基于有色噪声模型的GPS速度场精度与时间序列长度相关性研究

发布时间：2018-06-10 14:36

本文选题：GPS时间序列 + 噪声分析　；参考：《地震》2017年01期

【摘要】：利用2010—2015年陆态网络GPS连续观测站的三维站坐标时序资料,在采用最大似然估计MLE方法计算得到云南地区GPS基准站三维站坐标分量最优噪声模型的基础上,进一步定量对比分析了有色噪声和白噪声模型下陆态网络GPS连续站速度场稳定性与时间序列长度的关系。结果表明:在闪烁噪声模型下,中国大陆大部分地区GPS连续站1a时段的速度不确定度大。而随着时间的逐年累积,闪烁噪声模型下的速度不确定度与同时段白噪声模型下的差异逐步减小,闪烁噪声模型下3~4a时段的速度不确定度与同时段白噪声模型的差异小于0.2mm。研究说明在有色噪声模型下要获得高精度的速度场需要3~4a的观测数据,白噪声模型下GPS速度场精度可靠可信的前提是采用不少于3~4a的数据。
[Abstract]:Based on the coordinate sequence data of GPS continuous stations in the land network from 2010 to 2015, the optimal noise model of coordinate components of GPS reference stations in Yunnan is obtained by using MLE method of maximum likelihood estimation. Furthermore, the relationship between the stability of GPS continuous station velocity field and the length of time series in land-based networks under colored and white noise models is analyzed quantitatively. The results show that under the model of scintillation noise, the velocity uncertainty of GPS continuous stations in most areas of mainland China is large in 1a period. However, with the accumulation of time year by year, the difference between the velocity uncertainty of the scintillation noise model and the white noise model at the same time is gradually reduced, and the difference between the velocity uncertainty of the 3 ~ 4a period and the white noise model of the same time period is less than 0.2 mm. under the flicker noise model and the white noise model at the same time. It is shown that the accuracy of GPS velocity field under colored noise model needs 3 ~ 4a to obtain high accuracy velocity field, and the reliable premise of GPS velocity field accuracy under white noise model is to adopt data of not less than 3 ~ 4a.
【作者单位】：中国地震局第一监测中心;
【基金】：科技基础性工作专项重点项目(2015FY210400) 国家自然科学基金项目(41472180) 2015年度震情跟踪定向工作任务(2015020202)资助
【分类号】：P228.4;P315.7

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