强干扰环境下的大地电磁时间序列处理过程
Seismology and Geology（2022）
Abstract
天然源的大地电磁信号易受干扰影响,导致阻抗估计结果不准确,这种难以克服的缺陷制约着大地电磁法的应用范围.随着工业化发展,人文干扰越发严重,传统的数据处理方法已经不能改善强电磁干扰环境下的数据质量.文中结合大地电磁数据处理的基本理论对中国东部强干扰地区实测数据进行了处理.分析了稳健估计(Robust)处理、分段叠加处理和分时处理等技术的处理效果,总结了不同干扰情况下的数据处理方案.对于不同干扰特征的数据,要综合分析Robust处理对数据的影响,灵活应用Robust处理.为得到更好的处理结果,应适当增加数据采集时间,特别是夜间干扰较弱时段的数据采集时间.此外,增加数据分段的个数,提供更多可供编辑的功率谱也是得到优质数据的必要条件.
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