相关辨识谱激电法及野外实验

发布时间：2018-05-19 02:19

  本文选题：编码源电磁法 + 相关辨识　； 参考：《地球物理学进展》2017年03期

【摘要】：与常规互相关法辨识系统脉冲响应的方法不同,本文提出了一种直接由循环互相关法辨识系统频率特性的方法,用于地球物理谱激电法勘探.具体方法是:采用编码源信号为激励波形,运用循环互相关法可恢复出系统的频率响应.仿真计算结果表明:本方法在强干扰条件下可高精度辨识出待辨识系统的频率响应,较高的采样率和叠加次数可有效提高测量精度.野外谱激电法实验中,采用编码源激发,中间梯度装置,最大供电极距5200 m,接收电极距20 m,阵列式同步采集,供电电流8 A条件下,在强干扰工作区获得了可靠的视电阻率、相对相位和金属因素剖面异常.通过实测数据分析:该方法有助于提高系统频率响应的辨识精度,且有很高的频率分辨率;增加采样周期数是在强干扰区获得高质量数据的有效途径.
[Abstract]:Different from the conventional cross-correlation method, this paper presents a method to identify the frequency characteristics of the system directly by the cyclic cross-correlation method, which is used for geophysical spectral IP exploration. The specific method is that the frequency response of the system can be recovered by using the coded source signal as the excitation waveform and the cyclic cross-correlation method. The simulation results show that the method can identify the frequency response of the system with high precision under strong interference, and the high sampling rate and stacking times can effectively improve the measurement accuracy. In the field experiment, the source excitation, the intermediate gradient device, the maximum power supply pole distance of 5200 m, the receiving electrode distance of 20 m, the array synchronous acquisition, the power supply current of 8 A, and the reliable apparent resistivity are obtained under the condition of strong interference working area. The relative phase and metal factor profile are abnormal. Through the analysis of the measured data, the method is helpful to improve the identification accuracy of the system frequency response and has a high frequency resolution, and increasing the number of sampling periods is an effective way to obtain high quality data in the strong interference region.
【作者单位】： 甘肃省有色地质调查院;中国地质大学(北京)信息工程学院;中南大学地球科学与信息物理学院;
【基金】：相关辨识技术在谱激电中的应用研究(41374185)资助
【分类号】：P631.3
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本文编号：1908280