基于数字功放的任意波形电(磁)法信号发送技术研究  

Research on arbitrary waveform electromagnetic signal transmission technology based on digital power amplifier

作　　者：王世杰 付国红[1,2] 程辉[1,2] 杨利娟 雍楚康 WANG ShiJie;FU GuoHong;CHENG Hui;YANG LiJuan;YONG ChuKang(Engineering Research Center of Ministry of Education for Deep Sea and Deep Earth Mineral Resources Development Technology and Equipment,Hunan University of Science and Technology,Xiangtan 411201,China;Guangxi Provincial Key Laboratory of Concealed Metal Mineral Exploration,Guilin 541006,China)

机构地区：[1]湖南科技大学深海深地矿产资源开发技术与装备教育部工程研究中心,湘潭411201 [2]桂林理工大学广西隐伏金属矿产勘查重点实验室,桂林541006

出　　处：《地球物理学进展》2024年第4期1687-1697,共11页Progress in Geophysics

基　　金：国家自然科学基金(42074219);国家重点研发计划项目(2022YFF0706200);广西隐伏金属矿产勘查重点实验室(1207120K01);湖南省自然科学基金(2021JJ30241)联合资助。

摘　　要：针对桥式逆变发送机系统只能发送跳变的矩形波信号且接收回路易受电磁耦合尖峰干扰以及谐波污染等问题,设计了基于数字功放的任意波形电(磁)法信号发送方案,通过对低通滤波后的矩形波放大输出,显著降低发送机输出矩形波边沿变化率,压制人工源信号中高次谐波电流在接收机输入回路中引起的电磁耦合干扰,或直接对正弦波或组合正弦波信号放大输出以压制电磁耦合干扰、消除谐波污染.本文分析了电磁耦合产生机理,模拟计算了发送低通滤波处理后的矩形波对接收回路耦合尖峰的压制效果,搭建了基于数字功放的人工源电(磁)法信号发送装置,对包括低通滤波后的组合矩形波信号在内的任意波形信号进行放大输出测试,并以双频信号为例进行了感应耦合压制实验,取得了良好的实验效果,具有较重要的理论和实际应用价值.Aiming at the problem that the full bridge inverter transmitter system can only send jumping rectangular wave signals and is vulnerable to electromagnetic coupling spike interference and harmonic pollution in the receiving circuit,an arbitrary waveform electrical(magnetic)signal transmission device based on digital power amplifier is designed.For the low-pass filtered rectangular wave amplification output,it can significantly reduce the edge change rate of the rectangular wave output from the transmitter,suppress the electromagnetic coupling interference caused by the high-order harmonic current in the artificial source signal in the input of the receiver,or directly suppress the electromagnetic coupling interference on the sinusoidal wave or combined sinusoidal wave amplification output,and eliminate harmonic pollution.In this paper,the generation mechanism of electromagnetic coupling is analyzed,and the suppression effect of rectangular wave after low-pass filtering on the coupling peak of the receiving circuit is simulated and calculated.A signal transmission system based on digital power amplifier is built,which can amplify and output arbitrary waveform signals including the combined rectangular wave signal after low-pass filtering.Taking dual frequency signal as an example,the inductive coupling suppression experiment is carried out,It has achieved good experimental results and has important theoretical and practical application value.

关 键 词：电(磁)法勘探 数字功放 任意波形 发送机 电磁耦合尖峰 

分 类 号：P631[天文地球—地质矿产勘探]