基于C31数字信号处理器的高精度新型地震数据采集站
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摘要
基于ＴＭＳ３２０Ｃ３１数字信号处理器设计了一种新型的地震数据采集站。该采集站用过采样Ａ／Ｄ转换器作为数据采集的模数转换器件，采用两片ＴＭＳ３２０Ｃ３１构成流水线式的多级实时抽取滤波器，对采集的信号进行实时滤波抽取处理，将采集站的瞬时动态范围提高到１２０ｄＢ。介绍了地震采集站的结构，根据过采样Ａ／Ｄ转换器采样率很高的特点，着重说明了多级抽取滤波器的设计方法以及采用ＴＭＳ３２０Ｃ３１实现实时滤波抽取的过程，最后给出了试验结果。
Based on TMS302C31 digital signal processors (DSP),a new type of seismic data acquisition units is designed by using oversampling A/D converters as A/D converting devices of data acquisition.With two TMS320C31 chips,a pipe line multistage realtime decimation filter is made to decimate and filter the acquired signal at realtime.The instantaneous dynamic range of a acquisition unit is raised up to 120 dB.A configuration of the acquisition uint is described,and ,according to the features of the oversampling A/D converters,design methods for multistage decimation filters and realtime realization of decimation filtering with TMS320C31 chips are emphasized on.Finally,some experimental results are presented.
Based on TMS302C31 digital signal processors (DSP),a new type of seismic data acquisition units is designed by using oversampling A/D converters as A/D converting devices of data acquisition.With two TMS320C31 chips,a pipe line multistage realtime decimation filter is made to decimate and filter the acquired signal at realtime.The instantaneous dynamic range of a acquisition unit is raised up to 120 dB.A configuration of the acquisition uint is described,and ,according to the features of the oversampling A/D converters,design methods for multistage decimation filters and realtime realization of decimation filtering with TMS320C31 chips are emphasized on.Finally,some experimental results are presented.
引文
1刘益成．地震信号的时频特性与瞬时动态范围．石油物探，1996，35（1）：66～702CandJC，TemesGC．OversamplingMethodsforA／DandD／AConversion，IEEEPres，19913CrochiereRE，RabinerLE．MultirateDigitalSignalProcessing．NewJersey：Prentice－Hal．Inc，19834刘益成，戴成军．梳状滤波器以及在△转换器中的应用，石油仪器．1995，9（2）：63～68
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