Abstract：The multi-transient electromagnetic (MTEM) method can achieve good anti-noise performance with transmitted waveform coded by m-sequence.However,m-sequences with different coding parameters have different anti-noise performance.First,we reveal significant differences in the identification precision of different coding parameters.Then we build an identification system by constructing a model of the identification progress.For the identification system,the input is an impulse to the earth,and the output is the response of the impulse.The noise attenuation at a specific frequency can be quantitatively analyzed by the amplitude-frequency response of the identification system.Based on this method,effects of coding parameters on the anti-noise performance are summarized by numerical simulation and the coding parameter optimization is further discussed and concluded.Field experiments demonstrate the validity of the proposed method and coding parameter optimization conclusions.
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