摘要
航空电磁勘探中,高度计显示的发射线圈高度数据往往是不准确的,这可能会影响反演结果,出现假异常现象。针对这一情况,提出了一种高度计数据不准确条件下的航空瞬变电磁资料一维反演方法,在重构地电参数的同时也对发射线圈高度值进行校正。由于航空电磁反演问题是典型的病态问题,使用正则化反演方法,正则化因子由数据目标函数与模型目标函数之间的关系以自适应方式给出,使得反演迭代能稳定进行。以直升机航空瞬变电磁资料反演为例,用理论模型响应数据加入噪声进行反演,结果表明,无论初始高度值是高于真值还是低于真值,该反演方法均能够较好地重构地下介质参数和发射线圈高度值;作为反演初值的发射线圈高度测量值越准确时,反演迭代收敛速度就越快,反演效果也越好。
In the airborne electromagnetic survey,the altimeter data of transmitter coil are often inaccurate,which can affect the inversion result and give spurious anomalies.To overcome these shortcomings,this paper presents a 1D inversion method of airborne electromagnetic data in time-domain for inaccurate observed transmitter height.The inversion algorithm,using observed voltage data,can invert geo-electrical parameters and transmitter coil height simultaneously.The algorithm applies a regularized inversion algorithm to overcome the typical ill-condition inversion problem,and the regularized factors are calculated with an adaptive style based on the relationship between the data object function and the model object function so that the iterative inversion can be steadily carried out.The validity of the inversion method was tested using the helicopter airborne electromagnetic data as an example in this paper,which was performed by adoption of theoretical model response data with the addition of random noise.The inversion result shows that no mater whether the initial height value is higher or lower than the true value,the inversion algorithm can reconstruct subsurface medium parameter and transmitter coil height very well.The more accurate the transmitter coil height used as the inversion initial value is,the faster the convergence rate of inversion iteration and the better the inversion effect will be.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第3期402-405,共4页
Geophysical and Geochemical Exploration
基金
863计划项目(2006AA06A205)资助
关键词
航空电磁勘探
测高数据校正
自适应正则化反演
airborne electromagnetic exploration
altimeter data correction
adaptive regularized inversion
transmitter coil height
