基于快速余弦变换的低频电磁场数值滤波法正演  

Forward Numerical Filtering of Low Frequency Electromagnetic Field Response Based on Fast Cosine Transform Filtering Algorithm

作　　者：徐振平[1,2] 胡文宝[2] 

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074 [2]油气资源与勘查技术教育部重点实验室(长江大学),湖北荆州434023

出　　处：《石油天然气学报》2011年第1期63-67,166,共5页Journal of Oil and Gas Technology

基　　金：国家"973"规划项目(2007CB209607);国家自然科学基金项目(40727001;44704073)

摘　　要：利用快速汉克尔变换理论的推导方法,对快速余弦变换的滤波系数及算法进行了推导,得出了快速余弦变换的滤波系数。使用该系数计算含余弦的高振荡积分,降低了运算的时间,提高了计算的精度;并在柱状分层的地层电磁场响应的正演分析中进行了应用,分析了快速余弦变换滤波算法在低频电磁响应的误差。The theoretical derivation method of fast Hankel transform was used to derive the filter coefficients and algorithm of fast cosine transform,and the fast cosine transform filter coefficients were obtained,and the cosine filter coefficients were used to calculate the high-oscillation integrals and to reduce the computation time,improve the accuracy of the calculation,It is applied for forward numerical calculation of low frequency electromagnetic field response of cylindrical coordinate and for analyzing the errors of the cosine filtering algorithm of low frequency electromagnetic field response and the high precision frequency response is obtained.

关 键 词：快速余弦变换 快速汉克尔变换 滤波系数 柱状分层电磁响应 

分 类 号：P631.325[天文地球—地质矿产勘探]