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

ShiJie WANG, GuoHong FU, Hui CHENG, LiJuan YANG, ChuKang YONG

Prog Geophy ›› 2024, Vol. 39 ›› Issue (4) : 1687-1697.

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Prog Geophy ›› 2024, Vol. 39 ›› Issue (4) : 1687-1697. DOI: 10.6038/pg2024HH0291

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

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Abstract

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.

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ShiJie WANG , GuoHong FU , Hui CHENG , et al . Research on arbitrary waveform electromagnetic signal transmission technology based on digital power amplifier[J]. Progress in Geophysics. 2024, 39(4): 1687-1697 https://doi.org/10.6038/pg2024HH0291

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