带噪声参考道的人工源电磁信噪分离方法研究

人工源电磁勘探广泛应用于资源勘探和地质调查，然而，近年来强人文噪声干扰日益严重（尤其是在矿集区、城市附近区域），而现有数据处理方法针对强人文噪声效果不佳，极大限制了人工源电磁方法在上述区域的应用。为此，本研究从人工源电磁信号的周期性特征和电磁场分布特征出发，拟提出一种带噪声参考道的人工源电磁信噪分离方法，具体为针对干扰较大区域，增加一组噪声观测装置，以特定角度旋转该观测装置，使其不采集来自人工源信号，只采集“纯”噪声信号。该装置采集数据与正常勘探数据具有同一位置、同时观测、不同角度特点，两者所含噪声具有高度同源性和相似性，基于该噪声数据时频特征，建立观测区域内实时噪声冗余字典库，通过正交匹配追踪实现该噪声数据的稀疏分解，获得不同时段噪声对应匹配字典库，以噪声匹配字典为基础，建立目标函数求解勘探数据中的噪声，实现电磁勘探数据的高质量信噪分离，以提高强人文噪声下的人工源电磁数据信噪比。

Controlled source electromagnetic exploration has been widely used in resource exploration and geological survey, but serious culture noise interference is aggravated, especially in mining areas, cities, other regions. Existing data processing methods are not effective for complex continuous culture noise, The effect of controlled-source electromagnetic exploration is greatly affected. Under this situation, the applicant intends to design a denoising method for controlled-source electromagnetic exploration signals based on the regional distribution characteristics and signal periodic characteristics. Add a set of simultaneous measurement of "pure" noise electric field observation device, specifically by rotating a certain measurement angle so that it does not measure the signal transmitted from the controlled source, only measure the "pure" noise signal, and use it as the noise reference point in this area. Noise reference point data and survey observation data have the same location, simultaneous measurement, and different angle measurement characteristics. Based on this, this study first uses the orthogonal matching pursuit method to sparsely decompose the reference point data into basic noise atoms to construct the noise in this area. Based on this matching dictionary, we try to solve the noise components in the survey observation data, so as to improve the signal-to-noise separation of survey data.