摘要
针对地磁观测信号容易受仪器噪声和脉冲噪声等干扰,提出一种根据干扰特征对地磁信号进行数学形态滤波的新方法 .通过谐波拟合地磁日变形态信号中添加随机噪声和瞬态脉冲噪声,模拟抑制含有这类干扰的地磁信号.通过数值模拟,验证了数学形态滤波具有抑制脉冲干扰地磁信号噪声,降低仪器噪声干扰,保留地磁信号特征,提高地磁信号信噪比等良好的特性.最后通过对实际受干扰地磁信号的处理,取得较好效果.
In order to deal with instrument noise and impulse noise encountered in geomagnetic observations,a new data processing method based on the mathematical morphology filter is proposed to process geomagnetic signals with such noise. In this study, we use this method to process the stimulated geomagnetic diurnal variation signals combined with random noise and transient impulse noise. The numerical stimulation results indicate that the mathematical morphology filter is effective to eliminate the random noise and impulse noise, and improve the signalnoise ratio of geomagnetic signals. It is proved this new method has a good characteristic in processing the real geomagnetic signals with instrument noise and impulse noise caused by a passing vehicle.
出处
《地球物理学进展》
CSCD
北大核心
2011年第1期147-156,共10页
Progress in Geophysics
基金
公益性行业(地震)科研专项(20070817)资助
关键词
地磁数据干扰抑制
脉冲噪声
仪器噪声
数学形态滤波
geomagnetic data de-noising, impulse noise, instrumental noise, mathematical morphology filter
