International GPS Service 2000: Life without SA

Ruth E. Neilan, Angelyn Moore, Tim Springer, Jan Kouba, Jim Ray and Christoph Reigb

Abstract:	Over the last eight years the International GPS Service (IGS) has produced GPS data and products at the highest level of precision available. Today, IGS orbit determination of the GPS satellites is consistently at the 5 centimeter level, 3d-wrms (three dimensional weighted root mean square error), with sub-centimeter station positioning globally. How does the removal of Selective Availability (SA) affect and enhance the IGS processes and products? First we will provide the status of IGS products and applications, contrasting before and after the removal of SA. Future directions of the IGS rely on the evolving infrastructure and expertise of IGS, which support an increasing number of activities. These activities include a project for precise time transfer dependent on GPS; support for low Earth orbiting satellites (LEOs) carrying on-board GPS flight receivers; a pilot service for tracking the Russian GLONASS satellites; estimation of ground-based GPS atmospheric parameters; global monitoring and mapping of the ionosphere; and continued extension of a dense homogenous reference frame through GPS. A new thrust is a coordinated, real-time GPS network within the IGS.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	438 - 446
Cite this article:	Neilan, Ruth E., Moore, Angelyn, Springer, Tim, Kouba, Jan, Ray, Jim, Reigb, Christoph, "International GPS Service 2000: Life without SA," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 438-446.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In