中国大陆IGS基准站基线时间序列噪声分析  

Baseline time series noise analysis of IGS reference stations in Chinese mainland

作　　者：吉长东[1] 沈祎凡 王强[1] JI Changdong;SHEN Yifan;WANG Qiang(Liaoning Techical University,Fuxin,Liaoning 123000,China)

机构地区：[1]辽宁工程技术大学

出　　处：《导航定位学报》2019年第3期108-114,共7页Journal of Navigation and Positioning

摘　　要：针对基线时间序列中信号与噪声难分离的问题,提出一种确定最优噪声模型的方法:利用幂律模型(PLM)与极大似然估计(MLE)相结合的方法,求出3维坐标向量的功率谱指数和最大似然估计值,确定出最优噪声模型;然后利用中国大陆6个IGS站6 a的观测数据进行实验。结果表明:基线时间序列存在白噪声(WN)、闪烁噪声(FN)和随机漫步噪声(RWN);N方向的情况为,当基线长度在1 015~2 500 km之间时,主要为WN+FN,当基线长度大于2 500 km且小于3 225 km时,则为WN+FN+RWN,且RWN占43.09%;E和U方向最优噪声模型分别为WN+RWN与WN+FN,并且RWN与FN分别占62.11%和89.88%。Aiming at the problem that it is difficult to separate the signal from the noise in baseline time series,the paper proposed a method of determining the optimal noise model:power law model(PLM)was combined with maximum likelihood estimate(MLE)to derive the power spectral index of three-dimensional coordinate vectors and the maximum likelihood estimation,and the optimal noise model was given;then the observation data of 6 years from 6 IGS stations in Chinese mainland was taken as the example to verify the feasibility of the method.Experimental result showed that there would exist white noise(WN),flicker noise(FN)and random walk noise(RWN)in the baseline time series;in the N direction,when the baseline length is between 1 015~2 500 km,it would be shown as WN+FN,and when the length is longer than 2 500 km and shorter than 3 225 km,it would be shown as WN+FN+RWN,with RWN accounting for 43.09%;in the E and U directions,the optimal noise models would be WN+RWN and WN+FN respectively,with RWN accounting for 62.11%and FN for 89.88%.

关 键 词：全球卫星导航系统(GNSS) 国际GNSS服务组织(IGS)基准站 基线时间序列 谱指数 极大似然估计 噪声模型 

分 类 号：P228[天文地球—大地测量学与测量工程]