NDLI: What is MEMS Gyrocompassing? Comparative Analysis of Maytagging and Carouseling

Content Provider	IEEE Xplore Digital Library
Author	Prikhodko, I.P. Zotov, S.A. Trusov, A.A. Shkel, A.M.
Copyright Year	1992
Abstract	North-finding based on micromachined gyroscopes is an attractive possibility. This paper analyzes north-finding methods and demonstrates a measured 4 mrad standard deviation azimuth uncertainty using an in-house developed vibratory silicon MEMS quadruple mass gyroscope (QMG). We instrumented a vacuum packaged QMG with isotropic Q-factor of 1.2 million and Allan deviation bias instability of 0.2 ^°/hr for azimuth detection by measuring the earth's rotation. Continuous rotation (“carouseling”) produced azimuth datapoints with uncertainty diminishing as the square root of the number of turns. Integration of 100 datapoints with normally distributed errors reduced uncertainty to 4 mrad, beyond the noise of current QMG instrumentation. We also implemented self-calibration methods, including in-situ temperature sensing and discrete ±180^° turning (“maytagging” or two-point gyrocompassing) as potential alternatives to carouseling. While both mechanizations produced similar azimuth uncertainty, we conclude that carouseling is more advantageous as it is robust to bias, scale-factor, and temperature drifts, although it requires a rotary platform providing continuous rotation. Maytagging, on the other hand, can be implemented using a simple turn table, but requires calibration due to temperature-induced drifts.
Sponsorship	IEEE Electron Devices Society American Society of Mechanical Engineering (ASME)
Starting Page	1257
Ending Page	1266
Page Count	10
File Size	2793210
File Format	PDF
ISSN	10577157
Volume Number	22
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gyroscopes Azimuth Noise Temperature measurement Earth Sensors Uncertainty maytagging MEMS gyroscope gyrocompassing north-finding azimuth seeking heading carouseling
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Electrical and Electronic Engineering

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What is MEMS Gyrocompassing? Comparative Analysis of Maytagging and Carouseling

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