有色噪聲對東南極區(qū)域GPS測站三維速度估計的影響
發(fā)布時間：2019-06-08 12:41
【摘要】：近年來,有研究發(fā)現(xiàn)在GPS測站坐標時間序列中既存在白噪聲,也存在有色噪聲。為了研究有色噪聲對東南極區(qū)域GPS測站三維速度估計的影響,本文使用GAMIT/GLOBK10.5軟件對東南極區(qū)域6個連續(xù)GPS測站2005—2014年的實測數(shù)據(jù)進行解算和平差,并利用最大似然法(MLE)分別估計了在兩種假設(shè)噪聲模型條件下的測站三維運動速度及其不確定性。結(jié)果表明:在進行參數(shù)估計時,考慮兩種有色噪聲(閃爍噪聲和隨機游走噪聲)對東南極區(qū)域GPS測站三維速度估計的量級影響不大,水平方向最大影響量級為0.3 mm/a,垂直方向最大影響量級為0.8 mm/a;但如果不考慮有色噪聲,會嚴重低估參數(shù)估計的真實不確定性。
[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.
【作者單位】： 山東電力工程咨詢院有限公司;武漢大學(xué)中國南極測繪研究中心;
【基金】：國家自然科學(xué)基金重點項目(41531069)
【分類號】：P228.4
本文編號：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.
【作者單位】： 山東電力工程咨詢院有限公司;武漢大學(xué)中國南極測繪研究中心;
【基金】：國家自然科學(xué)基金重點項目(41531069)
【分類號】：P228.4
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