Abstract
Aiming at the shallow underground detection, the digital filtering algorithm is used to calculate the electromagnetic response in the transition frequency band (1 kHz-1 MHz) between traditional electromagnetic method and ground penetrating radar. Through the normalized response calculation with displacement current, the influence of displacement current on airborne electromagnetic detection response in frequency domain is analyzed. The three-layer geodetic model is used to carry out forward modeling simulation of two typical geoelectric structures, and analyze their detection capability in the transition frequency band and detection depth at specific frequency. The results show that in the horizontal coplanar mode, when the offset is 6.5 m and the flight altitude is 30 m, the higher the frequency is, the greater the influence of high displacement current on the electromagnetic response is. In this frequency band, the low resistivity anomaly response is much greater than the high resistivity anomaly response. When the noise is 2 ppm, and the frequency is 50 kHz, it can effectively detect anomalies within 20 m underground.
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