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Four-axis fiber optic gyroscope and its north-seeking method

A fiber-optic gyroscope and fiber-optic ring technology is applied in inertial navigation and related fields to achieve the effects of improving north-seeking accuracy, avoiding indexing time and indexing error, and reducing north-seeking time.

Inactive Publication Date: 2018-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problems caused by the transposition process in the four-position north-seeking scheme, the present invention provides a four-axis fiber optic gyroscope and its north-seeking method, which realizes the simultaneous completion of signal acquisition in four axes at intervals of 90°, and then directly solves In the way of calculating the north azimuth, the north-seeking instrument of the present invention no longer needs an indexing mechanism, which can effectively reduce the time for north-finding and improve the accuracy of north-finding

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  • Four-axis fiber optic gyroscope and its north-seeking method
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  • Four-axis fiber optic gyroscope and its north-seeking method

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Embodiment Construction

[0033] 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.

[0034] figure 1 Shown is the internal structure of a traditional fiber optic gyroscope. The light emitted by the light source passes through the 2×2 coupler and the Y waveguide modulator to form two beams of light facing each other clockwise and counterclockwise in the fiber ring. After the interference light intensity is collected by the detector, it is sent to the signal processing module, and the output result of the signal processing module is proportional to the angular rate of the fiber optic gyroscope.

[0035] Such as figure 2 As shown, the present invention includes a light source 1, a 1×4 fiber coupler 2, a first 2×2 fiber coupler 3, a second 2×2 fiber coupler 4, a third 2×2 fiber coupler 5, a fourth 2 ×2 fiber optic coupler 6, first Y waveguide modulator 7, second Y waveguide modulator...

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Abstract

The invention discloses a four-axis optical fiber gyro and a north finding method thereof and belongs to inertial navigation and relevant fields thereof. According to the four-axis optical fiber gyro for north finding, four optical fiber rings in the horizontal and axial direction with 90-degree angles formed in between sense four axial rotational angular velocity components of the earth at the same time, so that north information can be directly output, an indexing mechanism required by a traditional north finder is not needed any more, north finding time can be effectively reduced, and north finding precision can be improved.

Description

technical field [0001] The invention relates to inertial navigation and related fields, in particular to a four-axis optical fiber gyroscope and a north-seeking method thereof. Background technique [0002] The fiber optic gyro north finder is a fast orientation device for measuring the north azimuth. It has the characteristics of high precision, long life and simple structure. It is widely used for the initial azimuth aiming of tanks or weapons. [0003] The fiber optic gyro used in the fiber optic gyro north finder is a sensor sensitive to angular rate, and its principle is a fiber optic interferometer based on the optical Sagnac effect. The optical path structure of the traditional fiber optic gyroscope is as follows: figure 1 As shown, when rotation occurs, the internal annular interference optical path will produce a Sagnac phase shift proportional to the rotation angular rate, and the Sagnac phase shift φ sag The relationship with the rotation rate of the system is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/728
Inventor 周一览陈贤杨建华舒晓武
Owner ZHEJIANG UNIV