时分采样实现三分量地震数据并行同步采集

为降低三分量地震信号并行同步采样系统功耗并压缩其体积,结合数字信号处理中的采样率变换理论,提出以时分采样系统实现三分量地震信号的并行同步采集方案;该方案通过对三组时分采样结果做三倍插值将其转换为并行同步采样序列,再经信号插值或抽取实现数据采样率由系统采样率向目标采样率的转换。误差分析表明该转换过程数值计算精度已优于系统硬件分辨率。该方案突出特点是可优化带限信号并行同步采样系统功耗和成本,提高系统性能。

Three-component Parallel and Synchronous Seismic Data AcquisitionBased on Time-division Sampling System

In order to economize power dissipation and volume of the three-component parallel and synchronous seismic data acquisition system, under the inspiration of sampling rate conversion theory in the digital signal processing, a project of three-component parallel and synchronous seismic data acquisition method is proposed based on time-division sampling system, and in which triple interpolation is implemented in the three sets of data acquired by time-division sampling. Then another interpolation or decimation is carried out with the aim at converting sampling rate of the system into the target value. Results of the error analysis show that the accuracy of numerical calculation in this conversion process is superior to the resolution ratio of hardware system. Prominent dominant of this project is that power dissipation and volume of parallel and synchronous acquisition system applied to band-limited signal are optimized, and performance of the whole system is improved.