| 脉冲编码可控震源信号设计 |
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| 引用本文： | 王忠仁,高健,孙锋.脉冲编码可控震源信号设计[J].地球物理学进展,2008,23(6):1931-1935. |
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| 作者姓名： | 王忠仁 高健 孙锋 |
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| 作者单位： | 吉林大学仪器科学与电气工程学院地球信息探测仪器教育部重点实验室,长春,130026 |
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| 基金项目： | 国家高技术研究发展计划(863计划)
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| 摘 要： | 通过脉冲编码技术使震源向地下激发出可人为控制的变步长的脉冲序列,采用解码技术将这种连续多次小能量激发情形的原始地震记录转换为等价的单次大能量激发的地震记录.文中通过数值模拟技术对脉冲编码震源信号地震响应的规律和特点进行了研究.模拟结果表明,脉冲编码信号冲击间隔的增量是压制相关噪声的关键因素,调整冲击间隔的增量对相关噪声的影响要比增加冲击次数对相关噪声的影响灵敏得多,而重复的冲击间隔对压制相关噪声不起任何作用.
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| 关 键 词： | 脉冲编码 可控震源 伪随机序列 相关噪声 数值模拟 |
| 收稿时间： | 2008-2-16 |
| 修稿时间： | 2008-5-20 |
Signal design for controllable seismic source by pulse coding |
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| WANG Zhong-ren,GAO Jian,SUN Feng.Signal design for controllable seismic source by pulse coding[J].Progress in Geophysics,2008,23(6):1931-1935. |
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| Authors: | WANG Zhong-ren GAO Jian SUN Feng |
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| Abstract: | With the pulse coding technique, a series of pulses, which are produced by a controllable impact source and have the variable time intervals, are introduced into the ground. The seismic recording from a series of many low-power impact pulses can be transformed into a recording that is equivalent to the one from high-power impact pulse by using decoding techniques. The characteristics of seismic response to pulse coding signal are investigated by numerical simulating. The results show that the increment in the value of pulse interval between two neighboring impacts in a coded signal is a key factor for suppressing correlation noise. Changing the increment of impact interval is more sensitive to suppressing correlation noise than increasing the times of impacting. But repeated impact intervals do not have any effect on weakening the correlation noise. |
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| Keywords: | pulse coding controllable seismic source pseudo-random sequence correlation noise numerical simulating |
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