Acquisition and Tracking Improvement by an Enhanced Comparison Based Terrain Referenced Navigation Method

J. Metzger, G.F. Trommer, P. Kreutz, B. Taddiken

Abstract:	"This paper describes a Terrain Referenced Navigation (TRN) method which is based on the comparison of a set of terrain height measurements with a reference digital terrain elevation map. The comparison is performed by calculation of the squared differences between measurements and references on a predefined grid in a search area. The result of this TRN algorithm is a position fix placed on the argument of the minimum of this comparison. The principle difference to a standard comparison based TRN system is the calculation of the accuracy of this position fix, which allows a valid data fusion in a central navigation system. This accuracy is calculated by a sampling based estimation of the density function of the position fix. Because of the non-linearities in the reference map as well as in the comparison algorithm the position fix is not Gaussian distributed. Therefore, the new calculation method allows a better approximation of the TRN position fix quality and increases the system performance for acquisition and tracking. Simulation results show the advantages of the conceived method."
Published in:	Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005) June 27 - 29, 2005 Royal Sonesta Hotel Cambridge, MA
Pages:	970 - 975
Cite this article:	Metzger, J., Trommer, G.F., Kreutz, P., Taddiken, B., "Acquisition and Tracking Improvement by an Enhanced Comparison Based Terrain Referenced Navigation Method," Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005), Cambridge, MA, June 2005, pp. 970-975.
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