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中文摘要：
针对附加约束条件的地基GPS层析水汽算法中存在的异类观测值定权问题，以及低高度角GPS信号受底层大气折射影响误差偏大等问题，对顾及抗差方差分量的地基GPS层析水汽算法进行了定量的研究分析。实验结果证实，该算法用于地基GPS层析水汽中调整异类观测值权重和抵制粗差具有有效性和可靠性。
英文摘要：
With the rapid development of GNSS, especially for COMPASS and regional CORS station, how to use these abundant GNSS signals to tomography spatial water vapor becomes one of research focuses. It is necessary to use additional constrained condition for tomography spatial water vapor. In order to get reasonable weight for different observations and reduce atmosphere effect for lower elevation GPS signals, the tomography algorithm with robust variance components estimation（R-VCE） is detailed researched and analyzed in this paper. The results indicate that the algorithm with R-VCE is reliable for Ground-based GPS tomography water vapor.
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