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Precision Selenodesy via Differential Very-Long-Baseline InterferometryThe technique of differential very-long baseline interferometry was used to measure the relative positions of the ALSEP transmitters at the Apollo 12, 14, 15, 16, and 17 lunar landing sites with uncertainties less than 0.005 of geocentric arc. These measurements yielded improved determinations of the selenodetic coordinates of the Apollo landing sites, and of the physical libration of the moon. By means of a new device, the differential Doppler receiver (DDR), instrumental errors were reduced to less than the equivalent of 0.001. DDRs were installed in six stations of the NASA spaceflight tracking and data network and used in an extensive program of observations beginning in March 1973.
Document ID
19750023913
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
King, R. W., Jr.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1975
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
NASA-CR-143452
Accession Number
75N31986
Funding Number(s)
CONTRACT_GRANT: NAS5-11947
CONTRACT_GRANT: NSG-7010
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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