Continuous rotation type north-seeking method based on fiber-optic gyroscope

Abstract

The invention discloses a continuous rotation type north-seeking method based on a fiber-optic gyroscope. According to the method, firstly, the rotating speed of a rotating table is determined, and the effective signal frequency of the fiber-optic gyroscope is calculated; an FIR low-pass digital filter is designed according to the doubled frequency of the effective signal to obtain a filter factor; then, the rotating table rotates at a uniform speed at a certain rotating speed; the output data of the fiber-optic gyroscope and the corresponding angle value of the rotating table are synchronously collected, and the output data of the fiber-optic gyroscope is subjected to real-time digital filtering; when the collected data reach the specific amount, an initial estimation parameter matrix is obtained through a least squares algorithm; then, the subsequently collected fiber-optic gyroscope data are combined with the initial estimation parameter matrix for recursive least square resolving to obtain a north-seeking azimuth angle until the north-seeking is completed. The continuous rotation type north-seeking method adopts the low-pass digital real-time filtering and the recursive least square algorithm, the colored noise of the fiber-optic gyroscope can be filtered away in real time for improving the north-seeking precision, and in addition, the north-seeking azimuth angle can be fast resolved.

Description

technical field [0001] The invention relates to a north-seeking method, in particular to a continuous rotation north-seeking method based on an optical fiber gyroscope. Background technique [0002] The fiber optic gyroscope is an angular rate sensor based on the Sagnac effect, which has the advantages of all-solid-state structure, good reliability, anti-shock and vibration, and high dynamic range. North-seeking orientation is one of the important applications of fiber optic gyro. The north-finder based on fiber optic gyro does not depend on external information, does not radiate energy outward, and is not disturbed by external environments such as terrain and climate. It can seek north around the clock. It plays an important role in military fields such as aviation, aerospace and navigation, as well as civilian fields such as geophysical exploration, geodesy, underground exploration and tunnel excavation. [0003] The north-seeking accuracy of the fiber optic gyroscope mai...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it cannot eliminate the colored noise in the fiber optic gyroscope signal, and the amount of data calculation is large, the calculation speed is slow, and the requirements for the system hardware are high.

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