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Application of very long baseline interferometry to Astrometry and Geodesy: effects of frequency standard instability on accuracyThe accuracy of geodetic and astrometric information obtained from very long baseline interferometry (VLBI) observations is dependent upon the stability of the frequency standard, or clock, used at each site of VLBI array. The sensitivities of two hydrogen maser frequency standards of different design to pressure, temperature, and magnetic field variations were measured; and, for one of the standards, sensitivity was found to be severe enough to degrade the information content of VLBI measurements. However, the effect on the geometric and astrometric information of such clock instabilities, with time scales of hours or greater, can be sharply reduced through the use of differencing techniques.
Document ID
19750019122
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Clark, T. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Whitney, A. R. (Northeast Radio Observatory Corp. Cambridge, United States)
Rogers, A. E. E. (Northeast Radio Observatory Corp.)
Hinteregger, H. F. (Northeast Radio Observatory Corp.)
Hanson, L. B. (Northeast Radio Observatory Corp.)
Counselman, C. C., III (Mass. Inst. of Tech.)
Shapiro, I. I. (Mass. Inst. of Tech.)
Date Acquired
August 8, 2013
Publication Date
January 1, 1974
Publication Information
Publication: Its Proc. of the Sixth Ann. Precise Time and Time Interval (PTTI) Planning Meeting
Subject Category
Earth Resources And Remote Sensing
Accession Number
75N27194
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19750019101Collected WorksProceedings of the Sixth Annual Precise Time and Time Interval (PTTI) Planning Meeting
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