DASSAULT-SERCEL NP's KART technique extended to dual-frequency reception : New applications are made possible

René Gounon, Jean-Pierre Barboux

Abstract:	DASSAULT-SERCEL Navigation & Positioning developed an innovative technique known as KART. KART has been marketed by DSNP within its DGPS range of products operating in real-time kinematic mode. This was the first method to achieve reliable OTF initialisations within minutes using single frequency (L1) receivers. The KART technique proved to be ideally suited to open area applications, providing users with extremely cost effective equipment. However, limitations appeared in adverse GPS receiving conditions leading in these cases to impractical cumulative initialisation times. Those limitations prompted DSNP to extend the KART method to dual frequency operation, leading to the Long Range Kinematic (LRK Ò ) method we shall present below. This paper first reviews the principles and performance of KART, then presents its extension to encompass dual frequency. A large section is devoted to the presentation and discussion of the remarkable test results obtained with LRK and the new generation of dual frequency GPS receivers marketed by DSNP: OTF initialisations of a few seconds are achieved at distances of approximately 40 km., and remain achievable even when the number of visible satellites drops to 4. This performance, that did not seem achievable until now is discussed extensively, first in the case of normal conditions, then in the case of reduced visibility (5 and 4 satellites). Finally, we will present applications where real time kinematic techniques would not normally be applicable but now are possible with the innovations represented by LRK.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	1773 - 1779
Cite this article:	Gounon, René, Barboux, Jean-Pierre, "DASSAULT-SERCEL NP's KART technique extended to dual-frequency reception : New applications are made possible," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 1773-1779.
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