伪随机源直升机航空电磁宽频低噪接收优化设计  

Optimization design of broadband and low noise receiving for helicopter⁃borne electromagnetic method with pseudo⁃random coded waveforms

作　　者：王言章[1,2] 刘明 张嘉霖 朱凯光[1,2] 邓守鹏 王世隆[1,2] WANG Yan-zhang;LIU Ming;ZHANG Jia-lin;ZHU Kai-guang;DENG Shou-peng;WANG Shi-long(Key Laboratory of Geo-exploration Instruments,Ministry of Education of China,Changchun 130061,China;College of Instrumentation&Electrical Engineering,Jilin University,Changchun 130061,China)

机构地区：[1]吉林大学地球信息探测仪器教育部重点实验室,长春130061 [2]吉林大学仪器科学与电气工程学院,长春130061

出　　处：《吉林大学学报（工学版）》2023年第10期2982-2993,共12页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家重点研发计划项目(2018YFF01013303)。

摘　　要：针对200 kHz高频码元伪随机发射源,综合考虑灵敏度、信噪比等因素,在噪声水平低至4.86 nT/s前提下,将空心线圈传感器谐振频率提升至150 kHz以上;接收机基于PXIe总线,可实现三分量电磁数据、发射电流及辅助信息收录,采样率最高可达1.25 MHz,动态范围为112.6 dB。通过复合时间戳整合多通道信号、改进的多信息单文件存储方式,实现了大数据量下的多信息可靠存储,与传统的CHTEM-Ⅱ航空电磁收录系统相比,吞吐量提升了8倍。多种性能指标测试结果证明本文接收系统具有较高的完成度。In this paper,aiming at the pseudo-random transmitting current of 200 kHz clock frequency,comprehensively considering factors such as sensitivity,signal-to-noise ratio,the resonant frequency of the air-core coil sensor is increased to above 150 kHz when the noise level is as low as 4.86 nT/s;The receiver is based on the PXIe bus,which can realize the acquisition of three-component electromagnetic data,transmitting current and various auxiliary information.The sampling rate can reach up to 1.25 MHz,and the dynamic range is 112.6 dB.Through the integration of multi-channel signals,improved multi-information single-file storage method and data storage protocols through composite time stamping,reliable multi-information storage under massive data is realized.Compared with the CHTEM-Ⅱairborne electromagnetic recording system,the throughput is up to 6 times.The test results of various performance indicators prove that the receiving system has a high degree of completion.

关 键 词：测试计量技术及仪器 直升机航空电磁法 M序列 宽频低噪空心线圈传感器 高采样率接收机 

分 类 号：TH763[机械工程—仪器科学与技术]