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  • 1
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    Low-rate communications utilizing digital coding and modulation (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: All digital communications signal design using convolutional coding and PSK modulation for two-way transmission of voice and data between space shuttle and ground
    Keywords: COMMUNICATIONS
    Type: Proc. of the Space Shuttle Integrated Electron. Conf., Vol. 2; p 291-310
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Transition flight experiments on a swept wing with suction (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Flight experiments were conducted on a 30 degree swept wing with a perforated leading edge by systematically varying the location and amount of suction over a range of Mach number and Reynolds number. Suction was varied chordwise ahead of the front spar from either the front or rear direction by sealing spanwise perforated strips. Transition from laminar to turbulent flow was due to leading edge turbulence contamination or crossflow disturbance growth and/or Tollmien-Schlichting disturbance growth, depending on the test configuration, flight condition, and suction location. A state-of-the-art linear stability theory which accounts for body and streamline curvature and compressibility was used to study the boundary layer stability as suction location and magnitude varied. N-factor correlations with transition location were made for various suction configurations.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 89-1893
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Effects of transmitted noise on receiver signal-to-noise ratios (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Effects of transmitted noise on receiver signal to noise ratios
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-65018
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Transition Flight Experiments on a Swept Wing With Suction (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Flight experiments were conducted on a 30 degree swept wing with a perforated leading edge by systematically varying the location and amount of suction over a range of Mach number and Reynolds number. Suction was varied chordwise ahead of the front spar from either the front or rear direction by sealing spanwise perforated strips. Transition from laminar to turbulent flow was due to leading edge turbulence contamination or crossflow disturbance growth and/or Tollmien-Schlichting disturbance growth-depending on the test configuration, flight condition, and suction location. A state-of-the-art linear stability theory which accounts for body and streamline curvature and compressibility was used to study the boundary layer stability as suction location and magnitude varied. N-factor correlations with transition location were made for various suction configurations.
    Keywords: Aerodynamics
    Type: AIAA Paper 89-1893 , AIAA 20th Fluid Dynamics, Plasma Dynamics and Lasers Conference; Jun 12, 1989 - Jun 14, 1989; Buffalo, NY; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Shuttle Orbiter Uplink Text and Graphics System (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper presents the definition of requirements for and current design of the Shuttle Orbiter Uplink Text and Graphics System (UT&GS). Beginning in early 1981, the UT&GS will support Shuttle flights by providing the capability of transmitting single-frame imagery from the ground to the orbiting Shuttle vehicle. Such imagery is in the form of maps, text, diagrams, or photographs, and is outputted on the Orbiter as a paper hard copy. Four modes of operation will be provided to minimize the time required to transmit less than full-resolution imagery. This paper discusses the considerations and complications leading to the four modes and associated resolution requirements. The paper also presents the design of the CCD array ground scanner and airborne CRT hardcopier.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: NTC ''78; National Telecommunications Conference; Dec 03, 1978 - Dec 06, 1978; Birmingham, AL
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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