有色噪声对东南极区域GPS测站三维速度估计的影响
发布时间：2019-06-08 12:41
【摘要】：近年来,有研究发现在GPS测站坐标时间序列中既存在白噪声,也存在有色噪声。为了研究有色噪声对东南极区域GPS测站三维速度估计的影响,本文使用GAMIT/GLOBK10.5软件对东南极区域6个连续GPS测站2005—2014年的实测数据进行解算和平差,并利用最大似然法(MLE)分别估计了在两种假设噪声模型条件下的测站三维运动速度及其不确定性。结果表明:在进行参数估计时,考虑两种有色噪声(闪烁噪声和随机游走噪声)对东南极区域GPS测站三维速度估计的量级影响不大,水平方向最大影响量级为0.3 mm/a,垂直方向最大影响量级为0.8 mm/a;但如果不考虑有色噪声,会严重低估参数估计的真实不确定性。
[Abstract]:In recent years, it has been found that there is both white noise and colored noise in the coordinate time series of GPS station. In order to study the influence of colored noise on the three-dimensional velocity estimation of GPS stations in the East Antarctic region, this paper uses GAMIT/GLOBK10.5 software to solve the peace difference of the measured data of six continuous GPS stations in the East Antarctic region in 2005 and 2014. The maximum likelihood method (MLE) is used to estimate the three-dimensional velocity and its uncertainty of the station under two hypothetical noise models. The results show that two kinds of colored noise (flicker noise and random walk noise) have little effect on the three-dimensional velocity estimation of GPS station in East Antarctic region, and the maximum influence order of horizontal direction is 0.3 mm/a,. The maximum vertical influence order is 0.8 mm/a;. However, if colored noise is not considered, the real uncertainty of parameter estimation will be seriously underestimated.
【作者单位】： 山东电力工程咨询院有限公司;武汉大学中国南极测绘研究中心;
【基金】：国家自然科学基金重点项目(41531069)
【分类号】：P228.4
本文编号：2495288
[Abstract]:In recent years, it has been found that there is both white noise and colored noise in the coordinate time series of GPS station. In order to study the influence of colored noise on the three-dimensional velocity estimation of GPS stations in the East Antarctic region, this paper uses GAMIT/GLOBK10.5 software to solve the peace difference of the measured data of six continuous GPS stations in the East Antarctic region in 2005 and 2014. The maximum likelihood method (MLE) is used to estimate the three-dimensional velocity and its uncertainty of the station under two hypothetical noise models. The results show that two kinds of colored noise (flicker noise and random walk noise) have little effect on the three-dimensional velocity estimation of GPS station in East Antarctic region, and the maximum influence order of horizontal direction is 0.3 mm/a,. The maximum vertical influence order is 0.8 mm/a;. However, if colored noise is not considered, the real uncertainty of parameter estimation will be seriously underestimated.
【作者单位】： 山东电力工程咨询院有限公司;武汉大学中国南极测绘研究中心;
【基金】：国家自然科学基金重点项目(41531069)
【分类号】：P228.4
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