中文摘要：

青岛大港验潮站的地壳沉降关系到该站平均海平面的绝对变化,因而也就关系到我国高程基准面的变化。本文利用青岛GNSS基准站约10年的观测数据对该站的地壳沉降变化进行分析。首先将青岛GNSS基准站纳入由50个国际IGS站和43个国内陆态网络基准站组成的全球网中,进行单日松弛解和单日约束解解算,获得该站坐标时间序列。然后对该站垂向坐标时间序列进行分析,利用粗差探测、偏差探测、趋势项分析、频谱分析等方法对粗差、偏差、趋势项和周期项进行探测、分析,并通过时间序列模型估计获得时间序列中的周期项振幅和偏差估值。分析表明青岛GNSS基准站垂直方向近一段时间未发现存在显著性的地壳沉降变化,但受到比较明显的周年和半周年周期变化影响。结合青岛大港验潮站验潮数据分析结果得出结论：青岛大港验潮站平均海平面的绝对上升速率是1.62mm/a。

英文摘要：

Crustal subsidence at Dagang tidal station affects the Huanghai mean sea level which defines the national height datum.The crustal subsidence at Dagang tidal station located 1.5km away from Qingdao GNSS fiducial station is analyzed,by using approximately 10 years of GNSS observations.Firstly,the daily relax solutions and daily constrained solutions for coordinates of this station are computed in a combined adjustment involving aglobal GNSS net of 50 IGS stations and a regional net of 43 CMONOC stations.Then,a time series spanning 10 years for station coordinates aligned to ITRF2014 is obtained.And next,the time series of height components is analyzed to detect outliers,offsets,trends and frequencies and the amplitudes of periodic parts and the values of offsets are obtained.It is shown that no trend is found in the series.But it is found that the annual and semi-annual signals influence the changes of the series obviously.Finally,it is concluded in combination with the analysis of tidal data for Dagang tidal station that the mean sea level at Dagang tidal station is ascending with a speed of 1.62mm/a.