我国高纬高寒地区省级CORS站时间序列分析

Time series analysis of provincial CORS stations in high latitude and severely cold region in China

针对目前在分析高纬高寒地区连续运行基准站(CORS)坐标时间序列变化趋势不充分的现状,该文采用GAMIT/GLOBK软件,联合周边10个IGS站,处理了17座黑龙江省CORS(HLJCORS)基准站2017—2019共3a的观测数据,获取了各基准站在ITRF2014框架下的坐标时间序列;对坐标序列进行小波多分辨率分析,发现各土层基准站周年项振幅会随着温度的降低而变大,振幅波动与温度变化有较好的一致性,阐明了高寒地区特有的冻胀物理现象对基准站周年项运动的影响;采用最小二乘线性拟合得到各基准站运动速度,并通过固定1个参考站得到各基准站间最大相对站速度,基于此给出了HLJCORS基准站框架坐标更新周期的建议。该研究拓展了基于CORS站时间序列分析的应用研究领域,可为省级参考框架的维护提供参考。

According to the current situation that the analysis of the change trend of the coordinate time series of continuously operating reference stations(CORS)in high latitude and cold region was insufficient,GAMIT/GLOBK software was used to process the observation data of 17CORS(HLJCORS)in Heilongjiang Province for 3 years from 2017to 2019,the coordinate time series of each station under the framework of ITRF2014were obtained;Based on wavelet multiresolution analysis of coordinate series,it was founded that the annual amplitude of each soil reference station increased with the decrease of temperature,and the fluctuation of amplitude was in good agreement with the change of temperature,the influence of frost heaving on the annual motion of reference station in high cold region was clarified;The velocities of each reference stations were obtained by least square linear fitting,by fixing one reference station,the maximum relative station velocity between each reference station was obtained,based on this,the suggestion of the frame coordinate update cycle of the HLJCORS reference station was given.The research results could expand the application research field of time series analysis based on CORS stations and provided reference for the maintenance of the provincial reference frame.