FLIGHT TESTS OF TWO AIRBORNE OMEGA NAVIGATION SYSTEMS

F. C. Sakran, Jr. and P. B. Burch

Peer Reviewed

Abstract:	Two current OMEGA navigation systems designed for airborne use have received military designations: the AN/ARN-99(V)2 and the AN/ARN-115. Both use general purpose digital computers to provide fully automatic synchronization, phase tracking, station selection, and diurnal propagation corrections for display of aircraft latitude/longitude position coordinates. Both systems use all three Omega navigational frequencies, but only the ARN-99(V)2 implements difference frequency lane resolution. The ARN-115 employs three station hyperbolic geometry to directly determine geographic position. The ARN-99(V)2 estimates position by statistically optimum weighting of all available Omega measurements in a Kalman filter algorithm. The U.S. Naval Air Test Center recently evaluated both systems during flight tests in P-3 type aircraft. Observed accuracy of the two mechanizations is presented with emphasis on the effects of station geometry and diurnal propagation correction errors. Experiences with sudden station outages, precipitation static, and on-board generated coherent interference are discussed.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 21, Number 3
Pages:	194 - 207
Cite this article:	Sakran, F. C., Jr.,, Burch, P. B., "FLIGHT TESTS OF TWO AIRBORNE OMEGA NAVIGATION SYSTEMS", NAVIGATION: Journal of The Institute of Navigation, Vol. 21, No. 3, Fall 1974, pp. 194-207.
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