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Long-baseline radio interferometry with independent frequency standards

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1 Author(s)
Klemperer, W.K. ; National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Boulder, Colo.

The present stage of development of long-baseline interferometry using independent atomic frequency standards is reviewed. The technique is being applied to precision geodesy and astrometry and shows great promise as a means for the intercomparison of national time scales at the 1-ns error level. This paper discusses the development of radio interferometry and, in particular, the theory and practice of interferometry over a very wide (effective) bandwidth. The superb phase stability of the hydrogen maser frequency standard in the range of 100 s to several hours makes it the ideal local oscillator for long-baseline Interferometry.

Published in:

Proceedings of the IEEE  (Volume:60 ,  Issue: 5 )