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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • 1975-1979  (2)
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  • 1
    Publication Date: 2019-07-13
    Description: 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.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: 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
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  • 2
    Publication Date: 2019-06-27
    Description: 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.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-X-71395 , X-922-77-228
    Format: application/pdf
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