中国大陆水平运动速度场的多面函数模型

Hardy Multi-quadric Fitting Model of Chinese Mainland Horizontal Crustal Movement

根据1998～2009年的GPS基准站和重复观测资料,获得了1 041个点在2000中国大地坐标系下的速度,研究了利用多面函数建立速度场模型的关键问题:核函数的选择、平滑因子的确定以及结点的确定,并利用多面函数建立了覆盖中国大陆范围的分布均匀、有实用价值的中国地壳水平运动整体速度场。

By processing GPS data of the fiducial stations and repeatedly observed stations from 1998 to 2009, the corresponding velocities of a set of 1 041 reference frame stations （RS） are obtained, constrained to the current frame of 2000 Chinese Geodetic Coordinate System （CGCS2000）. To establish the velocity field of horizontal crustal movement of Chi- nese mainland by using hardy multi-quadric fitting model and the velocities of 1 041 RS, we discuss the key problems of the hardy function interpolation： the influences of kernel func- tion, nodes and smoothing factor. And we establish a largely covered and valuable speed field model of horizontal crustal movement of Chinese mainland using hardy function interpo- lation. This established speed field result would be widely used for maintaining 2000 Chinese Terrestrial Reference Frame （CTRF2000） and researching the crustal movement of Chinese mainland.