Electrical crosstalk-coupling measurement and analysis for digital closed loop fibre optic gyro

doi:10.1088/1674-1056/19/3/030701

Abstract The phase modulation and the closed-loop controller can generate electrical crosstalk-coupling in digital closed-loop fibre optic gyro. Four electrical cross-coupling paths are verified by the open-loop testing approach. It is found the variation of ramp amplitude will lead to the alternation of gyro bias. The amplitude and the phase parameters of the electrical crosstalk signal are measured by lock-in amplifier, and the variation of gyro bias is confirmed to be caused by the alternation of phase according to the amplitude of the ramp. A digital closed-loop fibre optic gyro electrical crosstalk-coupling model is built by approximating the electrical cross-coupling paths as a proportion and integration segment. The results of simulation and experiment show that the modulation signal electrical crosstalk-coupling can cause the dead zone of the gyro when a small angular velocity is inputted, and it could also lead to a periodic vibration of the bias error of the gyro when a large angular velocity is inputted.

Keywords: fibre optic gyro electrical crosstalk-coupling open loop testing correlation detection

Received: 07 May 2009
Revised: 04 August 2009
Accepted manuscript online:

PACS:	42.81.Pa	(Sensors, gyros)
	42.79.Hp	(Optical processors, correlators, and modulators)
	42.30.-d	(Imaging and optical processing)

Fund: Project supported by the National High Technology Research and Development Program of China (Grant No.~2007AA04Z436).

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Jin Jing(金靖)$†$, Tian Hai-Ting(田海亭), Pan Xiong(潘雄), and Song Ning-Fang(宋凝芳) Electrical crosstalk-coupling measurement and analysis for digital closed loop fibre optic gyro 2010 Chin. Phys. B 19 030701

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Electrical crosstalk-coupling measurement and analysis for digital closed loop fibre optic gyro

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