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A strategy for implementing differential VLBI

Published online by Cambridge University Press:  01 October 2007

J. L. Li ,
J. Wang ,
S. B. Qiao  and
F. Tian
J. L. Li
Affiliation:
Shanghai Astronomical Observatory, Shanghai 200030, China
J. Wang
Affiliation:
Shanghai Astronomical Observatory, Shanghai 200030, China
S. B. Qiao
Affiliation:
Shanghai Astronomical Observatory, Shanghai 200030, China Surveying and Mapping Institute, Zhengzhou 450052, China email: [email protected]
F. Tian
Affiliation:
Shanghai Astronomical Observatory, Shanghai 200030, China
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Abstract

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Based on past astrometric and geodetic VLBI observations, a strategy for implementing differential VLBI (DVLBI) is developed by interpolating the non-geometric delay (NGD) at the target's direction using observations of several reference sources spreaded out within a circular ring centered on the target. In contrast to the ordinary approach, in our design the limitations in the angular distance are relaxed and the effects of observational uncertainties in reference sources are reduced. Analysis shows that in our design a precision of the NGD correction in S-band reaches about 1ns only. Our design can be adopted for observations of weak sources and in deep space exploration.

Keywords

atmospheric effectsmethods: data analysisreference systemsastrometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 210 - 211
Copyright
Copyright © International Astronomical Union 2008

References

Sovers, O. J., Fanselow, J. L., & Jacobs, C. S. 1998, Reviews of Modern Physics 70, 1393CrossRefGoogle Scholar