Position Accuracy Enhancements with the Next Generation GPS System

Janaki R. Potukuchi, Edward J. Fernandez, Kazuma Gunning

Abstract:	The GPS Next-Generation Operational Control System (OCX) estimates satellite positions with higher accuracy compared to the current Architecture Evolution Plan (AEP) system. These improvements are achieved with improved models for the orbit-perturbing forces used in the current system and the inclusion of additional factors that perturb the satellite orbits. The GPS System Engineering & Integration (SE&I) team developed unique GPS Enterprise End-to-end Validation (GENEVA) software to validate a selected set of next generation GPS requirements. SE&I verified the software at multiple levels during GENEVA development, including a comparison of the navigation messages produced by GENEVA outputs with those from the current GPS operational system under identical operational scenarios. As the final step in the verification process, SE&I is developing a representative integrated platform that includes hardware and software simulations for comparing the software-based performance predictions with the measured results from hardware simulators under identical simulation environments. This paper provides overviews of the software (GENEVA) and hardware simulation approach and discusses the results for selected scenarios.
Published in:	Proceedings of the 2015 International Technical Meeting of The Institute of Navigation January 26 - 28, 2015 Laguna Cliffs Marriott Dana Point, California
Pages:	149 - 154
Cite this article:	Potukuchi, Janaki R., Fernandez, Edward J., Gunning, Kazuma, "Position Accuracy Enhancements with the Next Generation GPS System," Proceedings of the 2015 International Technical Meeting of The Institute of Navigation, Dana Point, California, January 2015, pp. 149-154.
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