用球谐函数整体解算GPS应变场方法研究  

RESEARCH ON METHOD FOR ENTIRE CALCULATION OF GPS STRAIN FIELD BY USING SPHERICAL HARMONIC FUNCTION

作　　者：武艳强[1] 江在森[1] 杨国华[2] 魏文薪[1] 刘晓霞[1] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震局第一监测中心,天津300180

出　　处：《大地测量与地球动力学》2009年第6期68-73,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震预测研究所基本科研业务专项(02092401);国家自然科学基金(40674010)

摘　　要：探讨利用球谐函数方法整体解算大区域应变场的方法。用该方法对1999—2004年中国大陆区域网GPS速度场数据进行了分析,给出了该期间的中国大陆应变率场分布,并从残差分布规律角度讨论了球谐函数方法的有效性。针对该方法产生的边缘效应问题,提出了对研究区域外部进行插值后再进行应变计算的解决办法。The method for entire calculation of GPS strain field in large region by using spherical harmonic function is discussed. On the basis of comparing the theoretical results and calculation results, the strain calculating method is tested effectively. Then, the correlation coefficients between theoretical result and calculation result are calculated, and the results show that the strain calculation method is very robust that the correlation coefficient does not decreased significantly with the increasing of addition error. Subsequently, the GPS strain rate field of local network in China mainland using 1999 - 2004 GPS velocity fields is analyzed and the effectiveness of sphere harmonic method from the viewpoint of distribution law of residual error. In view of the edge effect of sphere harmonic method, it give a solving method which is interpolating outside the researched region before strain calculation. Lastly, the characteristics of spherical harmonic function method are discussed and some advices of strain calculation are given.

关 键 词：球谐函数 GPS应变场 模拟数据 抗差性 Kriging插值方法 

分 类 号：P227[天文地球—大地测量学与测量工程] P553[天文地球—测绘科学与技术]