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Proceedings Paper

Tropospheric zenith delay monitoring in GPS precise point positioning
Author(s): Qing-lin Zhu; Zhen-sen Wu; Zhen-wei Zhao
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Paper Abstract

Precise point positioning (PPP) has been demonstrated to be a powerful sensor to monitor tropospheric zenith delay (TZD). In the PPP, some unmodelled biases still remain in the GPS observables and will inevitably degrade the precision of tropospheric zenith delay estimation. The researches show that the precision of PPP-derived TZD can be obviously improved through a suitable stochastic model for GPS measurements. Previous stochastic models assume that the accuracy of high-elevation GPS measurements is higher than that of low-elevation GPS measurements. A new stochastic model based on satellite elevation angel cosine is used in the presented paper. It examines the quality of the PPP-derived TZD calculated at shanghai GPS stations through comparison with those of nearby radiosonde soundings. It is found that the PPP-derived TZD have good agreement with results of radiosonde soundings. It is feasible to monitor tropospheric zenith delay by the singular GPS station in PPP.

Paper Details

Date Published: 2 April 2010
PDF: 4 pages
Proc. SPIE 7651, International Conference on Space Information Technology 2009, 76510E (2 April 2010); doi: 10.1117/12.855256
Show Author Affiliations
Qing-lin Zhu, Xidian Univ. (China)
Zhen-sen Wu, Xidian Univ. (China)
Zhen-wei Zhao, China Research Institute of Radio Wave Propagation (China)

Published in SPIE Proceedings Vol. 7651:
International Conference on Space Information Technology 2009
Xingrui Ma; Baohua Yang; Ming Li, Editor(s)

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