Availability of guidestars for SIM
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SIM space interferometry mission guidestar statist↗
Engineering topics
Yu, J. W.
Publications and source records attributed to Yu, J. W..
Space interferometry mission spacecraft pointing error budgets
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space interferometry mission error budget↗
The Palomar Testbed Interferometer
The Palomar Testbed Interferometer (PTI) is a long-baseline infrared interferometer located at Palomar Observatory, California. It was built as a testbed for interferometric techniques applicable to the Keck Interferometer. First fringes were obtained in 1995 July. PTI implements a dual-star architecture, tracking two stars simultaneously for phase referencing and narrow-angle astrometry. The three fixed 40 cm apertures can be combined pairwise to provide baselines to 110 m. The interferometer actively tracks the white-light fringe using an array detector at 2.2 microns and active delay lines with a range of +/-38 m. Laser metrology of the delay lines allows for servo control, and laser metrology of the complete optical path enables narrow-angle astrometric measurements. The instrument is highly automated, using a multiprocessing computer system for instrument control and sequencing.
Colavita, M. M.↗
Deep Space 3 Metrology System
A metrology subsystem on board the Deep Space 3, a separated interferometer mission, is used to determine stellar fringe delay jitter, delay rate, and intial delay.
Deep↗
Separated Spacecraft Interferometer Concept for the New Millenium Program
A separated spacecraft optical interferometer mission concept proposed for NASA'a New Millenium Program is described. The interferometer insturment is distributed over three small spacecraft: two spacecraft serve as collectors, directing starlight toward a third spacecraft which combines the light and performs the interferometric detection.
optical↗