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  • 1
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    Control technology for large orbiting telescopes (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Stabilization and fine pointing techniques for large orbiting telescopes
    Keywords: NAVIGATION
    Type: OPT. TELESCOPE TECHNOL. 1970; P 473-484
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Feature Identification and Location Experiment (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The Feature Identification and Location Experiment (FILE), which was flown on the second Space Shuttle flight to test a technique for real-time, autonomous classification of water, vegetation and bare land as well as clouds, snow and ice, senses earth radiation in spectral bands centered at 0.65 and 0.85 microns. The radiance ratio classification algorithm has successfully made automatic data selection decisions. A classification image obtained on the mission is providing data needed to evaluate the FILE algorithm and overall system performance.
    Keywords: GEOPHYSICS
    Type: Science; 218; Dec. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Radiometric responsivity determination for Feature Identification and Location Experiment (FILE) flown on space shuttle mission (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A procedure was developed to obtain the radiometric (radiance) responsivity of the Feature Identification and Local Experiment (FILE) instrument in preparation for its flight on Space Shuttle Mission 41-G (November 1984). This instrument was designed to obtain Earth feature radiance data in spectral bands centered at 0.65 and 0.85 microns, along with corroborative color and color-infrared photographs, and to collect data to evaluate a technique for in-orbit autonomous classification of the Earth's primary features. The calibration process incorporated both solar radiance measurements and radiative transfer model predictions in estimating expected radiance inputs to the FILE on the Shuttle. The measured data are compared with the model predictions, and the differences observed are discussed. Application of the calibration procedure to the FILE over an 18-month period indicated a constant responsivity characteristic. This report documents the calibration procedure and the associated radiometric measurements and predictions that were part of the instrument preparation for flight.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-89017 , L-16180 , NAS 1.15:89017
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Autonomous earth feature classification - Shuttle and aircraft flight test results (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Feature Identification and Location Experiment (FILE) flown on the Shuttle STS-2 mission November 12-14, 1981, tested a technique for autonomous real-time classification of selected earth features, i.e., water; bare land; vegetation; and clouds, snow, and ice. A second instrument, designed for aircraft flights, flew over regions of the west and east coasts of the United States and across the country. In each instrument, two bore-sighted CCD cameras image earth scenes in two spectral bands. Each camera includes a 100-element by 100-element detector array, and classification circuits. A simple algorithm and logic circuit provides classification decisions within a few microseconds. The experiment records the number of picture elements (pixels) representing each feature and the reflected solar radiation for each band. After flight, pixel-by-pixel classification images are constructed and compared with 70-mm color photographs taken simultaneously with the CCD-camera data.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: AIAA PAPER 83-0417
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Adaptive remote sensing technology for feature recognition and tracking (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A technology development plan designed to reduce the data load and data-management problems associated with global study and monitoring missions is described with a heavy emphasis placed on developing mission capabilities to eliminate the collection of unnecessary data. Improved data selectivity can be achieved through sensor automation correlated with the real-time needs of data users. The first phase of the plan includes the Feature Identification and Location Experiment (FILE) which is scheduled for the 1980 Shuttle flight. The FILE experiment is described with attention given to technology needs, development plan, feature recognition and classification, and cloud-snow detection/discrimination. Pointing, tracking and navigation received particular consideration, and it is concluded that this technology plan is viewed as an alternative to approaches to real-time acquisition that are based on extensive onboard format and inventory processing and reliance upon global-satellite-system navigation data.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Institute of Electrical and Electronics Engineers, Conference on Pattern Recognition and Image Processing; Aug 06, 1979 - Aug 08, 1979; Chicago, IL
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    A scaling technique for air-bearing simulation of precision pointing systems (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Scaling technique for air bearing simulation of precision pointing system for large telescope
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-6197 , L-7532
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A laboratory simulation of a single-axis dual-level precision pointing system (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The laboratory simulation of a scaled single-axis dual-level control system for a large space telescope is demonstrated. The dual-level control system consists of a coarse-body-pointing system and a fine-pointing system, which uses an image motion compensator, an image dissector tube, and digital electronics. The results of the simulation indicate that the dual-level system can be used to provide tracking capability within one-tenth of a diffraction-limited image diameter of a 3-meter f/100 telescope for stars up to a +12.3 visual magnitude.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-7319 , L-8943
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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