A temperature drift compensation method applied to fiber optic gyroscope north-seeking

Luo Jinhui; Zhou Yilan; Liu Cheng; Shu Xiaowu

doi:10.12086/oee.2020.190681

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Luo J H, Zhou Y L, Liu C, et al. A temperature drift compensation method applied to fiber optic gyroscope north-seeking[J]. Opto-Electron Eng, 2020, 47(11): 190681. doi: 10.12086/oee.2020.190681

Citation:

Luo J H, Zhou Y L, Liu C, et al. A temperature drift compensation method applied to fiber optic gyroscope north-seeking[J]. Opto-Electron Eng, 2020, 47(11): 190681. doi: 10.12086/oee.2020.190681

A temperature drift compensation method applied to fiber optic gyroscope north-seeking

College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China

Fund Project: Supported by National Natural Science Foundation of China (61203190)

More Information

Corresponding author: Luo Jinhui, E-mail: 21730064@zju.edu.cn

Received Date 10 November 2019

Revised Date 21 January 2020

Published Date 15 November 2020

Abstract

Abstract

The startup error of fiber optic gyroscope (FOG) in north-seeking is the error caused by the zero-bias drift of FOG caused by drastic change of the temperature in the starting process. The start-up error significantly increases north-seeking error during the cold startup phase compared to the stable phase, which prolongs the effective north-seeking time. Through the analysis of the factors affecting the temperature drift of FOG, the multi-parameter linear model was established by empirical mode decomposition (EMD), autoregressive-moving average (ARMA) modeling and Kalman filtering to realize a temperature drift compensation method applied to FOG north-seeking. The experimental results show that the method can reduce the north-seeking startup error by nearly 80%, so that the startup north-seeking precision is equivalent to the stable phase and the effective north-seeking time is shortened.
- fiber optic gyroscope (FOG) /
- north-seeking /
- temperature drift /
- temperature compensation

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References

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Overview

Overview

Overview: The north-seeking orientation technology has wide range of applications in many fields. In the military domain, missiles, rockets, artillery, etc. cannot be launched without direction datum. Aerospace, tanks, ships, etc. cannot work without direction datum. In the civilian domain, mineral exploration, mining, geotechnical engineering, and civil engineering construction also require direction datum. Therefore, the research on north-seeking orientation technology is of great significance for realizing national defense modernization and promoting national economic development.
Fiber optical gyroscope (FOG) is an all-solid-state gyroscope based on Sagnac effect. It has the advantages of high impact resistance, high sensitivity, long life, low power consumption, and reliable integration. It is especially suitable for north-seeking orientation system. However, since the main components of FOG are sensitive to temperature, when the temperature changes, non-reciprocal phase errors will occur in the output signal of FOG, resulting in instability of the zero drift of FOG, and ultimately affecting FOG's accuracy under different temperature conditions. Therefore, the change of temperature during the startup of FOG leads to the phenomenon that the output data of FOG has a large temperature drift after power-on, and then gradually becomes stable. This startup characteristic causes FOG north-seeking startup drift, and north-seeking startup error during the cold start, which is manifested by a significant increase in the north-seeking error during the cold start and actually prolongs the effective north-seeking time.
The method for suppressing the temperature drift of the FOG generally adopts methods of improving the structure and components of the fiber gyro, improving the fiber winding technology, and controlling the temperature of FOG. But suppressing the temperature drift from the mechanism, especially for the medium and low precision FOG with small volume is very difficult. However, the temperature drift modeling compensation is a relatively simple and quick solution, and can basically meet the work requirements. Through the analysis of the factors affecting the temperature drift of FOG, the multi-parameter linear model was established by empirical mode decomposition (EMD), autoregressive-moving average (ARMA) modeling, and Kalman filtering to realize a temperature drift compensation method applied to FOG north-seeking. The experimental results show that the method can reduce the north-seeking startup error by nearly 80%, so that the startup north-seeking precision is equivalent to the stable phase and the effective north-seeking time is shortened.