Computer Science
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.160...37f&link_type=abstract
In ESA Spacecraft Flight Dyn. p 37-45 (SEE N82-14123 05-12)
Computer Science
Gravitational Fields, Lunar Far Side, Lunar Gravitation, Lunar Observatories, Satellite Tracking, Doppler Radar, Lunar Orbiter, Magnetic Poles, Moments Of Inertia, Orbiting Lunar Stations, Relay Satellites
Scientific paper
Lunar gravitational field determination is reviewed and the Polar Orbiting Lunar Observatory gravity experiment is discussed. The mission baseline comprises two spacecraft; the Orbiter in a low altitude near circular polar orbit and the Relay in a high altitude trajectory. The two spacecraft allow Doppler tracking on the lunar farside (via Relay) and improve coverage in the polar regions. Covariance analysis shows that processing of Relay Doppler data permits an order of magnitude improvement in the precision of the polar moment of inertia parameter. Daily tracking sessions of 2 hours over 27 days are required. Doppler data accurate from 1 to 2 mm/sec is essential.
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