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摘要
In order to design a pseudo-random coded magnetic source transient electromagnetic system, the design of the system and the forward and inverse methods used by the system in a uniform half-space earth model were discussed from the perspective of key technologies and electromagnetic theory. First, the characteristics of the four kinds of pseudo-random codes were compared and analyzed, and the m sequence was selected as the excitation signal of the system. Then the system transmission circuit was designed based on the active constant voltage clamping technology to perform the electromagnetic response of the measured data. According to the identification theory of the m-sequence pseudo-random coding system, the response waveform was preprocessed to obtain the estimated value of the earth impulse response and compared with the standard value. The results show that the magnetic source transient electromagnetic system can overcome the obstruction of inductive loads and emit a pseudo-random coded current with high waveform quality; if the current waveform has good autocorrelation, and even if the current waveform is distorted to a certain degree, the estimated value of the earth impulse response that is very close to the theoretical value can be obtained, and the preprocessing result does not completely depend on the pseudo-random coding current waveform.
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