Cover: A Rate Integrating Fiber Optic Gyro

A Rate Integrating Fiber Optic Gyro

Published in: Proceedings of the 47th Annual Meeting of The Institute of Navigation, June 10 - 12, 1991, Williamsburg Hilton and National Conference Center, Williamsburg, VA, p. 147-151

Posted on 1991

by John G. Mark, Daniel A. Tazartes, Bernard G. Fidric, Amado Cordova

In the past, fiber optic gyros have generally been viewed as angular rate sensors. However, for inertial navigation purposes, a "rate integrating" gyro characteristic is desired. The distinction is subtle, but important. A rate gyro's output represents an estimate of instantaneous angular rate. The system attitude is determined by sampling the rate and integrating numerically to angular displacement. On the other hand, a rate integrating gyro provides the change in rotation angle rather than instantaneous rate. The system accumulates the angular increments obtained from the gyro to determine rotation angle and, hence, attitude. A ring laser gyro is a good example of a rate integrating sensor. Its output consists of pulses that represent fixed angle increments. It is shown that an interferometric fiber optic gyro can also be configured as a rate integrating gyro. The paper discusses the theory and application of this concept.

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