航空瞬变电磁接收信号提取同步脉冲电路  

Circuit of extracting synchronous pulse signal from airborne transient electromagnetic receiving signal

作　　者：王浩 李军峰[1] 吴珊[1] 刘俊杰[1] 刘磊[1] 曹展宏 章勇 WANG Hao;LI Junfeng;WU Shan;LIU Junjie;LIU Lei;CAO Zhanhong;ZHANG Yong(Electromagnetic Detection Technology Key Laboratory of Ministry of Natural Resources,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China)

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所自然资源部地球物理电磁法探测技术重点实验室,河北廊坊065000

出　　处：《电子设计工程》2021年第3期179-183,共5页Electronic Design Engineering

基　　金：国家863计划项目(2017YFC0601900);基本科研业务费专项经费项目(JYYWF20180103)。

摘　　要：为了解决航空电磁勘测数据夹杂的各种噪声严重影响数据处理和解释的问题,设计了一种由接收信号有效提取同步脉冲的电路。在固定翼时间域吊舱系统中,为了精准控制舱内数据,需要发射机与接收机之间的同步脉冲信号。该电路应用在数据预处理阶段,目的是为了提高接收数据的信噪比。接收信号经过滤波电路,去除掉15 Hz以下和40 Hz以上的噪声;通过绝对值电路由双极性变为正向单极性波形,随后经比较器电路变为脉冲波;经过分频变为单脉冲,也就得到了同步脉冲信号。经过测试和验证,接收信号波形与经过调试电路提取的脉冲波形的边沿电平时刻一致,实现了从接收信号中精确提取同步脉冲的方法。In order to solve the problem that various noises mixed in the airborne electromagnetic survey data seriously affect the data processed and interpreted,a circuit is designed to effectively extract the synchronization pulse from the received signal.In general,in a bird system of the fixed-wing time-domain,a synchronous pulse signal between the transmitter and receiver is required in order to process the data in the cabin accurately.The circuit is applied in the stage of data preprocessed to improve the signal-to-noise ratio.The received signal passes through the filter circuit to remove the noise below 15 Hz and above 40 Hz;the signal is changed from bipolar to positive unipolar waveform by the absolute value circuit and then to pulse wave by the comparator circuit;It becomes a single pulse after frequency division,and the synchronization pulse signal is obtained.The field test and experiment prove that the edge levels of the received signal waveform and the pulse waveform extracted by the debugging circuit are consistent at all times.So,the method that the synchronous pulse is extracted accurately from the received signal is realized.

关 键 词：航空电磁勘测数据 数据预处理 吊舱 同步脉冲 

分 类 号：TN72[电子电信—电路与系统]