High frequency electromagnetic experiment based on spread spectrum coded signals
In view of the lack of shallow electromagnetic detection instruments in the current market,this paper designs a high-frequency electromagnetic exploration system based on the principle of spread-spectrum coding and carries out detection experiments of shallow geological bodies.Firstly,the advantages of using the coded signal generated by inverse repetitive m-series spread spectrum as the field source are discussed,and the hardware system is designed based on this coding scheme;finally,a comparative field experiment is conducted in the tailings pond of Hunan Baoshan Non-ferrous Metals Mining Co.,Ltd.The experimental results show that the coded signals emitted by the transmitter are high in frequency,dense in frequency and wide in frequency band;the signals obtained by the receiver are stable and reliable;the transmitter-receiver data have strong anti-interference capability after inter-correlation,which can efficiently obtain rich information of shallow geological bodies;the corresponding processing of the field experimental data and the results of the 2D geoelectric sections obtained match with the known geological data,indicating that the system can be applied in shallow The corresponding processing of the field experiment data and the obtained 2D geoelcctric section results are in good agreement with the known geological data,indicating that the system can be applied to shallow surface exploration with the advantages of fast observation speed,high resolution and strong anti-interference ability.
Spread spectrumHigh frequency electromagnetic explorationShallow geological bodiesField experiments
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