Evaluation of Wide Area Differential GPS for Missile Testing

James P. Cunningham, Benjamin W. Remondi, Bruce R. Hermann, Alan G. Evans

Abstract:	The use of a Wide Area Differential Global Positioning System (WADGPS) in real-time is addressed for support of the Navy Theater Ballistic Missile Defense (TBMD) Test and Evaluation. Experiments were conducted to establish the level of accuracy achievable using WADGPS over vast areas typical of TBMD testing. Navigated positions for a static site and a low dynamic user were generated using smoothed Coarse/Acquisition (C/A) pseudoranges and broadcast ephemerides collected on May 28. 1997, and WADGPS correctors generated using software being developed by The XYZ’s of GPS, Inc. and NSWCDD. Five different WADGPS networks of reference stations were used to generate correctors. Average network-to-user distances ranged from 40 km in the smallest network to nearly 2000 km in the largest network. For the WADGPS networks tested, the differences between truth and navigated positions were determined. In general, positioning accuracy was about a meter with: (a) the horizontal components being more than twice as accurate as the vertical and (b) the smaller networks being somewhat more accurate than the larger networks, especially for the vertical component bias. Specific positioning results for each network are presented. Accuracies are analyzed and discussed.
Published in:	Proceedings of the 1998 National Technical Meeting of The Institute of Navigation January 21 - 23, 1998 Westin Long Beach Hotel Long Beach, CA
Pages:	589 - 597
Cite this article:	Cunningham, James P., Remondi, Benjamin W., Hermann, Bruce R., Evans, Alan G., "Evaluation of Wide Area Differential GPS for Missile Testing," Proceedings of the 1998 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 1998, pp. 589-597.
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