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Volume 32 Issue 02
Feb.  2006
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Journal of Beijing University of Aeronautics and Astronautics  > 2006  >  32(02): 195-198.
Zhang Yanshun, Wang Yue. New method of continuous well trajectory measurement[J]. Journal of Beijing University of Aeronautics and Astronautics, 2010, 36(2): 210-213. (in Chinese)
Citation: Zhang Xi, Pan Xiong. Theory analysis and experiment of random modulation in FOG[J]. Journal of Beijing University of Aeronautics and Astronautics, 2006, 32(02): 195-198. (in Chinese)
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Theory analysis and experiment of random modulation in FOG

  • School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 17 Dec 2004
  • Publish Date: 28 Feb 2006
    Abstract
  • Bias stability is an important performance of gyro. But in digital closed loop fiber optical gyro(FOG), it is influenced extremely by the electrical crosstalk in the electronics. Output drift can be reduced by using random modulation.The crosstalk of square wave modulation and random modulation was analyzed through fast Fourier transformation(FFT). When square wave modulation is used, the crosstalk result has the same square wave frequency with the photodetector analog output. So it can not be filtered in the gyro electronic and bias error arises in output. Further more , it causes the output dependence on the light intensity. When random modulation is used, the crosstalk result has different frequency with the photodetector analog output, so the output of FOG has more stablity. The random modulation point is -3π/2,-π/2,π/2,3π/2, which is the most sensitive point. The modulation wave has even harmonious of square wave frequency. Experimental results indicate that bias error can be restrained and the bias stability of output increased when random modulation is used in digital closed loop FOG.

     

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  • [1] Cordova A, Patterson R A, Rahn J, et al. Progress in navigation-grade IFOG performance . In:Rric Udd, Lefèvre H C, Kazuo Hotate, eds. Fiber Optic Gyros:20th Anniversary Conference . Denver:SPIE, 1996. 207~217 [2] Spahlinger G. Error compensation via signal correlation in high-precision closed-loop fiber optic gyros . In:Rric Udd, Lefèvre H C, Kazuo Hotate, eds. Fiber Optic Gyros:20th Anniversary Conference .Denver:SPIE, 1996. 218~228 [3] Lefèvre H C. The fiber-optic gyroscope[M] London:ARTECH HOUSE, 1993 [4] 胡广书. 数字信号处理——理论、算法与实现[M] 北京:清华大学出版社,1997 Hu Guangshu.Digital signal processing:theory, arithmetic and realization .Beijing:Tsinghua University Press,1997(in Chinese) [5] Vinay K I, John G P. Digital signal processing using MATLAB[M] Beijing:Science Press, 2003 [6] Paulo S R D, Eduardo A B D, Silva S L N. Digital signal processing-system analysis and design[M] Beijing:Pub House of Electronic Industry, 2002 [7] Sanders S J, Strandjord L K. Fiber optic gyro technology trends—a Honeywell perspective[J] Optical Fiber Sensors Conference Technical Digest, 2002,1:5~8
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