| 胡玉平,鲍光淑.一种改善MT低频数据质量的方法及其应用[J].地质与勘探,2002,(3):46-48 |
| 一种改善MT低频数据质量的方法及其应用 |
| A METHOD TO ENHANCE QUALITY OF LOW - FREQUNCE MT DATA AND ITS APPLICATION |
| 修订日期：2002-02-01 |
| DOI： |
| 中文关键词: 低频数据质量 小波变换 奇异性分析 低频电磁干扰 大地电磁测深 信噪比 |
| 英文关键词: MT, wavelet transform, singularity analysis, low - frequency electromagnetic disturbance |
| 基金项目: |
| 胡玉平 鲍光淑 |
| 中南大学资源环境与建筑工程学院，长沙410083 |
| 摘要点击次数: 1874 |
| 全文下载次数: 1078 |
| 中文摘要: |
| 电磁干扰是影响大地电磁测深方法（MT）数据质量的主要因素。目前，除从仪器电路上考虑压制50Hz的工业干扰外，主要的压制干扰的方法为近，远参考的ROBUST技术，它对高频电磁干扰或随机干扰有明显的压制作用。但在强干扰地区（通常具有很强的低频电磁干扰，如长，短脉冲和方波等低频干扰），低频数据的质量仍然很差，这是因为在低频数据处理时，强的低频电磁干扰使得级联分样后的数据发生了强的崎变，与实际的有用信号相差甚远，从MT时序数据出发，提出了应用小波变换的方法，重组低频干扰并加以消除，达到提高信噪比的目的，经实际资料处理证明，此方法效果明显。 |
| 英文摘要: |
| Electromagnetic disturbance is one of primary factors affecting data quality acquired by MT. In addition to suppressing 50Hz industrial dis-turbance by apparatus circuits, the main method to suppress the disturbance is the near - remote reference Robust technique which effectively suppresseshigh - frequency electromagnetic disturbance or random disturbance. However, it is difficult to enhance data quality in the area affected by strong low -frequency electromagnetic disturbances like long or short impulses and rectangle waves. Those cause series - related decimated data strong aberrant duringthe data processing, and the data have much difference with the usefu1 signals in practice. Based on the time - order MT data, 1ow-frequency disturb-ance signals are reconstructed and eliminated using wavelet transformation in order to increase s/n ratio. This method proves effective during the data pro-cessing in practice. |
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