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  • METEOROLOGY AND CLIMATOLOGY  (279)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (263)
  • 1985-1989  (542)
  • 1
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    Nimbus-7 global cloud climatology. I - Algorithms and validation (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An improved version of the Nimbus-7 cloud retrieval algorithm was validated using data from Nimbus-7 Temperature Humidity Infrared Radiometer and Total Ozone Mapping Spectrometer to determine cloudiness parameters for the globe. Quantitative validation of total cloud amount was performed by comparing the algorithm results with estimates derived from GOES images and auxiliary meteorological data. The systematic errors of the Nimbus-7 total cloud-amount algorithm, relative to the GOES-derived estimates, were found to be less than 10 percent. The random errors of daily estimates ranged between 7 and 16 percent, day or night.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Climate (ISSN 0894-8755); 1; 445-470
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Matrix Transfer Function Design for Flexible Structures: An Application (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The application of matrix transfer function design techniques to the problem of disturbance rejection on a flexible space structure is demonstrated. The design approach is based on parameterizing a class of stabilizing compensators for the plant and formulating the design specifications as a constrained minimization problem in terms of these parameters. The solution yields a matrix transfer function representation of the compensator. A state space realization of the compensator is constructed to investigate performance and stability on the nominal and perturbed models. The application is made to the ACOSSA (Active Control of Space Structures) optical structure.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: JPL Proc. of the Workshop on Identification and Control of Flexible Space Struct., Vol. 3; p 47-62
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    NASA in-house Commercially Developed Space Facility (CDSF) study report. Volume 1: Concept configuration definition (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of a NASA in-house team effort to develop a concept definition for a Commercially Developed Space Facility (CDSF) are presented. Science mission utilization definition scenarios are documented, the conceptual configuration definition system performance parameters qualified, benchmark operational scenarios developed, space shuttle interface descriptions provided, and development schedule activity was assessed with respect to the establishment of a proposed launch date.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-101586-VOL-1 , NAS 1.15:101586-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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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
  • 5
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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
  • 6
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    Articulated Space Station controllability assessment (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Reference Space Station design under consideration by NASA will contain several articular components, notably solar arrays and radiators. A technique to model articulation for use in determining Space Station controllability is described. The technique involves treating each articular component as a rigid free body, subject to the constraint of being attached to the Space Station proper. Because of the relatively large areas associated with some of the articular components, the resulting aerodynamics and solar radiation pressure induced forces and torques are shown to be significant. The effects of articulation on Space Station controllability as compared to the non-articulated rigid-body model are demonstrated. Plots of control forces and torques required to maintain orbital altitude and vehicle attitude are presented.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 85-0024
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Atmospheric deployment of tethered systems - The proposed TSS-2 flight demonstration (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-14
    Description: Areas of strong user interest in the atmospheric deployment of tethered systems are addressed. They include hypersonic and aerothermodynamics research to support next-generation aerospace vehicle design, lower thermosphere scientific research supporting global change monitoring and earth systems investigations, and payload recovery/trash disposal from Space Station Freedom. The proposed tethered flight demonstration TSS-2 is described.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: IAF PAPER 89-062
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The solar dynamic radiator with a historical perspective (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A historical perspective on pumped-fluid loop space radiators provides a basis for the design of the Space Station Solar Dynamic (SD) power module radiator. SD power modules, capable of generating 25 kW (electrical) each, are planned for growth in Station power requirements. The Brayton cycle SD module configuration incorporates a pumped-fluid loop radiator that must reject up to 99 kW (thermal). The thermal/hydraulic design conditions in combination with required radiator orientation and packaging envelope form a unique set of constraints as compared to previous pumped-fluid loop radiator systems. Nevertheless, past program successes have demonstrated a technology base that can be applied to the SD radiator development program to ensure a low risk, low cost system.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-100972 , E-4265 , NAS 1.15:100972 , Intersociety Energy Conversion Engineering Conference; Jul 31, 1988 - Aug 05, 1988; Denver, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Neutralization of beam-emitting spacecraft by plasma injection (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An impulsive plasma injection has been used to study charge neutralization of the Space Shuttle Orbiter while it was emitting an electron beam into space. This investigation was performed by Space Experiments with Particle Accelerators on Spacelab-1. A plasma consisting of 10 to the 19th argon ion-electron pairs was injected into space for 1 ms while an electron beam was also being emitted into space. The electron beam energy and current were as high as 5 keV and 300 mA. While the orbiter potential was positive before the plasma injection and began to decrease during the plasma injection, it was near zero for 6 to 20 ms after the plasma injection. The recovery time to the initial level of charging varied from 10 to 100 ms. In a laboratory test in a large space chamber using the same flight hardware, the neutralization time was 8-17 ms and the recovery time was 11-20 ms. The long duration of the neutralization effect in space can be explained by a model of diffusion of the cold plasma which is produced near the Orbiter by charge exchange between the neutral argon atoms and the energetic argon ions during plasma injection.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 24; 227-231
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    NASA TECHNICAL REPORTS
  • 10
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    Spatial and temporal characteristics of global cloud cover as observed from the Nimbus-7 satellite (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The spatial and temporal characteristics of the total cloud amount (TCA) were determined on the bases of 2 yr of data collected by Nimbus-7. The instruments used were the 11.5 microns channel of the Temperature Humidity IR radiometer and the 0.38 micron channel of the Total Ozone Mapping Spectrometer. Comparisons were made between long-term averages and large variations during the El Nino/Southern Oscillation event of 1982/83. Separate attention was also given to the TCA for the Northern and Southern Hemispheres, and to TCA averages over specific large-scale global features such as deserts.
    Keywords: METEOROLOGY AND CLIMATOLOGY
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