Precision selenodesy via differential very-long-baseline interferometry

Details Precision selenodesy via differential very-long-baseline interferometry Precision selenodesy via differential very-long-baseline interferometry

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975phdt.........6k&link_type=abstract

Ph.D. Thesis Massachusetts Inst. of Tech., Cambridge.

Physics

5

Apollo Lunar Surface Experiments Package, Differential Interferometry, Selenology, Error Analysis, Lunar Landing, Stdn (Network)

Scientific paper

The 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.

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