International GPS service 2000: life without SA
This paper will provide the status of IGS products and applications, contrasting before and after the removal of SA.
IGS orbits GPS selective availability↗
Engineering topics
Springer, T.
Publications and source records attributed to Springer, T..
International GPS Service: life without SA
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International GPS Service global positioning syste↗
GPS Measurements of Earth Rotation - The Contribution of the International GPS Service
In the past 20 years, dramatic technological advances in space geodesy have deepened our understanding of the rotation of the Earth and other aspects of our planet.
GPS Earth Rotation Earth Orientation↗
Recent Successes and Future Visions of the International GPS Service
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GPS Networks IGS Applications↗
Highlights of Recent Developments in the International GPS Service and Perspectives for Future Directions
In December 1998, the IGS Governing Board officially changed the name of this IAG service from 'International GPS Service for Geodynamics to simply the 'International GPS Service'. This change of name reflects the fact that today the IGS supports numerous scientific projects outside the traditional geodetic and geodynamic disciplines. A number of IGS projects and working groups have been established, each concentrating on a particular science application, such as the ionosphere, atmosphere, reference frame, precise time transfer, etc. These activities are enabled and simulated by the IGS and directly contribute to the continuing development of the service. The IGS is currently poised to respond to evolving user requirements that focus on timeliness and reliability of data and products, particularly in support of a slate of Low Earth Orbiter missions over the next decade. Perspectives on the future of the IGS will be developed based on current directions as well as anticipated external influences, such as GPS satellite modernization, GLONASS, availability of global communications, and plans for the European GALILEO (Global Navigation Satellite System - GNSS). We will address development of user friendly interfaces and IGS product tutorials.
Neilan, R.↗
Space Station Freedom solar dynamic power generation
Viewgraphs on Space Station Freedom solar dynamic power generation are presented. Topics covered include: prime contract activity; key solar dynamic power module requirements; solar dynamic heat receiver technology; and solar concentrator advanced development.
Springer, T.↗
Optical measurements pertaining to Space Station solar dynamic power systems
The Space Station solar dynamic power system is a hybrid of solar photovoltaic and solar dynamic systems, the latter of which uses a parabolic reflector to collect solar energy. This paper describes analytical results of an off-axis solar illumination on the intensity distribution in arbitrary target planes perpendicular to the axis of a parabolic reflector. Such computational capability would make it possible to predict optical intensity distributions resulting from off-axis angles of incident radiation on such target planes. To validate the computer code, experimental optical measurements were performed on the multifaceted paraboloidal collecor at the Solar Dynamic Test Facility at Rockedyne's Santa Susana Field Laboratory. The experimental data compared reasonably well with the calculated values.
Holly, S.↗