Development of a Small Precision FOG IMU

Roger Valeri, Edward Arnn, Ian Humphery and Christopher Reynolds

Abstract:	Raytheon has recently developed an Advanced Targeting Forward Looking Infra-Red (ATFLIR) system (AN/ASQ- 228) for the F/A-18 with the ability to provide precise long range targeting information for GPS-guided weapons such as JDAM and JSOW. The precision required for targeting these weapons at long range necessitated development of a small, precision Inertial Measurement Unit (IMU) able to provide precise line of sight knowledge. The IMU is transfer aligned to the aircraft's GPS/Inertial system using velocity/position matching. Very low IMU drift rate is required to minimize line-of-sight drift during straight-and-level flight. This paper describes the design and trade-offs made by Raytheon and the IMU manufacturer, Fibersense, of this small Fiber Optic Gyro (FOG) IMU which weighs 3.5 lbs, and has drift rates of substantially less than 0.1 deg/hr in a fighter aircraft environment.
Published in:	Proceedings of the 57th Annual Meeting of The Institute of Navigation (2001) June 11 - 13, 2001 Albuquerque, NM
Pages:	609 - 613
Cite this article:	Valeri, Roger, Arnn, Edward, Humphery, Ian, Reynolds, Christopher, "Development of a Small Precision FOG IMU," Proceedings of the 57th Annual Meeting of The Institute of Navigation (2001), Albuquerque, NM, June 2001, pp. 609-613.
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