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  • 1
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    Target Simulator for Synthetic-Aperture Radars (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In proposed Target Simulator for Testing Synthetic-Aperture Radars, radar transmitter output received, mixed down to video frequencies, and passed through variable digital delay. Delayed signal mixed up to original carrier frequency and transmitted back to radar. Synthetic-aperture radar (SAR) generates return signal that contains range-curvature information in addition to Doppler-frequency information.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-15024 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 471
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Radar Polarimeter Measures Orientations Of Retroreflectors (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Polarization signatures of targets compared with known signatures at known angles. Experiments demonstrated use of radar polarimetry to measure orientation of retroreflective target, even though target much smaller than resolution element of radar. Technique based on comparison of angular dependencies of measured and theoretically derived polarization signatures of target. Polarization signature also used to identify target. Tilt of reflector inferred by finding angle minimizing measure of difference between theoretical and measured radar cross sections of reflector.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17231 , NASA Tech Briefs (ISSN 0145-319X); 13; 7; P. 37
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Compression Of Data In Imaging Radar Polarimetry (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Algorithms developed to reduce number of radar polarimetric data processed to synthesize image of arbitrary combination of transmitting and receiving polarizations. Brings image-processing requirements within computing capabilities of typical users, without degrading images excessively. In scattering-matrix approach to reduction of image data, four adjacent picture elements combined into one by synthesizing new scattering matrix from scattering matrices of four elements. In phase-matrix approach, phase matrices generated from scattering matrices of four adjacent picture elements, and four phase matrices added to combine four picture elements into one.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: NPO-17184 , NASA Tech Briefs (ISSN 0145-319X); 13; 2; P. 90
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 4
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    Radar Detects Ocean Surface Currents (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Interferometric system uses reflections from ripples. Experimental airborne interferometric synthetic-aperture radar system measures line-of-sight component of velocity of ripples on surface of ocean. With help of suitable assumptions about relationships among ripples, larger waves or swells on which they occur, and overall movement of water, component of velocity of underlying surface current perpendicular to path of airplane deduced.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17192 , NASA Tech Briefs (ISSN 0145-319X); 12; 11; P. 34
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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