Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991itim...40..584d&link_type=abstract
IEEE Transactions on Instrumentation and Measurement (ISSN 0018-9456), vol. 40, June 1991, p. 584-590.
Physics
1
Microwave Transmission, Radio Communication, Radio Telescopes, Signal Processing, Spaceborne Telescopes, Very Long Base Interferometry, Downlinking, Ground Stations, Signal To Noise Ratios, Uplinking
Scientific paper
Orbiting VLBI based on radio transmission of a reference signal from an earth-bound oscillator is considered. This method provides the possibility of forming a connected-element interferometer between the spacecraft and an earth radio telescope co-located with the reference oscillator. The reference signal from the spacecraft to the earth is retransmitted and the round-trip time is continuously measured by assuming reciprocity of the path; the time at the spacecraft is always known relative to a clock on the earth. The present study is concerned with the design of such a round-trip reference system and its accuracy limitations. Spacecraft and earth station models, continuous contact and simple-frequency timing, ambiguity-free timing link design, and the onboard synthesizers are discussed. A design example is presented.
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