出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Since the launch of Sputnik in 1957, spacecraft have been routinely tracked within the Solar System
by radio telescope. An interferometric technique known as Delta-DOR determines positions
of spacecraft with milliarcsecond precision. We have been developing a technique for doing VLBI
on spacecraft signals, which differ importantly from natural sources. Such a capability could provide
relative astrometric precision at the microarcsecond level. We will describe the technique
and present results obtained from observations of the Huygens probe landing on Titan (January
2005) and the impact of the SMART-1 spacecraft on the Moon (September 2006).
