746 th Test Squadron Wide Area Augmentation System (WAAS) T & E Phase I Testing

Dan Gillen, Gene Cummins, Jose L. Diaz

Abstract:	The research reported in this paper was conducted by personnel of the 46 th Test Group (AFMC), Holloman AFB, NM. Opinions, conclusions, and recommendations contained in this paper are those of the author and are not necessarily endorsed by the US Air Force. The testing described in this paper consisted of developing GPS/WAAS flight test capability by modifying an Air Force Flight Standards Agency (AFFSA) NC-21A aircraft (Learjet 35A) with GPS/WAAS avionics, reference equipment, and a Data Acquisition System (DAS). The overall objective of the Phase I testing was to quantify the navigation capability of the NC-21A GPS/WAAS avionics to support further testing. The specific objective for the testing described in this paper was to quantify WAAS accuracies by characterizing the navigation accuracies of the GPS Silicon Valley (GSV) WAAS receiver and Universal UNS-1B+ Flight Management System (FMS) when flying Standard Category I precision approaches. The analysis to evaluate the WAAS receiver accuracies during precision approaches focused on the estimation of the GPS/WAAS cross-track and vertical position errors, Flight Technical Error (FTE), and the Total System Error (TSE). This analysis of the testing described in this paper concluded that the WAAS position errors were within the specification for precision approach operations of 7.6 m in the horizontal and vertical axes.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	205 - 212
Cite this article:	Gillen, Dan, Cummins, Gene, Diaz, Jose L., "746 th Test Squadron Wide Area Augmentation System (WAAS) T & E Phase I Testing," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 205-212.
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