可控源电磁探测的改进型正交检测算法

发布时间：2018-01-02 12:30

本文关键词：可控源电磁探测的改进型正交检测算法　出处：《吉林大学学报(工学版)》2016年06期 　论文类型：期刊论文

【摘要】：基于传统正交检测算法在以方波作为激励场源的可控源电磁探测信号幅度与相位提取的不足之处,提出了改进型的正交检测算法。分析了改进型正交检测算法的实现过程,讨论了高通特性大地介质的影响,并针对这些特点,设计了匹配的低通滤波器和降采样率的采样方法,保证了改进型正交检测精度。实测结果表明:改进型正交检测算法具有可行性,且相对于正弦正交检测的幅度误差为0.01%~0.72%,相位误差保证在4°的范围内;相对于方波正交检测算法,检测精度至少提高了一个数量级。改进型正交检测算法在对数据量较大的时域采集信息进行处理时,因无需进行乘法运算、实时性较高、具有较低的硬件要求,且能抑制高通特性大地介质的影响,而在可控源电磁探测中具有良好的应用前景。
[Abstract]:The traditional orthogonal detection algorithm as the excitation amplitude and phase field defects signal controlled source electromagnetic source detection in square wave based on the proposed orthogonal detection algorithm improved. Analyzes the implementation process of the improved orthogonal detection algorithm, the effect of high frequency dielectric on earth, and in the light of these features, design low pass filter, and down sampling sampling rate method, the improved orthogonal detection accuracy. The measured results show that the improved orthogonal detection algorithm is feasible, and relative to the amplitude error detection for 0.01%~0.72% orthogonal sinusoidal phase error, which in the range of 4 DEG; compared with orthogonal square wave detection algorithm, the detection accuracy. By at least one order of magnitude. The improved orthogonal detection algorithm in data acquisition time domain more information processing, because without the need for multiplication of high real time It has low hardware requirements and can inhibit the influence of high pass characteristics of geodetic medium, and has a good application prospect in controllable source electromagnetic detection.

【作者单位】：吉林大学仪器科学与电气工程学院;国家地球物理探测仪器工程技术研究中心;
【基金】：国家潜在油气资源产学研用合作创新研究项目(OSR-02) 吉林省科技厅发展计划重点项目(20100349)
【分类号】：P631.325
【正文快照】： 130061)0引言可控源电磁探测方法是在人工激励场源的作用下,通过电场和磁场传感器获取地下介质电磁信息的方法。这些方法包括可控源音频大地电磁法(Controlled source audio-frequency magnetotelluric,CSAMT)[1]、激发极化法(Induced Polarization,IP)和复电阻率法等,它们被

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