航空时间域电磁法回线源有限差分初始场计算  

Calculation of initial filed for loop source in airborne time-domain electromagnetic by finite-difference approach

作　　者：许洋铖[1] 林君[1] 嵇艳鞠[1] 巩源峰[1] 关珊珊[1] 

机构地区：[1]吉林大学仪器科学与电气工程学院/地球信息探测仪器教育部重点实验室,吉林长春130025

出　　处：《电波科学学报》2010年第2期259-264,404,共7页Chinese Journal of Radio Science

基　　金：国家高科技发展计划项目资助(2006AA06A205)

摘　　要：针对时间域回线源航空电磁有限差分法初始场中双重贝塞尔函数的数值计算,通过分析回线积分法、宗量近似法和贝塞尔函数展开法的特点,提出将贝塞尔函数展开与小宗量近似相结合的混合法,并用共求解全部空间的初始电磁场,不仅计算速度快,而且精度高,满足有限差分对计算时间和计算精度的要求,为计算全空间复杂地质异常体电磁响应奠定了基础。For the calculation of initial electromagnetic field in airborne time domain electromagnetic finite difference method,which includes dual-Bessel functions because of the round loop source,through analyzing the characteristics of loop integration,asymptotic expression of Bessel Function and Bessel functions expansion method,this paper proposes a hybrid method which combines Bessel function expansion and little argument approximation,to find the solution of the initial electromagnetic field in full space.This hybrid method can meet the requirements of finite difference method in calculation time and precision,in addition,it lays the foundation of computing the electromagnetic response.

关 键 词：时间域有限差分 航空电磁法 初始场 回线源 混合法 

分 类 号：P631[天文地球—地质矿产勘探]