可控震源的伪随机扫描与系统测试
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摘要
为满足地震信号分辨率和信噪比的要求,针对地震勘探用可控震源的特点,对伪随机编码扫描方式进行了研究。讨论了二元伪随机扫描工作方式的特点,并提出了三元伪随机扫描工作方式。研究了伪随机码的原理,给出了伪随机码的生成方法,利用得到的伪随机码设计了实际应用的伪随机码序列。将所研制的三元伪随机编码扫描信号发生器嵌入到电磁驱动可控震源上,并进行了实际测试,测试结果显示调制频率对最终的相关结果有很大影响。对得到的自相关函数的分析表明,采用三元伪随机编码扫描方式得到的信噪比比采用二元伪随机编码扫描方式提高了9%,得到了适用于地震勘探的伪随机编码扫描信号。
To improve the resolution and Signal to Noise Ratio(SNR) of seismic signals,the sweeping mode of pseudo-random code of a seismic vibrator was investigated.The sweeping mode of binary pseudo-random code was discussed,then a new sweeping mode for ternary pseudo-random code was presented.The principle of the pseudo-random code was researched and how to generate the pseudo-random code was given.Based on the obtained pseudo-random code,a pseudo-random code sequence was designed for practical applications.Furthermore,a signal generator of ternary sweeping for the pseudo-random code was embedded into the vibrator,and tested results show that modulation frequency has significant effects on the final self-correlation results.Analysis results on self-correlation function indicate that the SNR obtained from the sweeping mode of ternary pseudo-random code has been improved by 9% as compared with that of the sweeping mode of binary pseudo-random code,which means that obtained sweeping signals are suitable for the seismic exploration.
To improve the resolution and Signal to Noise Ratio(SNR) of seismic signals,the sweeping mode of pseudo-random code of a seismic vibrator was investigated.The sweeping mode of binary pseudo-random code was discussed,then a new sweeping mode for ternary pseudo-random code was presented.The principle of the pseudo-random code was researched and how to generate the pseudo-random code was given.Based on the obtained pseudo-random code,a pseudo-random code sequence was designed for practical applications.Furthermore,a signal generator of ternary sweeping for the pseudo-random code was embedded into the vibrator,and tested results show that modulation frequency has significant effects on the final self-correlation results.Analysis results on self-correlation function indicate that the SNR obtained from the sweeping mode of ternary pseudo-random code has been improved by 9% as compared with that of the sweeping mode of binary pseudo-random code,which means that obtained sweeping signals are suitable for the seismic exploration.
引文
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[2]CUNNINGHAM A B.Some alternate vibrator sig-nals[J].Geophysics,1979,44(12):1901-1921.
[3]CRAWFORD J M,WILLIAM E N,LEE M R.Continuous signal seisgraphy[J].Geophysics,1960,25:95-105.
[4]赵秀影,商玉凤,翟林培,等.基于EBCOT的平衡多小波航空图像压缩编码[J].光学精密工程,2007,15(11):1796-1801.ZHAO X Y,SHANG Y F,ZHAI L P,et al..Bal-anced multiwavelet aviation image compression cod-ing based on EBCOT[J].Opt.Precision Eng.,2007,15(11):1796-1801.(in Chinese)
[5]CHEN Z B,LIN J.Design for vibrator field experi-ment based on vibrator-earth system[J].Journalof Geoscientific Research in Northeast Asia,2000,3(1):107-113.
[6]肖国镇,粱传甲,王玉民.伪随机序列及其应用[M].北京:国防工业出版社,1985.XIAO G ZH,LIANG CH J,WANG Y M.Terna-ry Array and Application[M].Beijing:DefenseIndustry Press,1985.(in Chinese)
[7]万哲先.代数和编码[M].北京:科学出版社,1980.WAN ZH X.Algebra and Code[M].Beijing:Sci-ence Press,1980.(in Chinese)
[8]王忠仁,林君,冯声涯.地震勘探中相控阵震源的方向特性研究[J].地球物理学报,2006,49(4):1191-1197.WANG ZH R,LIN J,FENG SH Y.Directivity ofphase array vibrators in seismic exploration[J].Chinese J.Geophys,2006,49(4):1191-1197.(inChinese)
[9]苏金名,阮沈勇.MATLAB实用指南[M].北京:电子工业出版社,2002.SU J M,RUAN SH Y.Matlab Utility Guide[M].Beijing:Publishing House of Electronics Industry,2002.(in Chinese)
[10]李跃峰.AD9852的应用[J].火控雷达技术,2000,29(4):7-14.LI Y F.Applications of AD9852[J].Fire ControlRadar Techology,2000,29(4):7-14.(in Chinese)
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