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  • 11
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    Apollo 15 laser altimeter, part D (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The laser altimeter, consisting of a Q switched ruby laser, transmitting optics, counting timer, receiving optics, and a photomultiplier is described. Harmonic analysis of the mission data is also presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Manned Spacecraft Center Apollo 15 Prelim. Sci. Rept.; 2 p
    Format: text
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  • 12
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    Apollo 17 laser altimeter (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The performance and operation of the Apollo 17 laser altimeter after several modifications are discussed. Functions of the instrument include precise altitude measurement of the CSM above the lunar surface, and measurement of broad scale topographic relief around the entire circumference of the moon.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Apollo 17 Prelim. Sci. Rept.; 4 p
    Format: text
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  • 13
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    Benefits to the study of oceanic tectonics expected from Seasat-A (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A more detailed gravity field such as provided by the SEASAT-A altimeter would help resolve several problems of marine geology, such as the relationship of spreading rises to convective upstreams and the tectonics of subduction zones and the associated marginal basins. In addition, the gravity field should be measured in more detail over continental shelves accessible to mineral exploration. A secondary contribution of SEASAT-A would be to sedimentation processes, through its influence on models of ocean currents.
    Keywords: OCEANOGRAPHY
    Type: NASA, Washington Seasat-A Sci. Contrib.; p 70-73
    Format: text
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  • 14
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    A study to prepare a preliminary analysis and design definition of a drag-free satellite for geodynamics (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: GENERAL
    Type: NASA-CR-131979
    Format: application/pdf
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  • 15
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    Potentialities of lunar laser ranging for measuring tectonic motions. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The lunar laser-ranging system at McDonald Observatory, Texas, is currently attaining accuracies of plus or minus 15 cm, and plus or minus 3 cm appears feasible. Numerical error analyses containing 97 parameters (35 of them for error sources) indicate that the plus or minus 3 cm system would measure station motions to plus or minus 1 cm/year accuracy within a year for east-west motions and within about 3 years for north-south. Furthermore, the correlations of station motions with other parameters are low, so that it is unlikely that the estimate is too optimistic because of modeling inadequacies of the error analysis.
    Keywords: GEOPHYSICS
    Format: text
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  • 16
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    Lunar physical librations and laser ranging (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The analysis of lunar laser ranging data requires very accurate calculations of the lunar physical librations. Libration terms are given which arise from the additive and planetary terms in the lunar theory. The large size of the recently discovered terms due to third degree gravitational harmonics will allow some of these harmonics to be measured by laser ranging to the moon. Numerical integration promises to be an effective method of calculating librations. Comparison of numerical integrations with analytic series indicates that the calculation of the series due to third and fourth degree harmonics is not yet as accurate as the more extensively developed second degree terms.-
    Keywords: SPACE SCIENCES
    Format: text
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  • 17
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    The physical librations of the moon, including higher harmonic effects (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The equations of the physical libration of the moon are developed using a representation of the earth-moon orbit as a Kepler ellipse referred to the lunar equator and expanding the lunar potential in terms of these Kepler elements. The Improved Lunar Ephemeris is used to calculate solar perturbations, and a linear integration of all effects arising from lunar gravitational harmonics through the fourth degree is performed. Aside from unobservable constant offsets of the principal axes, the main effects of the higher harmonics on longitude are: 10-sec six-yearly (argument omega), 1.2-sec three-yearly, 0.5-sec annual, and 0.1-sec monthly; on pole direction they are on the order of 0.5-sec six-yearly and 1.0-sec monthly. The higher harmonics must hence be taken into account in analyzing ranging data of 10 cm accuracy.
    Keywords: SPACE SCIENCES
    Type: The Moon; 8; Sept
    Format: text
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  • 18
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    Error analysis for station position from tracking of the Lageos satellite (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The earth physics satellite systems error analysis program was applied to the problem of predicting the relative accuracy of station position determinations under varying orbital and observing geometries. The reference case consists of nine ground stations extending over 1500 km which lasers ranged to a LAGEOS satellite, with simultaneous Doppler tracking from a geosynchronous satellite for 16 days. Eleven variations from the reference case were tested. The results showed little sensitivity to whether the LAGEOS altitude is 3700 or 5690 km. More significant were the high inclination, and that LAGEOS was tracked by a geosynchronous satellite.
    Keywords: GEOPHYSICS
    Type: NASA-CR-140118
    Format: application/pdf
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  • 19
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    Dynamical aspects of lunar origin (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Lunar origin dynamics, discussing orbit evolution by tidal friction and celestial mechanical theory
    Keywords: SPACE SCIENCES
    Type: ; YAL SOCIETY (
    Format: text
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  • 20
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    Tidal theory and orbital perturbations (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Linking ocean tides to satellite orbits
    Keywords: GEOPHYSICS
    Type: NASA-CR-121641
    Format: application/pdf
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