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  • 1
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    Multifrequency, Multipolarization External Calibration of the SIR-C/X-SAR Radars (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Progress and the future plans for the following objectives are discussed: (1) Assess the accuracy at which the SIR-C/X-SAR standard data products can be calibrated through the use of ground calibrators to estimate the end-to-end system polarization calibration constants (or distortion parameters) and incorporate the constants into the data processing; (2) Study the cross-calibration between three multipolarization systems: SIR-C, the National Aeronautics and Space Administration/Jet Propulsion Laboratory (NASA/JPL) DC-8 SAR, and the University of Michigan ground-based polarimetric scatterometer; (3) Evaluate the calibration "stability" of SIR-C/X-SAR (measured by variations in the calibration constants) over the range swath width and over a specified distance in azimuth. Variations over a 12-hour period (between ascending and descending passes) will also be studied; and (4) Develop a cost-effective calibration plan including development of inexpensive polarimetric active calibrators.
    Keywords: Communications and Radar
    Type: Science Results from the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR): Progress Report; 55-57; NASA/CR-97-206707
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  • 2
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    The "Myth" of the Minimum SAR Antenna Area Constraint (1998)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A design constraint traceable ot the early days of spaceborne Synthetic Aperture Radar (SAR) is known as the minimum antenna area constraint for SAR. In this paper, it is confirmed that this constraint strictly applies only to the case where both the best possible resolution and the widest possible swath are the design goals. SAR antennas with area smaller than the constraint allows are shown to be possible, have been used on spaceborne SAR missions in the past, and should permit further, lower-cost SAR mission in the future.
    Keywords: Communications and Radar
    Format: application/pdf
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  • 3
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    Fitting a Two-Component Scattering Model to Polarimetric SAR Data (1998)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Classification, decomposition and modeling of polarimetric SAR data has received a great deal of attention in the recent literature. The objective behind these efforts is to better understand the scattering mechanisms which give rise to the polarimetric signatures seen in SAR image data. In this Paper an approach is described, which involves the fit of a combination of two simple scattering mechanisms to polarimetric SAR observations. The mechanisms am canopy scatter from a cloud of randomly oriented oblate spheroids, and a ground scatter term, which can represent double-bounce scatter from a pair of orthogonal surfaces with different dielectric constants or Bragg scatter from a moderately rough surface, seen through a layer of vertically oriented scatterers. An advantage of this model fit approach is that the scattering contributions from the two basic scattering mechanisms can be estimated for clusters of pixels in polarimetric SAR images. The solution involves the estimation of four parameters from four separate equations. The model fit can be applied to polarimetric AIRSAR data at C-, L- and P-Band.
    Keywords: Communications and Radar
    Format: application/pdf
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  • 4
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    SAR Applications in the 21st Century (1995)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: SAR image data from a variety of spaceborne and airborne sensors will be much more.
    Keywords: Communications and Radar
    Type: German International Journal of Electronics and Communications
    Format: text
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  • 5
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    Radar Images of the Earth and the World Wide Web (1995)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: A perspective of NASA's Jet Propulsion Laboratory as a center of planetary exploration, and its involvement in studying the earth from space is given. Remote sensing, radar maps, land topography, snow cover properties, vegetation type, biomass content, moisture levels, and ocean data are items discussed related to earth orbiting satellite imaging radar. World Wide Web viewing of this content is discussed.
    Keywords: Communications and Radar
    Type: Earth Magazine
    Format: text
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  • 6
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    Achievements in the Development of Space-borne Imaging Radar (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: This article describes past and current achievements in the development of space-borne imaging radar technology and discusses possibilities for the future. The article focuses on space-borne capabilities for civil and scientific purposes.
    Keywords: Communications and Radar
    Type: IEEE Aerospace and Electronic Systems; United States
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  • 7
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    The Second SIR-C Education CD-ROM (1994)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Communications and Radar
    Format: text
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  • 8
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    The JERS-1 Amazon Multi-Season Mapping Study (JAMMS) (1996)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Regional mapping of the Amazon basin using imaging radar is described. Two 60-day periods of radar mapping will be conducted, one in 1995, and one in 1996. One period will view the low-water season, and the other will view during the high-flood season. The main objective of the JAMMS project is to generate a regional map showing inundation throughout the Amazon Basin by comparing the two data sets.
    Keywords: Communications and Radar
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  • 9
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    NASA/JPL's Imaging Radar Outreach Program (1996)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: In order to build a user community for future NASA imaging radar products and programs, outreach activities have been implemented by JPL. These include: education outreach, public awareness outreach, and outreach to areas of the scientific and applications community who are not traditional imaging radar users. A key component is the NASA/JPL Imaging Radar Home Page on the World Wide Web.
    Keywords: Communications and Radar
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  • 10
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    Mapping Angkor with AIRSAR/TOPSR Data (1997)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: During last year's AIRSAR Pacific Rim Deployment, data were collected over Angkor in Cambodia. The temples of Angkor date the city to the 9th-13th century AD, but little is known of its prehistoric habitation.
    Keywords: Communications and Radar
    Format: text
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