以云南地区27个GPS基准站坐标时间序列为研究对象，使用赤池信息量和贝叶斯信息量估计准则（AIC/BIC）对其进行噪声分析，计算并扣除时间序列中大气负载、非潮汐海洋负载和水文负载3种环境负载引起的位移量，得到各基准站分量在环境负载改正前后的最优噪声模型。结果表明，部分基准站分量经过负载改正后最优噪声模型会发生变化，改正前后的大部分基准站噪声特性均体现为闪烁+白噪声和幂律噪声。环境负载对基准站的垂向位移影响比水平向更为显著，水文负载成为影响基准站的最大因素，最大位移量达到厘米级。分析环境负载改正前后噪声特性的变化表明，环境负载改正在U分量上的影响最大，N分量次之，E分量最小，噪声模型的变化在地域上并未呈现明显规律。

The coordinate time series of 27 base stations in the terrestrial network of Yunnan region from 2011 to 2017 were selected,and noise analysis was performed by using a combination of multiple noise models,in which the hydrological load(HYDL)three environmental load,modify the base station time series after solution,compare the optimal noise model of each station component before and after the environmental load correction. The results show that the noise characteristics of the components of the base stations in Yunnan area are different,which are mainly reflected by white noise + flicker noise and power law noise. The effect of environmental load on the vertical displacement of the reference station is more significant than horizontal. The hydrological load has become the largest factor affecting the reference station,and the maximum displacement amount reaches cm level. Analysis of the changes in the noise characteristics before and after the environmental load correction shows that the environmental load correction has the greatest impact on the U component,followed by the N component,and the E component is the smallest. The change of the noise model does not show a clear pattern in the areas.

P315

国家自然科学基金（41672192）资助