Instrumentation, Techniques, and Measurement

Identifying Z-axis gyro drift and scale factor error using azimuth measurement in fiber optic gyroscope single-axis rotation inertial navigation system

[+] Author Affiliations
Lingcao Wang, Lei Wang, Jiaxin Gao

Beihang University, School of Instrumentation Science and Opto-electronics Engineering, Haidian District, Beijing, China

Kui Li

Beihang University, School of Instrumentation Science and Opto-electronics Engineering, Haidian District, Beijing, China

Xi’an Research Institute of Surveying and Mapping, State Key Laboratory of Geo-information Engineering, Xi’an, China

Opt. Eng. 56(2), 024102 (Feb 03, 2017). doi:10.1117/1.OE.56.2.024102
History: Received October 11, 2016; Accepted January 12, 2017
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Abstract.  In the fiber optic gyroscope (FOG) single-axis rotation inertial navigation system (SRINS), the Z-axis gyro drift (ϵz) dramatically limits its navigation precision and the Z-axis gyro scale factor error (δKGz) can cause greater navigation error because of the rotation process compared with the strap-down inertial navigation system. Hence, identification and compensation for the ϵz and δKGz 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 ϵz and δKGz. Compared with the traditional method, which takes velocity and position errors as measurements, the time required for identifying ϵz 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 ϵz reaches 0.002°/h and that of the δKGz reaches 8 ppm in 10 min. The positioning accuracy of the SRINS improves greatly after the identification and compensation.

© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Lingcao Wang ; Kui Li ; Lei Wang and Jiaxin Gao
"Identifying Z-axis gyro drift and scale factor error using azimuth measurement in fiber optic gyroscope single-axis rotation inertial navigation system", Opt. Eng. 56(2), 024102 (Feb 03, 2017). ; http://dx.doi.org/10.1117/1.OE.56.2.024102


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