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Optical Engineering

Identifying Z -axis gyro drift and scale factor error using azimuth measurement in fiber optic gyroscope single-axis rotation inertial navigation system
Author(s): Lingcao Wang; Kui Li; Lei Wang; Jiaxin Gao
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Paper Abstract

In the fiber optic gyroscope (FOG) single-axis rotation inertial navigation system (SRINS), the Z -axis gyro drift ( ϵ z ) dramatically limits its navigation precision and the Z -axis gyro scale factor error ( δ K G z ) can cause greater navigation error because of the rotation process compared with the strap-down inertial navigation system. Hence, identification and compensation for the ϵ z and δ K G z are important in SRINS. An approach based on the azimuth error model of open-loop algorithm is proposed. This approach considers azimuth angle as a measurement and uses a least recursive square algorithm for identifying the ϵ z and δ K G z . Compared with the traditional method, which takes velocity and position errors as measurements, the time required for identifying ϵ z with the proposed method is only approximately 10 min, while the traditional method requires 6 h to 12 h. Experimental results from an SRINS with FOGs demonstrate that the accuracy of identifying the ϵ z reaches 0.002°/h and that of the δ K G z

Paper Details

Date Published: 3 February 2017
PDF: 10 pages
Opt. Eng. 56(2) 024102 doi: 10.1117/1.OE.56.2.024102
Published in: Optical Engineering Volume 56, Issue 2
Show Author Affiliations
Lingcao Wang, BeiHang Univ. (China)
Kui Li, BeiHang Univ. (China)
Xi’an Research Institute of Surveying and Mapping (China)
Lei Wang, BeiHang Univ. (China)
Jiaxin Gao, BeiHang Univ. (China)

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