| 基于相关辨识的逆重复m序列伪随机电磁法 |
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| 引用本文： | 汤井田,罗维斌.基于相关辨识的逆重复m序列伪随机电磁法[J].地球物理学报,2008,51(4):1226-1233. |
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| 作者姓名： | 汤井田 罗维斌 |
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| 作者单位： | 1.中南大学信息物理工程学院，长沙 410083;2.长安大学地质工程与测绘学院，西安 710054 |
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| 基金项目： | 国际大洋科技攻关计划，国家高技术研究发展计划(863计划) |
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| 摘 要： | 分析了变频法和2n系列伪随机电磁法的场源信号特点，提出了基于相关辨识的逆重复m序列伪随机电磁法.逆重复m序列伪随机信号具有与白噪声类似的自相关函数，在频带内，频谱等间距均匀分布.由Wiener-Hopf方程，分析了逆重复m序列伪随机相关辨识大地系统冲激响应的原理.理论证明，合理地选择产生逆重复m序列的几个参数可以很好地压制各种干扰，高精度地辨识大地系统.讨论了影响测量精度与勘探分辨率的信号参数设计原则，为进一步研制具有自主产权的高分辨精细电磁勘探仪器和方法奠定了基础.
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| 关 键 词： | 逆重复m序列伪随机信号 相关辨识 冲激响应 干扰压制 |
| 收稿时间： | 2007-3-30 |
| 修稿时间： | 2008-3-30 |
Pseudo-random electromagnetic exploration based on Invert-Repeated m-Sequence correlation identification |
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| TANG Jing-Tian,LUO Wei-Bin.Pseudo-random electromagnetic exploration based on Invert-Repeated m-Sequence correlation identification[J].Chinese Journal of Geophysics,2008,51(4):1226-1233. |
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| Authors: | TANG Jing-Tian LUO Wei-Bin |
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| Institution: | 1.School of Info-physics and Geomatics Engineering, Central South University, Changsha 410083, China;2.School of Geological Engineering and Geomatics, Chang′an University, Xi′an 710054, China |
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| Abstract: | By analyzing the source signal characteristics of electrical prospecting using frequency varying or 2~n series pseudorandom signal,a novel electromagnetic method based on system identification using Invert-Repeated m-pseudo-random binary Sequence(IRmPRBS)is introduced. The IRmPRBS signal has the similar auto-correlation with white noise and the spectrum distributed at same space within its wide bandwidth.Derived from Wiener-Hopf equation,the elements of the earth impulse response correlation identification using IRmPRBS signal is analyzed.It is proved that properly selecting the parameters including the length of sequence, clock frequency,and so on for IRmPRBS signal generation can result in a good interference suppressing and a higher resolution for earth electrical system identification.We also studied the signal parameters selection principle for good measuring precision and exploration resolution.In a word,this paper is the groundwork to develop the new method and instruments for electrical exploration with higher precision and resolution. |
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| Keywords: | Invert-repeated m-pseudorandom binary sequence(IRmPRBS) Correlation identification Impulse response Interference suppressing |
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