期刊文献+

层矩阵法高精度快速数字滤波算法研究 被引量:1

Research on high accuracy and fast Digital Linear Filter(DLF)method of layer matrix method
原文传递
导出
摘要 可控源音频大地电磁法具有工作效率高、信号强度大、分辨能力好等优点,是电法勘探中的一个重要分支,高精度快速正演计算是其能够成功应用的重要基础.层矩阵方法可以模拟层状介质的电磁场响应,适用于可控源电磁法的正演计算,其最终计算结果取决于二维傅里叶反变换的计算精度.为了将层矩阵法应用于可控源音频大地电磁法的正演计算之中,本文尝试采用数字滤波方法进行二维波数域至空间域的数值计算.在大量试算分析的基础上,确定了滤波器的设计系数,计算得到了满足计算精度与速度要求的余弦变换滤波系数.将设计得到的滤波系数应用至二维傅里叶变换之中,通过典型模型计算结果对比,分析了二维数值滤波计算的精度.研究结果表明,本文设计的余弦变换滤波器能够同时满足计算速度与精度的要求,适合进行CSAMT模型的层矩阵法二维傅里叶积分计算.本文给出的方法及系数可为相关领域的专用数字滤波器的设计提供参考. Controlled Source Audio-frequency Magnetotelluric(CSAMT)has become an important branch of Electromagnetic(EM)method for its high efficiency,high signal strength,and good resolution.High-precision and fast forward calculation is an important basis for the successful application of this method.The layer matrix method can theoretically simulate the electromagnetic field at any position of the layered medium,which is suitable for the forward simulation of the controllable source electromagnetic method.However,the final calculation effect depends on the accuracy of two-dimensional inverse Fourier transforms.In order to apply the layer matrix method to the forward modeling of CSAMT,this paper uses the DLF method to carry out the numerical calculation from the two-dimensional wavenumber domain to the spatial domain.On the basis of a large number of trials and analyses,a suitable set of filter coefficients is eventually designed.Several typical models are established for the calculation of electromagnetic field using the layer matrix method with newly-built filter coefficients,Dipole1 D and analytical solution,and then the calculation accuracy was analyzed among them.The results show that the cosine transform filter designed in this paper is high-accuracy and suitable for the calculation of two-dimensional Fourier integral in the layer matrix method.The methods and coefficients given in this article can also provide insights for the design of special digital filters in related fields.
作者 谭洁玉 付长民 TAN JieYu;FU ChangMin(CAS Engineering Laboratory for Deep Resources Equipment and Technology,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,CAS,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处 《地球物理学进展》 CSCD 北大核心 2021年第6期2573-2580,共8页 Progress in Geophysics
基金 中国科学院战略性先导科技专项(A类)课题“井场数据平台与远程决策系统研制”(XDA14050300)资助。
关键词 可控源音频大地电磁法 层矩阵方法 数字线性滤波器 傅里叶变换 Controlled Source Audio-frequency Magnetotelluric(CSAMT) Layer matrix method Digital linear filter method Fourier transforms
  • 引文网络
  • 相关文献

参考文献3

二级参考文献20

共引文献91

同被引文献12

引证文献1

;
使用帮助 返回顶部