Full waveform inversion with spectral conjugategradient method

查看全文 作　　者：LIU [1]Xiao;LIU [1]Mingchen;SUN [1]Hui;WANG [1]Qianlong 机构地区：[1]College of Geo-Exploration Science and Technology,Jilin University,Changchun 130026,China 出　　处：《Global Geology》索引2017年第20卷第1期,共6页 摘　　要：Spectral conjugate gradient method is an algorithm obtained by combination of spectral gradient method and conjugate gradient method,which is characterized with global convergence and simplicity of spectral gradient method,and small storage of conjugate gradient method.Besides,the spectral conjugate gradient method was proved that the search direction at each iteration is a descent direction of objective function even without relying on any line search method.Spectral conjugate gradient method is applied to full waveform inversion for numerical tests on Marmousi model.The authors give a comparison on numerical results obtained by steepest descent method,conjugate gradient method and spectral conjugate gradient method,which shows that the spectral conjugate gradient method is superior to the other two methods. 关 键 词：共轭梯度法 波形反演 MARMOUSI模型 全局收敛性 最速下降法 梯度方法 下降方向 目标函数