accuracy indicators of inertial devices such as fiber optic gyroscopes are greatly affected by the magnetic field. Therefore, for higher precision fiber optic inertial navigation systems, it is necessary to design a suitable magnetic shielding device. In order to ensure the best shielding effect, the shielding device can be equipped with multiple layers according to the needs, and each layer of shielding device should try to ensure the continuous structure and the smallest pores. [0003] The dual-axis rotation modulation technology is to fix the inertial component on the rotating mechanism, and drive the inertial component to reciprocate around two mutually orthogonal axes by a ...

AI Technical Summary

Problems solved by technology

However, due to the influence of the strong magnet in the motor, the magnetic field strength around the inertial component is increased by dozens of times relative to the earth's magnetism, and it will continue to change with its rotation. Accuracy makes a big difference

[0004] The magnetic shielding device often used in the inertial navigation system is generally fixed on the inner wall of the system, and cannot isolate the motor magnetic field inside the system. Therefore, a new magnetic shielding device that can isolate the magnetic field source and the inertial component must be designed.

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