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

Lingcao Wang; Kui Li; Lei Wang; Jiaxin Gao

doi:10.1117/1.OE.56.2.024102

3 February 2017 Identifying Ζ-axis gyro drift and scale factor error using azimuth measurement in fiber optic gyroscope single-axis rotation inertial navigation system

Lingcao Wang, Kui Li, Lei Wang, Jiaxin Gao

Author Affiliations +

Funded by: Aeronautical Science Foundation of China, Fund of BUAA for Graduate Innovation and Practice, BUAA for Graduate Innovation Practice

Optical Engineering, Vol. 56, Issue 2, 024102 (February 2017). https://doi.org/10.1117/1.OE.56.2.024102

Abstract

In the fiber optic gyroscope (FOG) single-axis rotation inertial navigation system (SRINS), the <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:mi<Z</mml:mi< </mml:mrow< </mml:math< </inline-formula<-axis gyro drift (<inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:msub< <mml:mi<ϵ</mml:mi< <mml:mi<z</mml:mi< </mml:msub< </mml:mrow< </mml:math< </inline-formula<) dramatically limits its navigation precision and the <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:mi<Z</mml:mi< </mml:mrow< </mml:math< </inline-formula<-axis gyro scale factor error (<inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:mi<δ</mml:mi< <mml:msub< <mml:mi<K</mml:mi< <mml:mrow< <mml:mi<G</mml:mi< <mml:mi<z</mml:mi< </mml:mrow< </mml:msub< </mml:mrow< </mml:math< </inline-formula<) can cause greater navigation error because of the rotation process compared with the strap-down inertial navigation system. Hence, identification and compensation for the <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:msub< <mml:mi<ϵ</mml:mi< <mml:mi<z</mml:mi< </mml:msub< </mml:mrow< </mml:math< </inline-formula< and <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:mi<δ</mml:mi< <mml:msub< <mml:mi<K</mml:mi< <mml:mrow< <mml:mi<G</mml:mi< <mml:mi<z</mml:mi< </mml:mrow< </mml:msub< </mml:mrow< </mml:math< </inline-formula< 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 <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:msub< <mml:mi<ϵ</mml:mi< <mml:mi<z</mml:mi< </mml:msub< </mml:mrow< </mml:math< </inline-formula< and <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:mi<δ</mml:mi< <mml:msub< <mml:mi<K</mml:mi< <mml:mrow< <mml:mi<G</mml:mi< <mml:mi<z</mml:mi< </mml:mrow< </mml:msub< </mml:mrow< </mml:math< </inline-formula<. Compared with the traditional method, which takes velocity and position errors as measurements, the time required for identifying <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:msub< <mml:mi<ϵ</mml:mi< <mml:mi<z</mml:mi< </mml:msub< </mml:mrow< </mml:math< </inline-formula< 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 <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:msub< <mml:mi<ϵ</mml:mi< <mml:mi<z</mml:mi< </mml:msub< </mml:mrow< </mml:math< </inline-formula< reaches 0.002°/h and that of the <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:mi<δ</mml:mi< <mml:msub< <mml:mi<K</mml:mi< <mml:mrow< <mml:mi<G</mml:mi< <mml:mi<z</mml:mi< </mml:mrow< </mml:msub< </mml:mrow<

Citation Download Citation

Lingcao Wang, Kui Li, Lei Wang, and Jiaxin Gao "Identifying Ζ-axis gyro drift and scale factor error using azimuth measurement in fiber optic gyroscope single-axis rotation inertial navigation system," Optical Engineering 56(2), 024102 (3 February 2017). https://doi.org/10.1117/1.OE.56.2.024102

Received: 11 October 2016; Accepted: 12 January 2017; Published: 3 February 2017

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