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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • GEOPHYSICS  (2)
  • 1985-1989  (1)
  • 1975-1979  (3)
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  • 1
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    Precision surveying using very long baseline interferometry (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Radio interferometry measurements were used to measure the vector baselines between large microwave radio antennas. A 1.24 km baseline in Massachusetts between the 36 meter Haystack Observatory antenna and the 18 meter Westford antenna of Lincoln Laboratory was measured with 5 mm repeatability in 12 separate experiments. Preliminary results from measurements of the 3,928 km baseline between the Haystack antenna and the 40 meter antenna at the Owens Valley Radio Observatory in California are presented.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-TM-X-71405 , X-922-77-242 , Ann. Meeting of the Am. Soc. of Civil Engr.; Oct 17, 1977 - Oct 21, 1977; San Francisco
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Geodetic and Astrometric Measurements with Very-Long-Baseline Interferometry (1975)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The use of very-long-baseline interferometry (VLBI) observations for the estimation of geodetic and astrometric parameters is discussed. Analytic models for the dependence of delay and delay rate on these parameters are developed and used for parameter estimation by the method of weighted least squares. Results are presented from approximately 15,000 delay and delay-rate observations, obtained in a series of nineteen VLBI experiments involving a total of five stations on two continents. The closure of baseline triangles is investigated and found to be consistent with the scatter of the various baseline-component results. Estimates are made of the wobble of the earth's pole and of the irregularities in the earth's rotation rate. Estimates are also made of the precession constant and of the vertical Love number, for which a value of 0.55 + or - 0.05 was obtained.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-TM-X-71395 , X-922-77-228
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Possible detection of the earth's free-core nutation (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: The 5.5 years of VLBI observations primarily collected under project IRIS are used to search for evidence of the free-core nutation (FCN). The observations are consistent with an irregular excitation process, and a model which assumes a step excitation in the FCN amplitude to about 2.0 milliseconds of arc in late 1985 fits the data well. Theoretical analysis appears to rule out the strong Mexican earthquake of September 19, 1985, as a cause of the excitation.
    Schlagwort(e): GEOPHYSICS
    Materialart: Geophysical Research Letters (ISSN 0094-8276); 13; 949-952
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Recent results of radio interferometric determinations of a transcontinental baseline, polar motion, and earth rotation (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Results are discussed for radio interferometric observations of extragalactic radio sources with antennas at Haystack Observatory in Massachusetts and the Owens Valley Radio Observatory in California (3900-km baseline) during 14 separate experiments distributed between September 1976 and May 1978. Simultaneous analysis of the data from several experiments yields estimates of changes in the x component of pole position and in earth's rotation (UT1). Comparison with the corresponding results obtained by the Bureau International de l'Heure (BIH) reveals systematic differences. In particular, the trends in the radio interferometric determinations of the changes in pole position are found to agree more closely with those from the International Polar Motion Service and from Doppler observations of satellites than with those from the BIH.
    Schlagwort(e): GEOPHYSICS
    Materialart: Time and the earth''s rotation; Eighty-second Symposium; May 08, 1978 - May 12, 1978; San Fernando; Spain
    Format: text
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    NASA TECHNICAL REPORTS
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