山东CORS站噪声特征分析

Noise characteristic analysis of Shandong CORS

针对不同区域坐标时间序列的周期和噪声特性存在差异问题,以山东27个连续运行参考站(CORS站)2015年至2018年的数据为研究对象,在数据预处理的基础上,对各站点坐标分量的周期和噪声进行研究。结果表明:水平方向存在着明显的线性运动,垂直方向的周期运动较为规律;坐标分量的谱指数显示大部分站点的噪声模型为白噪声+闪烁噪声。为合理地确定噪声模型,采用最大似然估计法,确定了山东CORS坐标时间序列N方向的最佳噪声模型为白噪声+闪烁噪声,E、U方向的最佳噪声模型为白噪声+闪烁噪声+随机漫步噪声。

In view of the differences in the characteristics of cycle and noise in different regions,the coordinate time series of 27 Shandong continuously operating reference stations(CORS)from 2015 to 2018 were taken as the research object.Based on the data preprocessing,the period and noise of coordinate components of each station were studied.The results show that there is obvious linear motion in the horizontal direction and periodic motion in the vertical direction.Coordinate component spectrum index shows that the noise model of most sites is white noise and flicker noise.The maximum likelihood estimation method is used to reasonably determie the noise model.The estimation method determines that the best noise model in the N direction of the Shandong CORS station coordinate time series is white noise and flicker noise,and the best noise model in the E and U directions is white noise and flicker noise and random walk noise.