中国大陆GPS速度场的球面小波模型及多尺度特征分析  

The Spherical Wavelet Model and Multiscale Analysis of Characteristics of GPS Velocity Fields in China's Mainland

作　　者：程鹏飞[1] 文汉江[2] 孙罗庆 成英燕[2] 张鹏[4] 秘金钟[2] 王华[2] 

机构地区：[1]国家测绘产品质量检验测试中心,北京100830 [2]中国测绘科学研究院,北京100830 [3]深圳市勘察测绘院有限公司,广东深圳518028 [4]国家基础地理信息中心,北京100830

出　　处：《测绘学报》2015年第10期1063-1070,共8页Acta Geodaetica et Cartographica Sinica

基　　金：国家973计划(2013CB733302);国家自然科学基金(41274031;41374014;41404014);国家863计划(2013AA122501;2013AA122502)~~

摘　　要：利用1999—2009年间中国大陆共1068个GPS站点在东方向、北方向的速度值,采用DOG球面小波多尺度分析方法,建立了中国大陆东方向、北方向多尺度速度场。球面小波模型的尺度主要根据观测站点的密度来确定,利用检核点上的已知速度与模型速度之间的均方差来评定模型的精度。利用球面小波模型可以更加清晰地表示速度场的大尺度特征和复杂的局部变化特征。站点稠密区域,模型在东方向、北方向上的精度分别为±0.95mm/a、±0.97mm/a,稀疏区域对应的精度分别为±1.32mm/a和±1.30mm/a。The GPS measurements of the Crustal Movement Observation Network in China(CMONC)from1999to 2009 were processed,and the velocities of 1068 stations in east and north directions were derived.These velocities were used to establish velocity models in east and north directions within China's Mainland by using Difference of Gauss(DOG)spherical wavelet.The trend of GPS velocity fields are derived by regional Euler vector method,the residual velocity fields are then used for the spherical wavelet modeling.The scales of wavelets are selected according to distributions of GPS stations.The accuracy of the model is estimated according to the mean square deviation between observations and model,which is ±0.95mm/a for east direction,and±0.97mm/a for north direction in the region with dense stations,while it is±1.32mm/a and±1.30mm/a respectively for east and north directions in the region with sparse stations.The spherical wavelet modeling of the velocity can also show characteristics at different scales.

关 键 词：GPS速度场 DOG球面小波 多尺度估计 

分 类 号：P223[天文地球—大地测量学与测量工程]