1. School of Geophysics and Measurement-control Technology, East China University of Technology, Nanchang, Jiangxi 330013, China; 2. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, Jiangxi 330013, China
Abstract：To fully utilize the three-component magnetic field information of the ground-airborne frequency-domain electromagnetic method, this paper proposes a ground-airborne frequency tipper sounding method by referring to the magnetotelluric tipper measurement technology. Starting from the full-space magnetic field formula of the horizontal electric dipole in the one-dimensional (1D) layered medium, we derive the expressions of the two components Tx and Ty of the ground-airborne frequency-domain tipper, and the 1D forward modeling of a typical layered model is conducted to analyze the response characteristics of the ground-airborne frequency tipper. Through the analysis on the forward modeling results of the uniform half-space model and 1D layered model, the following conclusions are drawn:① The tipper response is symmetric along the field source direction and vertical direction as a whole, and the distortion effect of the field source and the transition zone exists si-multaneously; ② With the increase in transmitter-receiver distance, the tipper response form basically remains unchanged, and the amplitude decreases rapidly; ③ The amplitude of the imaginary part of the tipper remains unchanged while the amplitude of the real part drops rapidly as the flight height changes; ④ The vertical variation of the resistivity of underground media can be effectively studied by measuring the tipper response of different frequencies; ⑤ The ground-airborne frequency tipper sounding method should be applied at a long distance to avoid the distortion effect area as far as possible, and components Tx and Ty should be rationally selected for interpretation. The theoretical feasibility and effectiveness of this method are proved by simulation analysis, and this method could be a possible development way for the ground-airborne electromagnetic method.
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