摘要
Abstract
The newly released international terrestrial reference frame 2020(ITRF2020)utilizes longer time-series data,more advanced models,and more reasonable processing strategies.It also introduces seasonal signals at the station level,which improves the precision of ITRF2020 compared to the international terrestrial reference frame 2014(ITRF2014).As a result,upgrading the framework for regional reference station networks is essential.This paper took 35 enhanced stations from Qiandun Positioning Network Co.,Ltd.as an example to compare the differences in constraints between the linear ITRF2020 and nonlinear ITRF2020,analyzed the impact of seasonal signals on regional reference stations in China,and assessed the coordinate differences of Chinese regional reference stations under ITRF2014 and ITRF2020.The results show that the constraint accuracy of the nonlinear ITRF2020 is comparable to that of the linear ITRF2020.Seasonal signals have an impact of approximately 1 mm on the vertical(Up)direction of the Chinese regional reference station network,with distinct spatiotemporal characteristics.Upgrading the Chinese reference station network from ITRF2014 to ITRF2020 will cause millimeter-level differences in the east(East)and north(North)coordinates,and nearly centimeter-level differences in the vertical(Up)coordinates.Therefore,upgrading the framework of the Chinese regional reference station network from ITRF2014 to ITRF2020,as well as whether to apply the seasonal signal correction from ITRF2020,has a minor impact on engineering applications,but requires careful consideration for higher-demand scientific research.关键词
国际地球参考框架2020(ITRF2020)/国际地球参考框架2014(ITRF2014)/季节性信号/区域基准站网/全球导航卫星系统(GNSS)Key words
international terrestrial reference frame 2020(ITRF2020)/international terrestrial reference frame 2014(ITRF2014)/seasonal signal/regional reference station network/global navigation satellite system(GNSS)分类
测绘与仪器
