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Proceedings Paper

Improved ring laser gyro navigator
Author(s): Michael J. Hadfield; Tom Stiles; David Seidel; William G. Miller; David Hensley; Steve Wisotsky; Michael Foote; Rob Gregory
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Paper Abstract

An improved ring laser gyro-based inertial navigation unit (RLG INU) has recently been delivered. The new RLG INU is an all-attitude strapdown inertial navigator. Designed to provide superior attitude performance, this new RLG INU also provides navigation performance well within the Air Force Standard Navigator requirements for a strapdown system. The new design expands upon F-15 and Air Force Standard Navigator INU technology. A number of techniques were employed to achieve superior performance. The sensor assembly was redesigned to increase stiffness and reduce coning characteristics. Filtering algorithms were redesigned to reduce noise under 2.5 arc seconds. Coning algorithms were redesigned to reduce compensation errors. Attitude computation rates were increased to 300 Hz to reduce data delays. A faster microprocessor was incorporated in order to implement the improved coning compensation, filtering techniques, and higher attitude computation rates. New calibration techniques were developed because of the navigation and attitude precision of this navigator. Extensive ground testing has shown the navigator's performance to be well within requirements. Performance does not appear to degrade at either temperature extreme, nor in a rigorous vibration environment. Limited flight testing has demonstrated the RLG INU's navigation performance. More extensive flight test results should be available later this year. This paper provides the design rationale for this unit, its ground/flight performance, and plans for further testing.

Paper Details

Date Published: 1 July 1991
PDF: 19 pages
Proc. SPIE 1478, Sensors and Sensor Systems for Guidance and Navigation, (1 July 1991); doi: 10.1117/12.45629
Show Author Affiliations
Michael J. Hadfield, Honeywell, Inc. (United States)
Tom Stiles, Honeywell, Inc. (United States)
David Seidel, Honeywell, Inc. (United States)
William G. Miller, Honeywell, Inc. (United States)
David Hensley, Honeywell, Inc. (United States)
Steve Wisotsky, Textron Defense Systems (United States)
Michael Foote, Textron Defense Systems (United States)
Rob Gregory, Textron Defense Systems (United States)

Published in SPIE Proceedings Vol. 1478:
Sensors and Sensor Systems for Guidance and Navigation
Jack F. Wade; Avi Tuchman, Editor(s)

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