NDLI: Very long baseline interferometry using a radio telescope in earth orbit

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Very long baseline interferometry using a radio telescope in earth orbit

Content Provider	NASA Technical Reports Server (NTRS)
Author	Linfield, R. P. Edwards, C. D. Ulvestad, J. S.
Copyright Year	1987
Description	Successful Very Long Baseline Interferometry (VLBI) observations at 2.3 GHz were made using an antenna aboard an Earth-orbiting spacecraft as one of the receiving telescopes. These observations employed the first deployed satellite (TDRSE-E for East) of the NASA Tracking and Data Relay Satellite System (TDRSS). Fringes were found for 3 radio sources on baselines between TDRSE and telescopes in Australia and Japan. The purpose of this experiment and the characteristics of the spacecraft that are related to the VLBI observations are described. The technical obstacles to maintaining phase coherence between the orbiting antenna and the ground stations, as well as the calibration schemes for the communication link between TDRSE and its ground station at White Sands, New Mexico are explored. System coherence results and scientific results for the radio source observations are presented. Using all available calibrations, a coherence of 84% over 700 seconds was achieved for baselines to the orbiting telescope.
File Size	620821
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870008511
Archival Resource Key	ark:/13960/t83j8c08w
Language	English
Publisher Date	1987-02-15
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Data Links Errors Very Long Base Interferometry Radio Telescopes Tdr Satellites Spaceborne Telescopes Data Correlation Oscillators Spacecraft Motion Antennas Earth Orbits Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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