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测绘学报  2014 

环境负载对区域GPS基准站时间序列的影响分析

DOI: 10.13485/j.cnki.11-2089.2014.0149, PP. 1217-1223

Keywords: 中国地壳运动观测网络,武汉市连续运行卫星定位服务系统,环境负载,时间序列分析

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Abstract:

基于1999—2011年中国地壳运动观测网络(CMONOC)及2007—2012年武汉市连续运行卫星定位服务系统(WHCORS)的观测数据,联合中国及周边35个IGS基准站数据,采用GAMIT软件解算,获得了ITRF2008框架下的GPS基准站坐标时间序列.然后采用QOCA计算了环境负载位移,并利用其对GPS时间序列进行改正.研究结果表明环境负载造成的中国区域基准站位移呈现显著的区域性特征,东北、华北、华中区域变化较为一致且较大,西南区域基准站(KUNM)垂直方向的负载位移均方根(RMS)最大值达6.09mm.通过对改正前后的数据进行时间序列分析,认为环境负载改正能够削弱中国区域大多数GPS基准站(约70%)垂直及水平东方向位移时间序列的非线性变化,其加权均方根(WRMS)减小量最大达1.5mm,但是对于水平北方向坐标时间序列的改善作用不明显.

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