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  • SPACECRAFT INSTRUMENTATION  (2)
  • ASTRONAUTICS (GENERAL)  (1)
  • 1
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    Orbiting stellar interferometer for astrometry and imaging (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The orbiting stellar interferometer (OSI) is a concept for a first-generation space interferometer with astrometric and imaging goals. The OSI is a triple Michelson interferometer with articulating siderostats and optical delay lines. Two point designs for the instrument are described. The 18-m design uses an 18-m maximum baseline and aperture diameters of 40 cm; the targeted astrometric performance is a wide-field accuracy of 10 microarsec for 16-mag objects in 100 s of integration time and for 20-mag objects in 1 h. The instrument would also be capable of synthesis imaging with a resolution of 5 marcsec, which corresponds to the diffraction limit of the 18-m base line. The design uses a deployed structure, which would fold to fit into an Atlas IIAS shroud, for insertion into a 900-km sun-synchronous orbit. In addition to the 18-m point design, a 7-m point design that uses a shorter base line in order to simplify deployment is also discussed. OSI's high performance is made possible by utilizing laser metrology and controlled-optics technology.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics (ISSN 0003-6935); 32; 10; p. 1789-1797.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A mission and system design option for the Orbiting Stellar Interferometer (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Orbiting Stellar Interferometer (OSI) is a proposed space-based observatory that will open exciting new vistas in astronomy and address fundamental scientific questions by making extremely accurate (3 to 30 microarcsecond) astrometric measurements of the positions of stars, quasars, and other astronomical objects as faint as magnitude 20. In addition, it will be able to image objects with a resolution of about 13 milliarcseconds. Using the lessons learned from the development of a point design for OSI, the Jet Propulsion Laboratory has developed a new conceptual design, with emphasis on reducing its cost and complexity while maximizing the return of valuable science.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: IAF PAPER 92-0527
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    NASA TECHNICAL REPORTS
  • 3
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    Calibration and operation of a large space-based optical interferometer (1990)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The on-orbit calibration of the optics, structure, and control systems of the CSI Focus Mission Interferometer (FMI) is described. The calibration involves the estimation and propagation of both positional and rotational parameters and the propagation of both positional and rotational parameters at the nanometer/nanoradian level. It is shown that, given a nanometer class metrology system to monitor positional changes of critical optical elements, this calibration procedure should enable the FMI to perform 50 picoradian astrometry. The same Kalman filter that implements the initializing calibration of the interferometer baselines and internal pathlengths will also participate in the astrometric measurements of stellar positions.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: AAS PAPER 90-040 , Annual Rocky Mountain Guidance and Control Conference; Feb 03, 1990 - Feb 07, 1990; Keystone, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
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