Abstract: GNSS positioning technology is an important means to carry out automatic dam deformation monitoring. GNSS multi-base station has obvious advantages over single-base station. Combined with the influencing factors of baseline processing and adjustment treatment, a data fusion technique for multi- base station based on baseline length and base station stability weight is proposed. The tests on Guandi hydropower dam show that it is easy to check the stability of the datum point and multi-base station provides more reliable reference data. The data fusion technique for GNSS multi-base station is adopted to fuse the processing results from the multi-base station of the same monitoring station and more accurate results are gotten to improve the reliability and accuracy of dam deformation monitoring.

Key words: dam, deformation monitoring, GNSS, multi-base station, data fusion

摘要： GNSS定位技术是开展大坝外部变形自动化监测的一项重要手段，GNSS多基站较单一基站具有明显的优势。笔者根据基线解算和平差处理影响因素，提出了基于基线长度和基站稳定性定权策略的多基站数据融合技术。官地水电站大坝GNSS多基站自动化变形监测系统试验研究表明，多基站便于检核基准点的稳定性，能够提供可靠的基准。采用基于基线长度和基站稳定性定权策略的多基站数据融合方法，对同一监测站的多基站解算成果进行融合，综合利用多基站数据能够得到更符合实际的变形信息，提升大坝变形监测的可靠性和精确度。

关键词: 大坝, 变形监测, GNSS, 多基站, 数据融合