Development and Testing of an Integrated INS/GPS Cross-Linked System for Sub-Meter Positioning of a CF-188 Jet Fighter

M.E. Cannon, G. Lachapelle, and H. Sun T. Fletcher, R. Caballero and I. Hawes

Abstract:	In order to achieve sub-meter accuracy for the positioning of a CF-188 jet fighter (Canadian version of the F-18) under 360 degree rolls, two GPS antennas mounted on top and under the aircraft fuselage are used. The two receivers are cross-linked through the use of a common oscillator and the continuous exchange of position, velocity and clock information to accelerate satellite acquisition during roll overs. A gimbaled INS is used to derive the lever arm between the two antennas and to augment GPS during critical roll over periods. The GPS/INS data time synchronization and data logging are performed using a solid state data logging system developed for this purpose. GPS data is post-processed in differential carrier phase ambiguity float mode, with respect to a reference station within 60 km from the aircraft. A Kalman filter is used to enhance positioning accuracy, especially during periods of losses of carrier phase lock. The analysis of flight tests conducted under various dynamics shows that a positioning accuracy better than one meter is maintained.
Published in:	Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999) June 27 - 30, 1999 Royal Sonesta Hotel Cambridge, MA
Pages:	463 - 474
Cite this article:	Cannon, M.E., Lachapelle, G., Fletcher, H. Sun T., Caballero, R., Hawes, I., "Development and Testing of an Integrated INS/GPS Cross-Linked System for Sub-Meter Positioning of a CF-188 Jet Fighter," Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), Cambridge, MA, June 1999, pp. 463-474.
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