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Tropospheric correction in VLBI phase-referencing using GPS data

Published online by Cambridge University Press:  01 October 2007

B. Zhang ,
X. W. Zheng ,
J. L. Li ,
Y. Xu  and
J. F. Wu
B. Zhang
Affiliation:
Astronomy Department, Nanjing University, Nanjing 210093, P.R. China Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
X. W. Zheng
Affiliation:
Astronomy Department, Nanjing University, Nanjing 210093, P.R. China
J. L. Li
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
Y. Xu
Affiliation:
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, P.R. China
J. F. Wu
Affiliation:
Institute of Surveying and Mapping, PLA Information Engineering University, Zhengzhou 450002, P.R. China email: [email protected]
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Abstract

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Comparing the tropospheric zenith delays derived from VLBI and GPS data at VLBA stations collocated with GPS antenna, the systematic biases and standard deviations of the difference are both found to be at the level of a sub-centimeter. Based on this agreement, we used GPS data to correct the tropospheric effects in VLBI phase-referencing, resulting in close peak-to-noise ratios of images after tropospheric correction using GPS and VLBI data.

Keywords

atmospheric effectsastrometry
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. 212 - 213
Copyright
Copyright © International Astronomical Union 2008

References

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