基于非周期伪随机序列的可控震源信号调制技术
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摘要
从便于寻优的角度出发,给出了三元非周期伪随机序列的一种定义,提出了基于非周期伪随机序列的可控震源信号调制方法。该方法与二元m-序列调制方法相比,不存在地震数据资源的浪费问题。三元非周期伪随机序列通常比相同长度的二元非周期伪随机序列具有更小的边峰主峰比。地震数值模拟结果表明,将具有较小边峰主峰比的三元非周期伪随机序列调制生成的信号作为地震勘探中可控震源的发射信号,其地震响应剖面的相关噪声要比相同长度的二元非周期伪随机序列调制情形有明显的减弱。
A method to modulate seismic vibrator signals was proposed based on aperiodic pseudorandom sequences given a definition of ternary aperiodic pseudorandom sequence.Compared with binary m-sequence modulation,this method doesn't waste seismic data resources.Generally,a ternary aperiodic pseudorandom sequence has smaller ratio of side lobe to main lobe than a binary one.The simulation results show that the correlation noises in response section to the seismic vibrator signal modulated by ternary aperiodic pseudorandom sequence with smaller ratio of side lobe to main lobe are obviously weaker than that by binary aperiodic pseudorandom sequence with the same length.
A method to modulate seismic vibrator signals was proposed based on aperiodic pseudorandom sequences given a definition of ternary aperiodic pseudorandom sequence.Compared with binary m-sequence modulation,this method doesn't waste seismic data resources.Generally,a ternary aperiodic pseudorandom sequence has smaller ratio of side lobe to main lobe than a binary one.The simulation results show that the correlation noises in response section to the seismic vibrator signal modulated by ternary aperiodic pseudorandom sequence with smaller ratio of side lobe to main lobe are obviously weaker than that by binary aperiodic pseudorandom sequence with the same length.
引文
[1]Crawford J M,Doty W E N,Lee M R.Continuoussignal seismograph[J].Geophysics,1960,25(1):95-105.
[2]陶知非.改善可控震源高频信号输出品质的探讨[J].物探装备,2008,18(2):71-77.TAO Zhi-fei.Study on improving quality of high fre-quency output signal in vibroseis[J].EGP,2008,18(2):71-77.
[3]姜福豪,王德江.可控震源高分辨率地震勘探采集技术——以莫桑比克2005年项目为例[J].石油地球物理勘探,2007,42(2):127-131.JIANG Fu-hao,WANG De-jiang.Vibroseis’high-resolution seismic exploration acquisition techniques:case of Mozambique project in 2005[J].Oil Geophysi-cal Prospecting,2007,42(2):127-131.
[4]王忠仁,陈祖斌,姜弢,等.可控震源地震勘探的数值模拟[J].吉林大学学报:地球科学版,2006,36(4):627-630.WANG Zhong-ren,CHEN Zu-bin,JIANG Tao,et al.Numerical simulation for seismic exploration with vi-brator[J].Journal of Jilin University:Earth Science E-dition,2006,36(4):627-630.
[5]Goupillaud P L.Signal design in the“vibroseis”tech-nique[J].Geophysics,1976,41(6):1291-1304.
[6]王忠仁,陈祖斌,张林行,等.可控震源非线性扫描地震响应的数值模拟[J].地球物理学进展,2006,21(3):756-761.WANG Zhong-ren,CHEN Zu-bin,ZHANG Lin-hang,et al.Numerical simulation for seismic responseto nonlinear sweeping signal from a vibrator[J].Pro-gress in Geophysics,2006,21(3):756-761.
[7]Cunningham A B.Some alternate vibrator signals[J].Geophysics,1979,44(12):1901-1921.
[8]Becquey M,Bianchi T,Meunier J.Pseudo-random co-ded simultaneous vibroseismics[C]//SEG AnnualMeeting Expanded Technical Program Abstracts withBiographies.Salt Lake City:[s.n.],2002:77-80.
[9]万哲先.代数和编码[M].北京:科学出版社,1976.WAN Zhe-xian.Algebra and coding[M].Beijing:Sci-ence Press,1976.
[10]Linder J.Binary sequences up to length 40 with bestpossible autocorrelation function[J].Electron Lett,1975(11):507.
[2]陶知非.改善可控震源高频信号输出品质的探讨[J].物探装备,2008,18(2):71-77.TAO Zhi-fei.Study on improving quality of high fre-quency output signal in vibroseis[J].EGP,2008,18(2):71-77.
[3]姜福豪,王德江.可控震源高分辨率地震勘探采集技术——以莫桑比克2005年项目为例[J].石油地球物理勘探,2007,42(2):127-131.JIANG Fu-hao,WANG De-jiang.Vibroseis’high-resolution seismic exploration acquisition techniques:case of Mozambique project in 2005[J].Oil Geophysi-cal Prospecting,2007,42(2):127-131.
[4]王忠仁,陈祖斌,姜弢,等.可控震源地震勘探的数值模拟[J].吉林大学学报:地球科学版,2006,36(4):627-630.WANG Zhong-ren,CHEN Zu-bin,JIANG Tao,et al.Numerical simulation for seismic exploration with vi-brator[J].Journal of Jilin University:Earth Science E-dition,2006,36(4):627-630.
[5]Goupillaud P L.Signal design in the“vibroseis”tech-nique[J].Geophysics,1976,41(6):1291-1304.
[6]王忠仁,陈祖斌,张林行,等.可控震源非线性扫描地震响应的数值模拟[J].地球物理学进展,2006,21(3):756-761.WANG Zhong-ren,CHEN Zu-bin,ZHANG Lin-hang,et al.Numerical simulation for seismic responseto nonlinear sweeping signal from a vibrator[J].Pro-gress in Geophysics,2006,21(3):756-761.
[7]Cunningham A B.Some alternate vibrator signals[J].Geophysics,1979,44(12):1901-1921.
[8]Becquey M,Bianchi T,Meunier J.Pseudo-random co-ded simultaneous vibroseismics[C]//SEG AnnualMeeting Expanded Technical Program Abstracts withBiographies.Salt Lake City:[s.n.],2002:77-80.
[9]万哲先.代数和编码[M].北京:科学出版社,1976.WAN Zhe-xian.Algebra and coding[M].Beijing:Sci-ence Press,1976.
[10]Linder J.Binary sequences up to length 40 with bestpossible autocorrelation function[J].Electron Lett,1975(11):507.
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