人工地震测深和天然地震流动观测兼用的轻便数字地震仪系统
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摘要
本文介绍一种新的轻便数字地震仪DAS1。其设计特点是:双微处理器硬件结构;过采样AD转换技术的运用;线性相位和最小相位FIR数字滤波的运用;大容量CMOS快闪存贮器作数据存储介质;GPS授时和内部高精度数字钟相结合的时间服务系统;采集器功耗低于065W。该仪器有3个信号输入通道,0~40Hz的带宽和16位字长。它可方便地用于人工地震测深及天然地震流动观测
The
    portable digital seismic acquisition system (DAS 1),which was developed by th e Research
    Center of Exploration Geophysics of China Seismological Bureau(CSB),i s presented in this
    paper. This system features three channels of recording with 16 bit Σ Δ AD converto r.The
    bandwidth of the system is 0~40Hz. Another characters of DAS 1 are as follows:Two
    microprocessor are used;Linear o r minimum phase FIR filter can be selected;Acquired data are
    stored in CMOS Flash Memory;The time service system consists of an external GPS receiver
    and an inte rnal clock;Power consumption of acquisition unit is less than 0 65W.There are 3
    trigger mode (timed,event and continuos) to be selected.Therefore,DAS 1 can be deployed in
    portable surveys for both DSS and earthquake observations.
引文
丁玉美、高西全、彭学愚,1994,数字信号处理,177~181,西安:西安电子科学出版社。胡广书,1998,数字信号处理———理论、算法与实现,179~187,北京:清华大学出版社。刘益成、罗维炳,1997,信号处理与过抽样转换器,66~67,北京:电子工业出版社。邵安民、张玉山、陈岳忠、殷洪山,1987,SSJ数字式地震事件记录器,地球物理学报,30(6),610~611。宗孔德、胡广书,1988,数字信号处理,303~321,北京:清华大学出版社。Ambuter,B.P.andSolemen,S.C,1974,Aeventrecordingsystemformonitoringsmalearthquakes,Bul.Seism.Soc.Amer.64:1181~1189.OliJosefson,1974,ApplicationofΣΔconverter,AnalogDialogue,28(1):20~22.

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