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  • 1
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    Global digital topography mapping using a scanning radar altimeter (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The conceptual design of a Scanning Radar Altimeter system capable of collecting less than 300-m spatial and less than 3-m height resolution digital topography data for the entire globe, from an orbital platform, is presented. A 37-GHz frequency SRA system is used to achieve the requisite resolution while reducing antenna length in the along-track dimension. Near-global coverage in a short time period is obtained by scanning the antenna beam cross-track, in a swath of about 100 km. Attention is given to the algorithm that will be used to retrieve pixel height from the return waveform.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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    NASA TECHNICAL REPORTS
  • 2
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    On the design issues for a spaceborne rain mapping radar (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The design concept for the spaceborne rain mapping radar for the Tropical Rain Measuring Mission (TRMM) of Thiele (1987) is examined. The TRMM requirements for sampling strategy, spatial and height resolutions, observable altitude, and rain rate measurement range are described. The adaptive scanning and nadir Doppler measurement modes for the radar are discussed.
    Keywords: SPACECRAFT INSTRUMENTATION
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  • 3
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    Evaluation of land altimetry systems (1986)
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    Publication Date: 2013-08-29
    Description: The performance of land altimetry systems was studied by simulating radar returns from modeled and actual topographic data. Four different algorithms were considered and contrasted using a set of performance criteria. A potential definition of the horizontal resolution of a radar altimeter was evaluated. Results indicate that the peak-power and threshold algorithms are more affected by noise and changes in surface topography than the centroid and half-energy algorithms. The centroid and half-energy algorithms can provide better spatial resolutions for the altimetric measurements.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    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 3; p 1327-1330
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  • 4
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    Global digital topography mapping with a synthetic aperture scanning radar altimeter (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Global digital topography data of the land surface is of importance in a variety of geoscientific and application disciplines. Such a database, with a spatial resolution of 150 to 500 m and height accuracy of 5 m or better can be acquired from an orbiting platform using a synthetic aperture scanning radar altimeter. Near-global coverage can be achieved within 14 days from an orbiting platform in a polar or near-polar orbit.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 11; 585-601
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  • 5
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    Multicolor laser altimeter for barometric measurements over the ocean - Theoretical (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: It is noted that the optical path length from a satellite to the earth's surface strongly depends on the atmospheric pressure along the propagation path. The theoretical basis of a surface pressure measurement technique, which uses a two-color laser altimeter to observe the change with wavelength in the optical path length from a satellite to the ocean surface, is evaluated. The statistical characteristics of the ocean-reflected pulses and the expected measurement accuracy are analyzed in terms of the altitude parameters. The results show that it is feasible to obtain a pressure accuracy of a few millibars.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics (ISSN 0003-6935); 22; Sept. 1
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