华北区域GNSS基准站高程时间序列的非线性变化分析

Non-linear variation analysis of height time series ofnorth China GNSS reference stations

基于陆态网络全球卫星导航系统(GNSS)观测成果,采用功率谱分析法和最小二乘方法,以华北地区为例,研究了区域基准站高程时间序列的非线性变化特征,并分析了不同环境负载的影响.结果表明,GNSS基准站高程方向存在显著的周年和半年周期特征,且周年特征要显著于半周年特征.位于不同地区的基准站的振幅和相位存在差异,华北平原南部地区的周年振幅要大于北部地区,整体上华北地区周年变化在秋季时节振幅达到最大.不同环境负载效应对华北GNSS高程位移的影响不一致,利用三种环境负载修正GNSS序列后,水文负载的修正效果最好,非潮汐大气负载次之,非潮汐海洋负载修正结果不理想.

The non-linear variation analysis of height time series of GNSS reference Stations in North China is studied by using power spectral analysis and least-squares method based on the GNSS observations of the CMONOC network,and the effects of different environmental loads are also analyzed.The results show that there are obvious annual and semi-annual cycle features in the height time series of the GNSS reference station in North China,and the annual feature is more significant than the semi-annual feature.There are differences in the periodic amplitudes and phases of the reference stations located in different regions,and the annual amplitudes are larger in the southern part of the North China than in the northern part.The overall annual variation in North China reached its maximum in the autumn season.The effect of different environmental loading effects on the GNSS height displacement of the North China is inconsistent.Results of correcting the GNSS time series using three environmental loads,So that,the hydrological loads have the best corrections,followed by the non-tidal atmospheric loads,and non-tidal ocean loads have poor corrections.