选取ITRF2005框架下中国区域（包括台湾地区）11个IGS基准站1995—2010年的坐标时间序列，采用不同噪声模型组合对它们进行噪声分析，并计算大气压负载、非潮汐海洋负载、积雪深度及土壤湿度负载对测站位移的影响，得到地表质量负载改正前后各测站分量的最优噪声模型。结果表明，中国区域IGS基准站的噪声模型存在多样性，且各分量具有不同的噪声特性，主要表现为闪烁噪声＋白噪声和带通幂律噪声＋白噪声。噪声模型与地表质量负载及其测站速度、速度不确定度之间的定量分析表明地表质量负载会造成测站的噪声特性变化，主要表现为带通及随机漫步噪声特征。不r6复杂噪声模型对测站线性速度及不确定度会产生一定影响，少数测站高程分量差异甚至超过1mm／a。%Focusing on the coordinate time series of 11 IGS reference stations in China mainland and Taiwan region during period of 1995 to 2010 under ITRF2005, noise analysis has been implemented using different noise model combination. Meanwhile, impacts of different surface mass loadingson station displacement have been calculated, such as atmospheric pressure loading, nontidal ocean loading, snow depth and soil moisture loading. From these analyses, optimal noise models of different station components before and after surface mass loading correction have been obtained. Conclusion is drawn that noise model of IGSstation coordinate time series in China represent diversity characteristics with different noise feature among different components, mainly behaving as flicker noise plus white noise model aswell as band pass plus power law plus white noise model. Other complicated noise models also account for a certain proportion, which is different from the existing results. Furthermore, relationship has been analyzed quantitatively among noise model, surface mass loading together with station＇s linear velocity and its uncertainty respectively. It is found that different complicated noise models would influence station＇s linear velocity and its uncertainty with maximum discrepancy larger than 1 mm/a. Besides, the calculated four kinds of surface mass loading could introduce noise changes mainly representing as band pass and random walk characteristics.
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