摘要
航空瞬变电磁法是一种快速普查良导电金属矿的航空物探方法,由于其具有速度快、成本低、探测范围大等优点,已经在国内外获得了较为广泛的应用。由于二次场与源无关且反映地下介质的特性,所以主要针对二次场进行处理和解释。但二次场的有效能量较弱,因此常常受到各种干扰的影响,以至降低了后期的处理和解释精度。为此,寻求合适的滤波或去噪方法抑制其噪声成为亟待解决的问题。本文应用短时傅里叶变换STFT(Short Time Fourier Transform)分析去噪前后二次场信号的时频特性,为航空瞬变电磁信号去噪选择合适的滤波方法提供依据,并及时评价滤波效果。实验结果表明利用STFT对航空电磁数据处理是有效的可行的。
Airborne transient electromagnetic method is a quick survey of conductive metal ore geophysical method. Because of its high speed, low cost, large detection range and oth- er advantages, it has been a wide rangeof application in foreign countries. As a result of the two fiefds, the source is irrelevant and reflects the characteristics of the underground medium as the main aim at two field processing and interpretation. But the two fields of the effective energy are weak, so it is often affected by various interference effects so as to re- duce the later stages of processing and interpretation accuracy. Therefore, it becomes an urgent problem for seeking a suitable filter or denoising method to eliminate the noise. In this paper the application of the Short Time Fourier Transform （STFT） analyzes denoising before and after the two field signal time--frequency characteristics, for airborne transient electromagnetic signal denoising, the choice of the filtering method provides a basis and timely evaluation of filtering effect. The experimental results show that the way of using STFT for airborne electromagnetic data processing is effective and feasible.
出处
《工程地球物理学报》
2013年第1期15-20,共6页
Chinese Journal of Engineering Geophysics
基金
国家863高新技术研究发展计划项目(编号:2006AA06A205)资助
