中国大陆导航连续站周期信号空间规律研究

Study on spatial distribution of GNSS seasonal signals for continuous GNSS stations in China

为了进一步分析我国GNSS周期信号的空间分布规律,文章基于我国大陆及周边IGS站与中国地壳运动观测网络基准站的坐标时间序列,给出定量标准剔除质量差的测站;采用分段线性拟合法提取并扣除时间序列的趋势项;采用"拉依达准则"剔除时间序列中的奇异值;采用4参数三角函数拟合出时间序列的周期与幅度;分析东向、北向、垂向3个方向的年周期、半年周期的振幅与最大值出现月份在我国的空间分布情况。分析结果表明:3方向年周期的振幅都是半年周期振幅的两倍以上,3个方向不同周期振幅的空间分布规律差异明显。

In order to further study on the spatial distribution of GNSS seasonal signals of China,coordinate time series of IGS and continuous stations of the China Crust Movement Measuring Network Project were collected;quantitative criteria was given to exclude poor quality data;trends of time series were extracted by piecewise linear fitting;singular values were excluded by the Pauta criterion;then phase and amplitude were calculated through trigonometric fitting of 4parameters;finally,the spatial distribution of phase and amplitude of the annual and half annual signals of three directions（east,north and vertical）were analyzed.The study result showed that the amplitude of annual signal would be more than twice of that of the half-annual signal in the three directions,and the spatial distribution of the amplitude of different periods would have significant differences in three directions.