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  • SPACECRAFT INSTRUMENTATION  (3)
  • 1
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    ASTROS - High-performance CCD tracker for spacecraft (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The architecture, capabilities, and testing of the Advanced Star and Target Reference Optical Sensor (ASTROS) I and II are described. The ASTROS I tracker is to be utilized for a UV telescope experiment on a Shuttle flight and is capable of measuring pointing errors of 1.5 microrad, and the ASTROS II tracker is being developed for the Mariner Mark II spacecraft to perform tracking, guiding, and optical navigation functions. The requirements for the two trackers are compared. Consideration is given to star and target tracking, optical navigation, and mass and power constraints. The compositions of the trackers, in particular the sensor, electrode drives, amplifiers and signal clamp, video signal processor, control and timing generator, memories, microprocessor, and interface, are examined.
    Keywords: SPACECRAFT INSTRUMENTATION
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    NASA TECHNICAL REPORTS
  • 2
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    ASTROS - A sub-arcsec CCD star tracker (1984)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The design and application of ASTROS (Advanced Star and Target Reference Optical Sensor) are described, with emphasis on performance test results acquired with a prototype system. The ASTROS tracker provides extremely precise measurements of star image coordinates as inputs to the Image Motion Compensation (IMC) system used to stabilize the science instrument focal planes. Performance levels achieved are dramatic improvements over the levels achieved with image dissector designs with comparable fields of view.
    Keywords: SPACECRAFT INSTRUMENTATION
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    NASA TECHNICAL REPORTS
  • 3
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    The development of a charge-coupled device tracker for spacecraft (1987)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Charge-coupled device (CCD) optical sensors have made it possible to construct high performance star and target trackers for spacecraft. The Advanced Star and Target Reference Orbital Sensor (ASTROS) trackers have been developed by JPL for the Shuttle-based astronomical flight Astro-1 and the Mariner Mark II (MMII) spacecraft. For the Shuttle application the tracker will provide the data for high precision instrument pointing and for the MMII application the tracker will provide stellar and extended target tracking data for flyby and rendezvous navigation. The specifications, architecture, and testing program for these trackers will be described. Laboratory measurements have demonstrated that these trackers can be very effective. The versatility and flexibility of the ASTROS type trackers will permit adaptation to a variety of navigation and guidance applications. These trackers represent one of the technologically advanced components that will be used in the development of the next generation of spacecraft.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: AAS PAPER 87-007 , Guidance and control 1987; Jan 31, 1987 - Feb 04, 1987; Keystone, Co; United States
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    NASA TECHNICAL REPORTS
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