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  • 1
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    Global digital topography mapping with a synthetic aperture scanning radar altimeter (1990)
    Taylor & Francis
    Details
    Publication Date: 1990-04-01
    Print ISSN: 0143-1161
    Electronic ISSN: 1366-5901
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Taylor & Francis
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    PAPER CURRENT
  • 2
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    Global digital topography mapping using a scanning radar altimeter (1987)
    In:  Other Sources
    Details
    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
  • 3
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    Conceptual design of a spaceborne radar for global rain mapping (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The conceptual design of a spaceborne rain mapping radar is described. This system has dual frequency channels operating at 14 and 35 GHz. It is capable of measuring precepitation profiles for rainfall rates from 0.3 mm/hr and up to 60 mm/hr. The rain reflectivity measurements obtained by this system are expected to have accuracies better than 10 percent.
    Keywords: METEOROLOGY AND CLIMATOLOGY
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    NASA TECHNICAL REPORTS
  • 4
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    Airborne rain mapping radar (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An airborne scanning radar system for remote rain mapping is described. The airborne rain mapping radar is composed of two radar frequency channels at 13.8 and 24.1 GHz. The radar is proposed to scan its antenna beam over + or - 20 deg from the antenna boresight; have a swath width of 7 km; a horizontal spatial resolution at nadir of about 500 m; and a range resolution of 120 m. The radar is designed to be applicable for retrieving rainfall rates from 0.1-60 mm/hr at the earth's surface, and for measuring linear polarization signatures and raindrop's fall velocity.
    Keywords: AIRCRAFT INSTRUMENTATION
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    NASA TECHNICAL REPORTS
  • 5
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    On the design issues for a spaceborne rain mapping radar (1988)
    In:  Other Sources
    Details
    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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    NASA TECHNICAL REPORTS
  • 6
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    Evaluation of land altimetry systems (1986)
    In:  Other Sources
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Global digital topography mapping with a synthetic aperture scanning radar altimeter (1990)
    In:  Other Sources
    Details
    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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    NASA TECHNICAL REPORTS
  • 8
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    Analysis of short pulse laser altimetry data obtained over horizontal path (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Recent pulsed measurements of atmospheric delay obtained by ranging to the more realistic targets including a simulated ocean target and an extended plate target are discussed. These measurements are used to estimate the expected timing accuracy of a correlation receiver system. The experimental work was conducted using a pulsed two color laser altimeter.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-170612 , NAS 1.26:170612 , RRL-PUB-526
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Multicolor laser altimeter for barometric measurements over the ocean - Theoretical (1983)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Theoretical and experimental analyses of the performance of two-color laser ranging systems (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The statistical properties of the signals reflected from the retroreflector equipped satellites were studied. It is found that coherence interference between pulse reflections from retroreflectors of different ranges on the array platform is the primary cause of signal fluctuations. The performance of a cross-correlation technique to estimate the differential propagation time is analyzed by considering both shot noise and speckle. For the retroreflector arrays, timing performance is dominated by interference induced speckle, and the differential propagation time cannot be resolved to better than the pulse widths of the received signals. The differential timing measurements obtained over a horizontal path are analyzed. The ocean-reflected pulse measurements obtained from the airborne two-color laser altimeter experiment are presented.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-176159 , NAS 1.26:176159 , EOSL-85-006
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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