Quantitative analysis of the anti-noise performance of an m-sequence in an electromagnetic method
Quantitative analysis of the anti-noise performance of an m-sequence in an electromagnetic method
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DOI：
10.1088/1742-2140/aa889c
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发表时间：
2018-02
影响因子：
1.4
通讯作者：
Zhenzhong Yuan;Yiming Zhang;Q. Zheng
中科院分区：
文献类型：
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作者：
Zhenzhong Yuan;Yiming Zhang;Q. Zheng
与传统的方波方法相比，采用m序列编码的发射波形的电磁方法具有更好的抗噪声性能。不同编码参数下的them序列的抗噪性能不同，因此需要对不同编码参数下的them序列的抗噪性能进行定量分析，以优化them序列。本文提出了一种辨识系统的概念，通过测量系统的输出与输入的电压响应得到被辨识的大地冲击响应。通过分析相应辨识系统的幅频响应，定量分析了它们的抗噪性能。通过数值仿真总结了编码参数对抗噪性能的影响，并进一步讨论了编码参数的优化问题;通过现场实验进一步验证了结论的有效性。本文提出的定量分析方法为研究地震序列的抗噪机理提供了新的思路，也可用于地震等其他时域勘探方法中人工震源抗噪性能的评价。
An electromagnetic method with a transmitted waveform coded by anm-sequence achieved better anti-noise performance compared to the conventional manner with a square-wave. The anti-noise performance of them-sequence varied with multiple coding parameters; hence, a quantitative analysis of the anti-noise performance form-sequences with different coding parameters was required to optimize them. This paper proposes the concept of an identification system, with the identified Earth impulse response obtained by measuring the system output with the input of the voltage response. A quantitative analysis of the anti-noise performance of them-sequence was achieved by analyzing the amplitude–frequency response of the corresponding identification system. The effects of the coding parameters on the anti-noise performance are summarized by numerical simulation, and their optimization is further discussed in our conclusions; the validity of the conclusions is further verified by field experiment. The quantitative analysis method proposed in this paper provides a new insight into the anti-noise mechanism of them-sequence, and could be used to evaluate the anti-noise performance of artificial sources in other time-domain exploration methods, such as the seismic method.