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  • Other Sources  (7)
  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING  (4)
  • ASTRODYNAMICS  (3)
  • Superfluidity and superconductivity
  • 1
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    Round-trip missions to low delta-V asteroids and implications for material retrieval (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Low-delta-V asteroids are to be found among those which have perihelia near 1 AU. From the 50 known asteroids with perihelia less than 1.5 AU, 10 candidates for asteroid retrieval missions were selected on the basis of low eccentricity and inclination. To estimate the ranges of orbital elements for which capture in earth orbit may be feasible, a survey was made of 180 deg transfer from a set of orbits having elements near those of the earth to the earth. For 2 of the 10 low-delta-V asteroids and for an additional one with elements more earth-like than any yet known, direct ballistic round trips in the 1980's were computed. A stay time of several months at the asteroid was used. The results show that the total delta V, including that for rendezvous with earth upon return, for the known asteroids is above 14 km/sec. But if asteroids are found similar to the strawman considered, the total delta V could be as low as 10 km/sec.
    Keywords: ASTRODYNAMICS
    Type: NASA. Ames Res. Center Space Resources and Space Settlements; p 161-172
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mark 4-A DSCC (Magellan-era) telemetry system description (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An update to the description of the Deep Space Communications Complex portion of the Mark 4-A Telemetry system is given. This system is currently implemented at all signal processing centers. The upgrade of the telemetry system was undertaken primarily in support of the Voyager-Neptune Encounter and the Magellan mission. The Mark 3 Telemetry System is the predecessor of the Mark 4-A system.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Telecommunications and Data Acquisition Report; p 263-273
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Mark 4-A DSCC telemetry system description (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An update is provided to the description of the Deep Space Communications Complex (DSSCC) portion of the MK IV-A Telemetry System. This system is currently being implemented at all signal processing centers. The Mark III Telemetry System is the predecessor of the Mark IV-A System.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Telecommunications and Data Acquisition Report; p 92-100
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Seasat synthetic aperture radar - Ocean wave detection capabilities (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A preliminary assessment has been made of the capability of the Seasat synthetic aperture radar to detect ocean waves. Comparison with surface and aircraft measurements from five passes of the satellite over the Gulf of Alaska indicates agreement to within about 15 percent in wavelength and about 25 deg in wave direction. These results apply to waves 100 to 250 meters in length, propagating in a direction predominantly across the satellite track, in sea states with significant wave height in a range of 2 to 3.5 meters.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Science; 204; June 29
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Seasat scanning multichannel microwave radiometer - Results of the Gulf of Alaska workshop (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Scanning multichannel microwave radiometer results obtained by the Gulf of Alaska Seasat Experiment Workshop are reported. The Seasat SMMR provided data from five channels operating at 6.6, 10.7, 18, 21, and 37 GHz at vertical and horizontal polarizations. Two preliminary algorithms were used to retrieve geophysical parameters from the data: the Wentz algorithm (Bierman et al., 1978) based on a theoretically derived function for computing brightness temperatures and the Wilheit algorithm, based on statistical relationships between brightness temperatures and the geophysical parameters obtained from an ensemble of realistic sea-surface temperature values, wind speeds, atmospheric temperature profiles, water vapor profiles and cloud models. In spite of the immaturity of the data-processing algorithms, results are encouraging. For open ocean, rain-free cells of high-quality surface truth wind determinations display standard deviations of 3 m/sec about a bias of 1.5 m/sec. The sea-surface temperature exhibits a standard deviation of about 1.5 deg C about a bias of 3 to 5 deg C under a variety of meteorological conditions.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Science; 204; June 29
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Optimal orbital transfers and prime rib curves for mission design (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Battin's work on optimal one impulse transfers from circular orbits is extended. Optimal one impulse trajectories from orbits of arbitrary eccentricity through a specified point are determined. This work is then further extended to optimal two impulse transfers between massive planets. Curves derived using this technique are presented showing flyby and rendezvous Delta V requirements for all combinations of launch and arrival true anomalies. Similar curves for times of flight corresponding to the trajectories with minimum total Delta V are derived using Lambert's methods. Possible further extension of these techniques are outlined. The use of these curves for mission design is presented in a companion paper by Hulkower and Ross (1971).
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 81-0313 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; St. Louis, MO
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    NASA TECHNICAL REPORTS
  • 7
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    Material capture by double lunar gravity assist (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The equations yielding the performance of a single lunar flyby in removing incoming hyperbolic excess velocity to capture payloads on interplanetary trajectories are briefly derived. The impossibility of using a single lunar flyby to capture a body entering the earth-moon system with a hyperbolic velocity in excess of about 1.9 km/s is discussed, and a method of using a double flyby of the moon to significantly improve this performance is developed. The equations for achieving a double lunar flyby are derived by solving the orbital equations and Lambert's problem both for the incoming trajectory in the plane of the moon's orbit and for arbitrary declination. For the in-plane case it is shown that the maximum removable hyperbolic excess velocity is 2.2687 km/s. For the inclined case, it is shown that the use of a double lunar flyby allows capture for declinations in excess of 54 degrees, and that for declinations less than 38 degrees the double lunar flyby offers better performance than the single lunar flyby.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 80-1673 , Astrodynamics Conference; Aug 11, 1980 - Aug 13, 1980; Danvers, MA
    Format: text
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    NASA TECHNICAL REPORTS
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