基于C31数字信号处理器的高精度新型地震数据采集站

A New Type of High Precision Seismic Data Acquisition UnitsBased On DSP TMS320C31

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 multistage decimation filters and realtime realization of decimation filtering with TMS320C31 chips are emphasized on.Finally,some experimental results are presented.