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  • Other Sources  (2)
  • 1975-1979  (2)
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  • 1
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    On-board landmark navigation and attitude reference parallel processor system (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: An approach to autonomous navigation and attitude reference for earth observing spacecraft is described along with the landmark identification technique based on a sequential similarity detection algorithm (SSDA). Laboratory experiments undertaken to determine if better than one pixel accuracy in registration can be achieved consistent with onboard processor timing and capacity constraints are included. The SSDA is implemented using a multi-microprocessor system including synchronization logic and chip library. The data is processed in parallel stages, effectively reducing the time to match the small known image within a larger image as seen by the onboard image system. Shared memory is incorporated in the system to help communicate intermediate results among microprocessors. The functions include finding mean values and summation of absolute differences over the image search area. The hardware is a low power, compact unit suitable to onboard application with the flexibility to provide for different parameters depending upon the environment.
    Keywords: ASTRODYNAMICS
    Type: NASA. Goddard Space Flight Center Flight Mechanics(Estimation Theory Symp.; p 153-177
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    A study of phase transitions in lead difluoride by use of polychromatic X-ray diffraction (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A polychromatic X-ray diffraction technique was used to obtain patterns of alpha-PbF2 and beta-PbF2. The results obtained at room temperature and 314 C at 1 atm, and at room temperature at 5.5 kbar, are in good agreement with published data. The advantages of the technique for high-temperature and high-pressure work are discussed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: High Temperatures - High Pressures; 7; 3, 19; 1975
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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