A proposal to extend the ICRF to higher frequencies
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VLBI international celestial reference frame↗
Engineering topics
Ulvestad, J.
Publications and source records attributed to Ulvestad, J..
A proposal to extend the ICRF to multiple frequencies
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VLBI international celestial reference frame↗
ARISE Antenna
Supermassive black holes are among the most spectacular objects in the Universe, and are laboratories for physics in extreme conditions.
ARISE Antenna System Requirements black holes↗
ARISE: The Next Generation Space VLBI Mission
We have defined an affordable advanced Space Very Long Baseline Interferometry (VLBI) mission named ARISE (Astronomical Radio Interferometry between Space and Earth).
Very↗
International Mission Planning for Space Very Long Baseline Interferometry
Two spacecraft dedicated to Very Long Baseline Interferometry (VLBI) will be launched in 1996 and 1997 to make observations using baselines between the space telescopes and many of the world's ground radio telescopes.
Very↗
Spacecraft and Mission Design for the Precision Optical INTerferometer in Space (POINTS)
This paper describes key features of the instrument, spacecraft, and mission design for the Precision Optical INTerferometer in Space (POINTS), which have evolved through studies at the Jet Propulsion Laboratory during the last few years. This paper complements others in theis volume that describe the POINTS instrument, its scientific objectives, and specific engineering concerns.
flight-system↗
Source and event selection for radio-planetary frame-tie measurements using the Phobos Landers
The Soviet Phobos Lander mission will place two spacecraft on the Martian moon Phobos in 1989. Measurements of the range from Earth-based stations to the landers will allow an accurate determination of the ephemerides of Phobos and Mars. Delta Very Long Base Interferometry (VLBI) between the landers and compact radio sources nearby on the sky will be used to obtain precise estimates of the angular offset between the radio and planetary reference frames. The accuracy of this frame-tie estimate is expected to be in the vicinity of 10 mrad, depending on how well several error sources can be controlled (calibrated or reduced). Many candidate radio sources for VLBI measurements were identified, but additional work is necessary to select those sources which have characteristics appropriate to the present application. Strategies for performing the source selection are described.
Linfield, R.↗