Distributed wide field electromagnetic method based on high-order 2^(n) sequence pseudo random signal  

基于高阶2^(n)序列伪随机信号的分布式广域电磁法

作　　者：Yang YANG Ji-shan HE Fan LING Yu-zhen ZHU 杨洋;何继善;凌帆;朱裕振(山东大学岩土与结构工程研究中心,济南250061;香港中文大学(深圳)城市地下空间及能源研究院,深圳518172;中南大学地球科学与信息物理学院,长沙410083;山东省煤田地质规划勘察研究院,济南250109)

机构地区：[1]Geotechnical and Structural Engineering Research Center,Shandong University,Ji’nan 250061,China [2]Institute of Urban Underground Space and Energy Studies,The Chinese University of HongKong,Shenzhen 518172,China [3]School of Geosciences and Info-Physics,Central South University,Changsha 410083,China [4]Shandong Coal Geological Planning and Exploration Research Institute,Ji’nan 250109,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第5期1609-1622,共14页中国有色金属学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(No.42004056);the Natural Science Foundation of Shangdong Province,China(No.ZR2020QD052);China Postdoctoral Science Foundation(No.2019M652386)。

摘　　要：To make three-dimensional electromagnetic exploration achievable,the distributed wide field electromagnetic method(WFEM)based on the high-order 2^(n) sequence pseudo-random signal is proposed and realized.In this method,only one set of high-order pseudo-random waveforms,which contains all target frequencies,is needed.Based on high-order sequence pseudo-random signal construction algorithm,the waveform can be customized according to different exploration tasks.And the receivers are independent with each other and dynamically adjust the acquisition parameters according to different requirements.A field test in the deep iron ore of Qihe−Yucheng showed that the distributed WFEM based on high-order pseudo-random signal realizes the high-efficiency acquisition of massive electromagnetic data in quite a short time.Compared with traditional controlled-source electromagnetic methods,the distributed WFEM is much more efficient.Distributed WFEM can be applied to the large scale and high-resolution exploration for deep resources and minerals.为实现三维电磁探测,提出一种基于高阶2^(n)序列伪随机信号的分布式广域电磁探测方法。该方法在勘探时只需要发射一组高阶伪随机波形,即可获得所有目标探测频率。发射波形可以根据勘探任务定制;采集终端独立接收信号,能够根据实际情况对采集参数动态调整。在齐河−禹城深部富铁矿的野外勘探试验表明,分布式广域电磁法能够实现短时间海量电磁数据的高效获取。与传统电磁勘探方法相比,基于高阶伪随机信号的分布式广域电磁法野外勘探效率更高。该方法能够应用于深部资源与矿产的大规模精细探测。

关 键 词：distributed wide field electromagnetic method(WFEM) high-order pseudo-random signal MULTIFREQUENCY massive data 

分 类 号：P631.325[天文地球—地质矿产勘探]