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  • 1
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    Synthetic aperture microwave radiometer (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Realizing the full potential of microwave remote sensing from space requires putting relatively large antennas in orbit. Research is being conducted to develop synthetic aperture antennas to reduce the physical collecting area required of sensors in space, and to possibly open the door to new applications of microwave remote sensing. The technique under investigation involves using a correlation interferometer with multiple baselines. The Microwave Sensors and Data Collection Branch has been engaged in research to develop this technique for applications to remote sensing of soil moisture from space. Soil moisture is important for agricultural applications and for understanding the global hydrologic cycle. An aircraft prototype of an instrument suitable for making such measurements was developed. This is an L-band radiometer called ESTAR which is hoped will become part of the Earth Observing System (EOS). ESTAR is a hybrid instrument which uses both real aperture antennas (long sticks to obtain resolution in the along-track dimension) and aperture synthesis (correlation between sticks to obtain resolution in the cross track dimension). The hybrid was chosen as a compromise to increase the sensitivity (T) of the instrument.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Laboratory for Oceans; p 237-238
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The Electronically Steered Thinned Array Radiometer (ESTAR) (1986)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: The concept of a thinned array radiometer is described as an alternate to large filled apertures to achieve high resolution imaging from space. The serious limitations of conventional mechanical scanning systems and the practical problems associated with a multiple receiver pushbroom system that utilizes a large antenna are discussed. The thinned array is developed in terms of aperture synthesis techniques used in radio astronomy. Examples of thinned array configurations are presented, and future directions are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ESA Proceedings of the 1986 International Geoscience and Remote Sensing Symposium (IGARSS '86) on Remote Sensing: Today's Solutions for Tomorrow's Information Needs, Volume 1; p 591-593
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    GSFC short pulse radar, JONSWAP-75 (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: In September 1975, the Goddard Space Flight Center operated a short pulse radar during ocean wave measuring experiments off the coast of West Germany in the North Sea. The experiment was part of JONSWAP-75. The radar system and operations during the experiment are described along with examples of data.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-8502 , G-7702-F11
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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