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  • 1
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    Angular radiation models for Earth-atmosphere system. Volume 1: Shortwave radiation (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Presented are shortwave angular radiation models which are required for analysis of satellite measurements of Earth radiation, such as those fro the Earth Radiation Budget Experiment (ERBE). The models consist of both bidirectional and directional parameters. The bidirectional parameters are anisotropic function, standard deviation of mean radiance, and shortwave-longwave radiance correlation coefficient. The directional parameters are mean albedo as a function of Sun zenith angle and mean albedo normalized to overhead Sun. Derivation of these models from the Nimbus 7 ERB (Earth Radiation Budget) and Geostationary Operational Environmental Satellite (GOES) data sets is described. Tabulated values and computer-generated plots are included for the bidirectional and directional modes.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-RP-1184 , L-16414 , NAS 1.61:1184
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Angular radiation models for earth-atmosphere system. Volume 2: Longwave radiation (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The longwave angular radiation models that are required for analysis of satellite measurements of Earth radiation, such as those from the Earth Radiation Budget Experiment (ERBE) are presented. The models contain limb-darkening characteristics and mean fluxes. Limb-darkening characteristics are the longwave anisotropic factor and the standard deviation of the longwave radiance. Derivation of these models from the Nimbus 7 ERB (Earth Radiation Budget) data set is described. Tabulated values and computer-generated plots are included for the limb-darkening and mean-flux models.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-RP-1184-VOL-2 , L-16503 , NAS 1.61:1184-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Parallel fault-tolerant robot control (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A shared memory multiprocessor architecture is used to develop a parallel fault-tolerant robot controller. Several versions of the robot controller are developed and compared. A robot simulation is also developed for control observation. Comparison of a serial version of the controller and a parallel version without fault tolerance showed the speedup possible with the coarse-grained parallelism currently employed. The performance degradation due to the addition of processor fault tolerance was demonstrated by comparison of these controllers with their fault-tolerant versions. Comparison of the more fault-tolerant controller with the lower-level fault-tolerant controller showed how varying the amount of redundant data affects performance. The results demonstrate the trade-off between speed performance and processor fault tolerance.
    Keywords: CYBERNETICS
    Type: In: Cooperative intelligent robotics in space III; Proceedings of the Meeting, Boston, MA, Nov. 16-18, 1992 (A93-29101 10-54); p. 251-261.
    Format: text
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    NASA TECHNICAL REPORTS
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