Quick north-finding method based on optical fiber gyroscope

Abstract

The invention discloses a quick north-finding method based on an optical fiber gyroscope, which comprises the following steps of: firstly, adjusting a rotary table, and fixing the optical fiber gyroscope; then, collecting and storing the output sequences of the optical fiber gyroscope at all the positions, obtaining a reverse sequence by reverse storage, and modeling all the sequences by an autoregressive integrated moving average model (ARIMA) (2, 1, 1); establishing a Kalman-stable equation and a measurement equation, carrying out Kalman filtering on all the sequences, and confirming the output of the initial time and the finish time of measurement; and finally, calculating the initial azimuth angle, and realizing quick north-finding based on the optical fiber gyroscope. The quick north-finding method overcomes the influence of zero deviation change for the north-finding accuracy in the starting process of the optical fiber gyroscope, so that the optical fiber gyroscope can be used for finding north after being electrified, the north-finding time can be shortened, and the north-finding accuracy is simultaneously guaranteed.

Description

technical field [0001] The invention relates to a north-seeking method, in particular to a fast north-seeking method based on an optical fiber gyroscope. Background technique [0002] The fiber optic gyroscope is used to measure the angular rate of rotation of the carrier relative to the inertial space, and has the advantages of no moving parts, simple process, and shock resistance. As a sensitive element, fiber optic gyroscope has broad prospects in positioning and orientation applications. [0003] In the north-finding method using the fiber optic gyro as the sensitive element, the multi-position north-seeking method overcomes the shortcomings of dynamic north-seeking, reduces the requirements for north-seeking hardware, and retains the advantages of static north-seeking and dynamic north-seeking. [0004] In the multi-position north-seeking method, the zero-bias is assumed to be approximately constant in the north-seeking solution, which puts forward requirements on the ...

AI Technical Summary

Problems solved by technology

Due to the zero-bias changes caused by the output drift and temperature changes of the optical or electrical components inside the fiber optic gyroscope during the process of reaching thermal equilibrium during startup, the fiber optic gyroscope can only meet the requirements of zero-bias stability after a certain startup time, which will lead to an increase in north-seeking time

Conversely, starting north-seeking within the start-up time can shorten the time for north-seeking, but the error caused by the change of zero offset will reduce the accuracy of north-finding

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