Bias compensation in differential coriolis vibratory gyro

V. V. Chikovani, H. V. Tsiruk

Abstract

This work presets one of the ways to compensate for the bias in differential mode of Coriolis vibratory gyro operation. To compensate for the bias it is necessary to know both channels scale factors, SFx and SFy of differential Coriolis vibratory gyro, which, as a rule, are known by the results of calibration procedure and elastic wave angle  relative to one of the two drive axes which can be established in advance. This paper presents the different variants of bias compensation algorithms which can be applied to compensate for initial gyro bias and bias drift in motion. Experimental results on differential Coriolis vibratory gyro key parameters temperature influence are also presented

Keywords

differential Coriolis vibratory gyro; bias; standing wave angle; phases difference

References

Chikovani, V. V; Umakhanov, E. O. and Marusyk, P. I. “The compensated differential CVG,” in Proc. Gyro Technology: Symposium, 16–17 September 2008, Karlsruhe, Germany, pp. 3.1–3.8.

Chikovani, V. V.; Tsiruk, H. V. “Viratory gyro accuracy parameters improving by means of excitation control.” Elelectronics and Control Systems, NAU, Kyiv, no. 3 (37), 2013, pp. 43–48.

Lynch, D. D. “Coriolis vibratory gyros,” in Proc. Gyro Technology Simposium, 21–23 September, 1998, Stuttgart, Germany, pp. 3.1–3.14.

Hopcroft, M. A.; Kim, B.; Chandorkar, S. and others “Using the temperature dependence of resonator quality factor as a termometer.” Aplied physics letters, vol. 91, issue 1, July 2007.

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