Space missions: Very-long-baseline interferometry takes to the sky
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چکیده
منابع مشابه
Space Very Long Baseline Interferometry (SVLBI) Mission Operations
The first space very long baseline interferometry (SVLBI) mission—the VLBI Space Observatory Program (VSOP)—using an 8-m telescope in orbit, has been successfully operated since 1997, and several follow-on missions are in development or under discussion. The SVLBI missions are among the most complex space science missions to date in terms of operations and coordination of the disparate worldwid...
متن کاملAnalog Transmission for Space Very Long Baseline Interferometry
Studies of advanced space very long baseline interferometry (SVLBI) missions envision data rates as high as 8 Gb/s, but to accomplish such high-rate data transfer from the spacecraft to ground using digital downlinks requires high effective isotropic radiated power (EIRP), as well as complex and substantially advanced modulation and receiving techniques. For these reasons, analog signal transfe...
متن کاملVery Long Baseline Interferometry and the VLBAASP
Phase-referencing allows phase calibration of VLBI data. Using regular observations of a nearby calibrator source, delay, delay-rate, and phase corrections can be derived and their eeects removed from the target source visibility data. This technique allows imaging much weaker objects than is possible via fringe-tting methods. We examine the main types of phase error in VLBI observations (geome...
متن کاملVery Long Baseline Interferometry and the VLBAASP
The special problems encountered when performing spectral-line VLBI observations are discussed in this Chapter. In particular, the usefulness of Fourier transforming measured visibility data with respect to time, delay or frequency for purposes of fringe detection and calibration is clariied.
متن کاملGeodetic Very Long Baseline Interferometry (VLBI) :
A brief Note compiled by: Prof. Madhav N. Kulkarni, IIT Bombay Since the inception of the Very Long Baseline Interferometry (VLBI) system in 1967, this radio interferometry technique has revolutionised the fields of geodesy, geodynamics and astrometry. With the unprecedented precision and resolution made possible by VLBI various tasks such as geodetic positioning, reference frames interconnect...
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ژورنال
عنوان ژورنال: Nature
سال: 1984
ISSN: 0028-0836,1476-4687
DOI: 10.1038/312017a0