数学形态滤波在音频大地电磁去噪中的应用  

The Application of Mathematical Morphological Filtering to the Noise Suppression of Audio Magnetotelluric Sounding Data

作　　者：汤磊[1] 汤洪志[1] 韩雪平[1,2] 刘俊峰[1] 

机构地区：[1]东华理工大学核工程与地球物理学院,江西抚州344000 [2]江西省地质矿产勘查开发局赣西地质调查大队,江西南昌330201

出　　处：《工程地球物理学报》2013年第4期533-538,共6页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金项目(编号:41264004);东华理工大学研究生创新基金项目(编号:DYCA11008)资助

摘　　要：大地电磁去噪方法种类多,且各有其优缺点。本文引入汤井田教授的一种新方法——数学形态滤波法,它是依据形态学原理而创建的一种新型的非线性滤波方法,在信号和图像处理领域中得到广泛的运用。本文通过仿真实验设计一个加噪的正弦曲线,通过经腐蚀运算、膨胀运算、开闭运算、闭开运算和经形态滤波后分析曲线特征,之后对比经组合广义形态滤波在同一结构元素不同长度、同一长度不同结构元素滤波效果,最后将组合广义形态滤波引进到实测的音频大地电磁数据中,对比其滤波前和滤波后的视电阻率曲线,结果表明形态滤波能有效抑制音频大地电磁法中大尺度干扰,取得了良好的应用效果。There are many noise suppression methods of magnetotelluric sounding data,and each has its advantages and disadvantages.A new method is introduced in this paper from Professor Tangjing Tian—morphological filtering method,which is based on the principle of morphological to create a new type of nonlinear filtering method.The new method can be widely used in the fields of signal and image processing.In this paper,through the simulation experiment a sine curve of plus noise is designed and the curve characteristics are analyzed by the corrosion of operation,expansion of operations,opening and closing operation,closing and opening operation,and the morphological filtering.After comparing the effects of the combination generalized morphological filtering in the same structural elements of different lengths,the same length of different structural elements.Finally,the combination of generalized morphological filtering is introduced into the measured audio magnetotelluric data,compared to the apparent resistivity curve of the filter before and after filtering,The results showed that morphological filtering can effectively inhibit the audio magnetotelluric method of the large-scale disturbances,which has achieved a good application effect.

关 键 词：音频大地电磁 形态滤波 组合广义形态滤波 

分 类 号：P631.3[天文地球—地质矿产勘探]