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  • 1
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    Performance Evaluation of the Geostationary Synthetic Thinned Array Radiometer (GeoSTAR) Demonstrator Instrument (2006)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: The design, error budget, and preliminary test results of a 50-56 GHz synthetic aperture radiometer demonstration system are presented. The instrument consists of a fixed 24-element array of correlation interferometers, and is capable of producing calibrated images with 0.8 degree spatial resolution within a 17 degree wide field of view. This system has been built to demonstrate performance and a design which can be scaled to a much larger geostationary earth imager. As a baseline, such a system would consist of about 300 elements, and would be capable of providing contiguous, full hemispheric images of the earth with 1 Kelvin of radiometric precision and 50 km spatial resolution.
    Keywords: Earth Resources and Remote Sensing
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Battery-package design provides for cell cooling and constraint (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Lightweight battery-package provides for even cooling of individual alkaline cells, constraint against cell expansion, and convenient placement of cells. The battery package also provides for venting of the cells and includes instrumentation to measure cell temperature, pressure, and voltage.
    Keywords: MECHANICS
    Type: MSC-11839
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Merits of flywheels for spacecraft energy storage (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Flywheel energy storage systems which have a very good potential for use in spacecraft are discussed. This system can be superior to alkaline secondary batteries and regenerable fuel cells in most of the areas that are important in spacecraft applications. Of special importance, relative to batteries, are lighter weight, longer cycle and operating life, and high efficiency which minimizes solar array size and the amount of orbital makeup fuel required. Flywheel systems have a long shelf life, give a precise state of charge indication, have modest thermal control needs, are capable of multiple discharges per orbit, have simple ground handling needs, and have characteristics which would be useful for military applications. The major disadvantages of flywheel energy storage systems are that: power is not available during the launch phase without special provisions; and in flight failure of units may force shutdown of good counter rotating units, amplifying the effects of failure and limiting power distribution system options; no inherent emergency power capability unless specifically designed for, and a high level of complexity compared with batteries. The potential advantages of the flywheel energy storage system far outweigh the disadvantages.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Langley Research Center An Assessment of Integrated Flywheel System Technol.; p 75-89
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Flywheel energy storage for spacecraft (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Flywheel energy storage systems have been studied to determine their potential for use in spacecraft. This system was found to be superior to alkaline secondary batteries and regenerative fuel cells in most of the areas that are important in spacecraft applications. Of special importance, relative to batteries, are lighter weight, longer cycle and operating life, and high efficiency which minimizes solar array size and the amount of orbital makeup fuel required. In addition, flywheel systems have a long shelf life, give a precise state of charge indication, have modest thermal control needs, are capable of multiple discharges per orbit, have simple ground handling needs, and have the capability of generating extremely high power for short durations.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''84: Advanced energy systems - Their role in our future; Aug 19, 1984 - Aug 24, 1984; San Francisco, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Prototype development of a Geostationary Synthetic Thinned Aperture Radiometer, GeoSTAR (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preliminary details of a 2-D synthetic aperture radiometer prototype operating from 50 to 55 GHz will be presented. The laboratory prototype is being developed to demonstrate the technologies and system design needed to do millimeter-wave atmospheric soundings with high spatial resolution from Geostationary orbit. The concept is to deploy a large thinned aperture Y-array on a geostationary satellite, and to use aperture synthesis to obtain images of the Earth without the need for a large mechanically scanned antenna. The laboratory prototype consists of a Y-array of 24 horn antennas, MMIC receivers, and a digital cross-correlation sub-system.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE Geoscience and Remote Sensing Society (IGARSS); Sep 20, 2004; Achorage, AK; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Initial Results of the Geosynchronous Synthetic Thinned Array Radiometer (GeoSTAR) (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An error budget is presented to meet 1 Kelvin radiometric accuracy in a geostationary atmospheric sounder with 50 km spatial resolution on the earth. The gain and phase errors are weighted by the magnitude of visibility versus antenna separation, and requirements range between approx.0.5% and 0.3 degrees of amplitude and phase, respectively, for the closest spacings at the center of the array, and about 5% and 3 degrees for the majority of the array. The latter requirement is met by our design without any special testing or stabilizations by reference signals. The former is met using an internal noise diode reference and by measuring the detailed antenna patterns on the antenna range. Biases and other additive errors in the raw visibility samples must be below about 2 mK on average, and this requirement is met by a phase shifting scheme applied to the local oscillator distribution. An outline of the data processing is presented, along with the first images from this system.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE GeoScience and Remote Sensing Symposium; Jul 26, 2006 - Aug 04, 2006; Denver, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
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