利用GRACE改正GPS测站垂直方向的周期变化  

Correction of Seasonal Variation of GPS Site Vertical Direction Using GRACE

作　　者：熊永合 张厚禄 XIONG Yonghe;ZHANG Houlu(Qinghai Institute of Remote Sensing Surveying and Mapping,Xining 810000,China)

机构地区：[1]青海省遥感测绘院

出　　处：《测绘地理信息》2019年第6期38-40,共3页Journal of Geomatics

基　　金：中国地震局地震科技星火计划(XH17062Y)

摘　　要：处理青藏高原南部GPS站点多年的观测资料,结合地球重力场恢复和气候实验(gravity recovery and climate experiment,GRACE)数据反演得到的该区域地表质量变化引起的垂直方向变化值,发现该地区GPS观测的垂直方向时间序列与GRACE反演的地表垂向位移存在较大的相关性,多数站点的相关性在80%以上,部分站点的相关性甚至达到了95%以上。进一步研究发现,GPS和GRACE两种空间大地测量技术获得的时间序列存在较为明显的周期性周期变化,并且振幅和相位较为一致,利用GRACE改正GPS垂向观测值并定量计算其有效性。The observations of the GPS stations in the southern part of the Qinghai-Tibet Plateau for more than a year, combined with the gravity field recovery and climate experiment(GRACE) data inversion, the vertical direction change caused by the change of surface quality in the region, the area was found. The vertical direction time series of GPS observation has a great correlation with the vertical displacement of GRACE inversion. The correlation of most stations is over 80%, and the correlation of some stations even reaches more than 95%. Further research has found that the time series obtained by GPS and GRACE geostation techniques has obvious seasonal periodic changes, and the amplitude and phase are consistent. GRACE is used to correct the GPS vertical observation and quantitatively calculate its validity.

关 键 词：青藏高原南部 GPS 重力场恢复和气候实验 周期变化 

分 类 号：P228[天文地球—大地测量学与测量工程] P223[天文地球—测绘科学与技术]