武汉IGS站WUHN点位变化特征分析

WUHN Point Change Characteristic Analysis of Wuhan IGS Station

针对不同地区IGS观测站时间序列周期性、运动特征存在差异的问题,基于GAMIT/GLOBK 10.7软件获取了2010—2020年武汉(WUHN)站的ITRF 2014坐标时间序列;并利用功率谱分析方法对WUHN站时间序列周期项进行分离和提取。实验结果表明,WUHN站坐标时间序列在U方向上存在年周期性和半年周期性;在N、E方向上具有线性变化特征,平均运动速度分别为-12 mm/a和33 mm/a;武汉地区呈向东南方向运动的趋势,通过极大似然值分析,证实了WUHN站坐标时间序列噪声最佳模型为白噪声+随机游走噪声+闪烁噪声组合模型。

In view of the periodicity of time series and the difference of moving characteristics of IGS observation stations in different regions,we obtained the coordinate time series of Wuhan(WUHN)station in ITRF 2014 from 2010 to 2020 based on GAMIT/GLOBK 10.7 software.Then,we used the power spectrum analysis method to separate and extract the periodic term of time series of WUHN station.The experimental results show that the coordinate time series of WUHN station has annual periodicity and semiannual periodicity in the U direction,and the N and E directions have the characteristic of linear change.The average moving speeds in the N and E directions are-12 mm/a and 33 mm/a respective-ly.Wuhan region shows a trend of moving to the southeast.Through the analysis of maximum likelihood value,it is confirmed that the best mod-el of coordinate time series noise of WUHN station is white noise+rand walk noise+flicker noise combined model.