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  • 1
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    Tradeoffs among several synthetic aperture radar image quality parameters - Results of a user survey study (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The imagery obtained with the aid of synthetic aperture radars (SAR) has been applied to several remote sensing disciplines such as geologic feature mapping, oceanic phenomena studies, and land use and urban morphology studies. The successful SAR experiment on Seasat and the Shuttle demonstrated the feasibility of global radar mapping at relatively high resolution from a spaceborn platform. The present investigation is concerned with the requirements of and the tradeoffs among several SAR image quality parameters. The results are presented from a survey study concerning the interpretability of a set of SAR images. The data used to generate these images were obtained by the Seasat SAR experiments. Attention is given to image scenes and the simulation experiment, image interpretation survey results, multiple-looks, the number of looks vs resolution, and number of bits vs resolution.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Photogrammetric Engineering and Remote Sensing (ISSN 0099-1112); 49; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of several techniques to obtain multiple-look SAR imagery (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: In order to improve image interpretability when SAR imagery is contaminated by coherent speckle noise, multiple look images are often generated. The performance levels of techniques for the generation of such multiple look imagery are presently assessed, with attention to the detailed impulse responses and signal-to-speckle noise ratios obtainable. The speckle-reduction technique considered are those of the discrete mixed integrator and the image domain filter. It is found that, by using several types of image domain filters, the signal-to-speckle noise ratio can be improved over the conventional discrete mixed integrator method's results while maintaining the equivalent rectangular resolution constant.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: (ISSN 0196-2892)
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Optical technique to study the impact of heavy rain on aircraft performance (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A laser based technique was investigated and shown to have the potential to obtain measurements of the size and velocity of water droplets used in a wind tunnel to simulate rain. A theoretical model was developed which included some simple effects due to droplet nonsphericity. Parametric studies included the variation of collection distance (up to 4 m), angle of collection, effect of beam interference by the spray, and droplet shape. Accurate measurements were obtained under extremely high liquid water content and spray interference. The technique finds applications in the characterization of two phase flows where the size and velocity of particles are needed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-177989 , NAS 1.26:177989 , SDL-85-2424-1F
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Doppler parameter estimation techniques for spaceborne SAR with applications to ocean current measurement (1982)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The problems of Doppler parameter estimation in the processing of spaceborne synthetic aperture radar (SAR) data are examined. The phase history of a target can be approximated by a linear FM signal with two parameters: the Doppler centroid and the Doppler frequency rate. Two methods to estimate these parameters automatically from the radar echo are presented. The accuracies of these methods were evaluated using the SEASAT SAR data. It is shown that the method for Doppler centroid determination may be applicable in the measurement of ocean current velocities. The concept behind this technique is presented and the accuracies of the measurements required are examined. Some preliminary results of testing this technique with the SEASAT data are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: 1982 International Geoscience and Remote Sensing Symposium; Jun 01, 1982 - Jun 04, 1982; Munich
    Format: text
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    NASA TECHNICAL REPORTS
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