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  • Other Sources  (2)
  • LAUNCH VEHICLES AND SPACE VEHICLES  (1)
  • PHYSICAL SCIENCES  (1)
  • Earth Resources and Remote Sensing
  • GENERAL
  • 2015-2019
  • 1990-1994  (2)
  • 1991  (2)
  • 1
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    Advanced manned launch system study status (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Various concepts for advanced manned launch systems (AMLS) are examined for delivery missions to Space Station and polar orbit. Included are single- and two-stage winged systems with rocket and/or airbreathing propulsion systems. For near-term technologies, two-stage, reusable rocket systems are favored over single-stage rocket or airbreathing/rocket systems. Advanced technologies enable viable single-stage-to-orbit (SSTO) concepts. Although two-stage rocket systems continue to be lighter in dry weight than SSTOs, advantages in simpler operations may make SSTOs more cost-effective over the life cycle. Generally, rocket systems maintain a dry weight advantage over airbreathing systems at advanced technology levels, but to a lesser degree than when near-term technologies are used. More detailed understanding of vehicle systems and associated ground and flight operations requirements and procedures is essential in determining quantitative discrimination between these latter concepts.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: IAF PAPER 91-193
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Improved Radiometric Correction For SAR Images (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Correction algorithm reversible and applicable to both detected and complex images. Method described accounts for major effects of transmitter, antenna, receiver, and certain aspects of SAR signal processing upon calibration and provides for appropriate reversible corrections applied in processing. Applicable to both detected (amplitude-only) and complex (amplitude and phase) SAR image data and provides for optional subtraction of estimated noise floor from image.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17931 , NASA Tech Briefs (ISSN 0145-319X); 15; 10; P. 37
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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