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  • COMMUNICATIONS AND RADAR  (3)
  • ELECTRONIC SYSTEMS  (2)
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  • 1
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    Imaging radar polarimetry from wave synthesis (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It was shown that it is possible to measure the complete scattering matrix of an object using data acquired on a single aircraft pass, and can combine the signals later in the data processor to generate radar images corresponding to any desired combination of transmit and receive polarization. Various scattering models predict different dependence on polarization state of received power from an object. The imaging polarimeter permits determination of this dependence, which is called the polarization signature, of each point in a radar image. Comparison of the theoretical predictions and observational data yield identification of possible scattering mechanisms for each area of interest. It was found that backscatter from the ocean is highly polarized and well-modeled by Bragg scattering, while scattering from trees in a city park possesses a considerable unpolarized component. Urban regions exhibit the characteristics expected from dihedral corner reflectors and their polarization signatures are quite different from the one-bounce Bragg model.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Second Spaceborne Imaging Radar Symposium; p 174-184
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Data volume reduction for imaging radar polarimetry (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two alternative methods are presented for digital reduction of synthetic aperture multipolarized radar data using scattering matrices, or using Stokes matrices, of four consecutive along-track pixels to produce averaged data for generating a synthetic polarization image.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NAS 1.71:NPO-17184-1-CU
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Preliminary results from the NASA/JPL multifrequency, multipolarization synthetic aperture radar (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A brief description is given of the three-frequency polarimetric synthetic-aperture radar built and tested at the Jet Propulsion Laboratory. The radar has the capability to simultaneously acquire fully polarimetric data at P-, L-, and C-bands from a DC-8 airborne platform. The radar has an instantaneous data rate of approximately 2.1 Gb/s and has selectable record rates between 80-240 Mb/s. The system has a wide dynamic range featuring 8-b analog-to-digital converters and full digital floating-point processing. The processing is accomplished offline on a minicomputer system assisted by an array processor. Sample images are presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE National Radar Conference; Apr. 20, 21, 1988; Ann Arbor, MI; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Progress In Imaging Radar Polarimetry (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report traces development of imaging radar polarimetry at NASA's Jet Propulsion Laboratory during recent years. When fully developed, multipolarization synthetic-aperture radar (SAR) systems aboard aircraft and spacecraft expected to yield wealth of data for assessment of resources, agricultural forecasting, and verification of radar-scattering calculations.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17247 , NASA Tech Briefs (ISSN 0145-319X); 13; 12; P. 37
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Imaging Radar Polarimeter (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Radar measures full polarization tensor of each element in scene in one sweep. New system comprises dual-polarized antenna, single transmitter, and four-channel receiver and digital recorder installed in aircraft, plus digital processor on ground. Produces radar-backscatter images corresponding to 10- by 10-km regions on ground. Signals recorded from orthogonal linearly polarized antennas combined in computer after flight to synthesize any desired combination of transmitted and received polarizations. Data recorded on single flight processed to provide multiple images.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-16875 , NASA Tech Briefs (ISSN 0145-319X); 11; 8; P. 36
    Format: text
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    NASA TECHNICAL REPORTS
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