[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.3807/JOSK.2012.16.4.401

Amplitude Control of Phase Modulation for Dithered Closed-loop Fiber Optic Gyroscope

Chong, Kyoung-Ho (Agency for Defense Development)
Chong, Kil-To (Chonbuk National University)
Kim, Young-Chul (Kunsan National University)

Publication Information

Journal of the Optical Society of Korea / v.16, no.4, 2012 , pp. 401-408 More about this Journal

Abstract

The amplitude error of phase modulator used in closed-loop fiber optic gyroscope has occurred by the temperature dependency of the electro-optic coefficient, and also can be due to the square-wave dither signal which is generally applied for eliminating the deadzone. This error can cause bias drift and scale factor error. This paper analyzes the temperature dependency of the modulation amplitude and the relationship with the scale factor of the gyroscope, and deals with an amplitude control method. The error calculation logic considering the dither signal is implemented on the signal processing module. The result of experiments from a prototype gyroscope shows the effect of the modulation amplitude control and a considerable improvement on performances.

Keywords

Phase modulation; Integrated optic circuits; Fiber optic gyroscope;

Citations & Related Records

Reference

1	H. C. Lefevre, "Fundamentals of the interferometric fiber-optic gyroscope," Proc. SPIE 2837, 2-17 (1996).
2	I. R. Edu, R. Obreja, and T. L. Grigorie, "Current technologies and trends in the development of gyros used in navigation applications - a review," in Proc. The 5th WSEAS International Conference on Communications and Information Technology (Stevens Point, Wisconsin, USA, 2011), pp. 63-68.
3	V. C. Lefevre and W. R. Lindberg, "Fiber optic gyroscopes and the accomplishments of the DARPA-sponsored GPS guidance package program," Proc. SPIE 6314, 63140B1-9 (2006).
4	T. Buret, D. Ramecourt, and F. Napolitano, "From space qualified fiber optic gyroscope to generic fiber optic solutions available for space application," in Proc. The 7th International Conference on Space Optics (Toulouse, France, Oct. 2008), pp. 14-17.
5	G. A. Sanders, B. Szafraniec, R. Y. Liu, C. Laskoskie, L. Standjord, and G. Weed, "Fiber optic gyros for space, marine and aviation applications," Proc. SPIE 2837, 61-71 (1996).
6	B. Moslehi, R. Yahalom, L. Oblea, F. Faridian, R. Black, J. Ha, and M. Berarducci, "Low-cost and compact fiber-optic gyroscope with long-term stability," in Proc. IEEE Aerospace Conference (Big Sky, Montana, USA, 2011), pp. 1-9.
7	J. P. Salvestrini, L. Guilbert, M. Fontana, M. Abarkan, and S. Gille, "Analysis and control of the DC drift in LiNb $O_{3}$ - based Mach-Zehnder modulators," J. Lightwave Technol. 2, 1522-1534 (2011).
8	J. D. Zook, D. Chen, and G. N. Otto, "Temperature dependence and model of the electro-optic effect in $LiNbO_{3}$ ," Appl. Phys. Lett. 11, 159-161 (1967). DOI
9	L. M. Johnson, F. J. Leonberger, and G. W. Pratt, "Integrated optical temperature sensor," Appl. Phys. Lett. 41, 134-136 (1982). DOI
10	H. Y. Shen, H. Xu, Z. D. Zeng, W. X. Lin, R. F. Wu, and G. F. Xu, "Measurement of refractive indices and thermal refractive-index coefficients of $LiNbO_{3}$ crystal doped with 5 mol. % MgO," Appl. Opt. 31, 6695-6697 (1992). DOI
11	F. Sun, L. Wang, and G. Wang, "Study on the drift of modulated phase in interference fiber optic gyroscope," Journal of Computers 5, 394-400 (2010).
12	G. A. Pavlath, "Closed-loop fiber optic gyros," Proc. SPIE 2837, 46-60 (1996).
13	R. A. Kovacs, "Fiber optic gyroscope with reduced nonlinearity at low angular rates," in Proc. 21st Annual AAS Guidance and Control Conference (Boston, MA, USA, 1998), AAS 98-043.
14	G. Spahlinger, M. Kemmler, M. Ruf, M. Ribes, and S. Zimmermann, "Error compensation via signal correlation in high precision closed-loop fiber optic gyros," Proc. SPIE 2837, 218-227 (1996).