Circuit of automatic gain control for airborne transient electromagnetic receiving signal

WANG Hao; LI Junfeng; LIU Junjie; WU Shan; LIU Lei; CAO Zhanhong

doi:10.13443/j.cjors.2018120301

Volume 34 Issue 4

Aug. 2019

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CHINESE JOURNAL OF RADIO SCIENCE > 2019 > 34(4): 524-530. > DOI: 10.13443/j.cjors.2018120301

WANG Hao, LI Junfeng, LIU Junjie, WU Shan, LIU Lei, CAO Zhanhong. Circuit of automatic gain control for airborne transient electromagnetic receiving signal[J]. CHINESE JOURNAL OF RADIO SCIENCE, 2019, 34(4): 524-530. doi: 10.13443/j.cjors.2018120301

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Circuit of automatic gain control for airborne transient electromagnetic receiving signal

Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Electromagnetic Detection Technology Key Laboratory of Ministry of Natural Resources, Langfang 065000, China

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Received Date: December 02, 2018
Available Online: December 30, 2020
Published Date: August 29, 2019

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Abstract

In order to improve the sensitivity of the airborne transient electromagnetic signal, an implementation method of suppressing the coil motion noise and controlling the gain of the secondary field was proposed. Based on field programmable gate array (FPGA), the module of generating control signals was designed. On this basis, the circuit of signal conditioning was designed. Comparing with the preset threshold voltage, the motion noise was identified and removed, and the timing control was used to amplify the secondary field. The results show that the device can zero the baseline of the received signal waveform, and effectively increase the secondary field gain.
- airborne transient electromagnetic signal,
- secondary field,
- coil motion noise,
- FPGA,
- timing control

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