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  • COMMUNICATIONS AND RADAR  (2)
  • 1
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    Effect of surface roughness on the microwave emission from soils (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of surface roughness on the brightness temperature of a moist terrain was studied through the modification of Fresnel reflection coefficient and using the radiative transfer equation. The modification involves introduction of a single parameter to characterize the roughness. It is shown that this parameter depends on both the surface height variance and the horizontal scale of the roughness. Model calculations are in good quantitative agreement with the observed dependence of the brightness temperature on the moisture content in the surface layer. Data from truck mounted and airborne radiometers are presented for comparison. The results indicate that the roughness effects are greatest for wet soils where the difference between smooth and rough surfaces can be as great as 50K.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-79606
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A survey of airborne radar systems for deployment on a High Altitude Powered Platform (HAPP) (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A survey was conducted to find out the system characteristics of commercially available and unclassified military radars suitable for deployment on a stationary platform. A total of ten domestic and eight foreign manufacturers of the radar systems were identified. Questionnaires were sent to manufacturers requesting information concerning the system characteristics: frequency, power used, weight, volume, power radiated, antenna pattern, resolution, display capabilities, pulse repetition frequency, and sensitivity. A literature search was also made to gather the system characteristics information. Results of the survey are documented and comparisons are made among available radar systems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-156860 , CSC-TM-79-6294
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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