ALSEP: Quasar differential VLBI

Details ALSEP: Quasar differential VLBI ALSEP: Quasar differential VLBI

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976dsnpr..33...37s&link_type=abstract

In its The Deep Space Network p 37-54 (SEE N76-27262 18-12)

Computer Science

Apollo Lunar Experiment Module, Celestial Reference Systems, Deep Space Network, Differential Interferometry, Data Links, Extragalactic Radio Sources, Ground Support Systems, Lunar Communication, Space Flight Tracking And Data Network

Scientific paper

A program of Apollo Lunar Surface Experiments Package (ALSEP)-Quasar Very Long Baseline Interferometry (VLBI) is being reported. These observations primarily employ a 4 antenna technique, whereby simultaneous observations with two antennas at each end of an intercontinental baseline are used to derive the differential interferometric phase between a compact extragalactic radio source (usually a quasar) and a number of ALSEP transmitters on the lunar surface. A continous ALSEP-quasar differential phase history over a few hour period leads to extremely high angular accuracy in measuring the lunar position against the quasar reference frame. This application of the 4 antenna technique has been underway for more than a year and is now producing high quality data utilizing Deep Space Network (DSN) stations in Australia, Spain, and Goldstone, California, as well as the Spaceflight Tracking and Data Network (STDN) Apollo station at Goldstone.

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