Method for improving precision of fiber optic gyroscope (FOG) north-seeker

A technology of fiber optic gyroscope and north finder, which is applied to Sagnac effect gyroscopes, instruments, and navigation through velocity/acceleration measurement, which can solve the problems of ensuring the parallelism of sensitive axes, ensuring the misalignment angle of sensitive axes, and Difficulty and other issues

Inactive Publication Date: 2012-10-17
ZHEJIANG UNIV
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Problems solved by technology

[0015] It can be seen that the traditional method has the following defects: (1) It cannot completely eliminate the rotation angle error and the rotation axis azimuth error of the indexing mechanism
(3) The components and mechanisms of the north finder are required to be processe

Method used

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  • Method for improving precision of fiber optic gyroscope (FOG) north-seeker
  • Method for improving precision of fiber optic gyroscope (FOG) north-seeker
  • Method for improving precision of fiber optic gyroscope (FOG) north-seeker

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with drawings and embodiments.

[0064] A method for improving the accuracy of a fiber optic gyro north finder, such as figure 2 As shown, the principle is to calibrate the north finder first. During the calibration process, the indexing mechanism is required to turn to each position where it needs to stay when seeking north. Every time a position is reached, the fiber optic gyroscope and accelerometer are calibrated at this position, so as to obtain the installation error E of the fiber optic gyroscope at this position XFi ,E YFi ,E ZFi and the installation error E of the accelerometer XAi ,E YAi ,E ZAi , where i represents the position ordinal number of the four positions, i=1~4. During the calibration process, the scaling factor K of the fiber optic gyroscope is obtained at the same time F and the scale factor K of the accelerometer A . The important significance of the calibration is that...

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Abstract

The invention discloses a method for improving precision of a fiber optic gyroscope (FOG) north-seeker, comprising the following steps of: calibrating the north-seeker to obtain calibration factor and installation error of FOG and an accelerometer; carrying out four-position data acquisition and pretreatment based on system installation error calibration, and then calculating axial acceleration of a base system to obtain pitch angle and roll angle of the north-seeker; and calculating and determining axial angular velocity of the base system to finally obtain azimuth angle of the north-seeker. By the adoption of the method, north-seeking errors caused by rotating errors and rotating shaft orientation errors of an indexing mechanism are eliminated; north-seeking errors caused by installation errors of FOG and the accelerometer are eliminated; technological requirements of the north-seeker are reduced; there is no need to eliminate installation errors from the aspect of technology; it is unnecessary for the four positions rotated by the indexing mechanism to be strictly orthogonal each other; and the north-seeking precision of the FOG north-seeker under all-attitude state is improved.

Description

technical field [0001] The invention relates to the fields of navigation, guidance and control, in particular to a method for improving the precision of an optical fiber gyro north finder. Background technique [0002] In the fields of military applications and engineering surveys, such as missile launch systems, ground radar systems, tunnel construction, etc., there is a demand for autonomous orientation. As a precision inertial measurement instrument, the gyro north finder plays a vital role in precise orientation, improving the precision of military systems and engineering efficiency. [0003] Fiber optic gyroscope is a kind of all-solid-state gyroscope, which has the characteristics of stable impact resistance, short start-up time, wide temperature range, small size, light weight, low power consumption, etc. It has very obvious advantages over mechanical gyroscopes. Therefore, the north finder using the fiber optic gyroscope has a higher degree of miniaturization, lower...

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Application Information

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IPC IPC(8): G01C19/72G01C21/16G01C25/00
Inventor 楼奇哲周一览杨建华刘承
Owner ZHEJIANG UNIV
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