顾及有色噪声影响的甘肃境内CMONOC基准站坐标时间序列分析

Coordinate time series analysis of CMONOC stations in Gansu Province considering the influence of colored noise

针对甘肃省境内19个CMONOC基准站坐标时间序列结果,采用极大似然估计法(MLE)探讨了各基准站的最优噪声模型,确定了基准站的速度场,并分析了甘肃省地壳运动状况.研究结果表明:甘肃省境内CMONOC基准站各坐标分量噪声特性存在较大的差异,“白噪声+闪烁噪声(WN+FN)”为最优噪声模型,能够更好地描述基准站坐标时间序列3分量上的噪声特性,且估算的速率不确定度是仅考虑WN时的4~15倍.甘肃省CMONOC基准站在ITRF14框架下水平方向运动的平均速率为34.54 mm/a,运动方向为SEE 98.07°;相对于欧亚板块的水平方向运动的平均速率为6.49 mm/a,运动方向为NEE 79.23°.

According to the coordinate time series results of 19 CMONOC reference stations in Gansu Province,the maximum likelihood estimate(MLE)was used to explore the optimal noise model of each reference station,the velocity field of the reference station was determined,and the crustal movement in Gansu Province was analyzed.The research results show that the noise characteristics of each coordinate component of the CMONOC reference station in Gansu Province are quite different."WN+FN"is the optimal noise model,which can better describe the noise characteristics of the three components of the reference station coordinate time series,and The estimated rate uncertainty is 4 to 15 times when only white noise is considered.The average rate of horizontal movement of the CMONOC reference station in Gansu Province under the framework of ITRF14 is 34.54 mm/a and the direction of movement is SEE 98.07°;the average rate of horizontal movement relative to the Eurasian plate is 6.49 mm/a and the direction of movement is NEE 79.23°.