【摘要】 根据GPS测量的速度计算地应变是地球动力学研究中非常有意义的一项工作,但计算时涉及数值微分,如何减小其计算误差是一个突出的问题。本文提出将工程测量中的平面应变花分析方法推广到地球球面上的广义应变花方法;并通过对已知位移和应变场的特例下的数值实验,比较常用的最小二乘配置法和广义应变花方法计算应变的精度。结果显示广义应变花法应变的计算精度比最小二乘配置法高。更多还原

【Abstract】 Computation of geo- strain by GPS data is significant in geodynamics.However,it involves digital differential and how to minimize the error is a prominent problem.In this paper,we propose the general global strain rosette method (GSRM) extended from flat surface strain rosette in engineering, and compare the accuracy of strains calculated by GSRM and LSCM (least square collocation method) from the known displacements and strains respectively.The result shows that GSRM has higher accuracy than LSCM in strain calculation.更多还原