海底大地电磁探测仪数据采集软件

来源期刊：中南大学学报(自然科学版)2002年第2期

论文作者：陈儒军 白宜诚 邓明

文章页码：111 - 115

关键词：数据采集;软件;滤波;海底大地电磁探测仪

Key words：data capture; software; filtering; ocean-bottommagnetotelluric instrument

摘    要：根据研制的HD-1型海底大地电磁探测仪的特点和海底大地电磁数据采集要求,开发了高可靠性的海底大地电磁数据采集软件.软件由参数设置、数据采集与抽样、误侦测与处理3部分组成.参数设置部分处理用户输入的各种参数,纠正输入参数中的各种错误,并写入控制寄存器中,可靠地实现采样频率、放大倍数、滤波器和陷波器控制;数据采集与抽样根据用户输入参数控制海底大地电磁信号的采集,当用户设置的采样频率低于仪器硬件的最低采样频率时,根据用户设置的采样频率对采集的数据进行实时抗混叠滤波和抽样;误侦测与处理部分,对仪器运行中所出现的各种错误和用户参数设置中的各种异常情况进行自动处理,保证海底大地电磁数据采集可靠进行.

Abstract: According to the requirement of ocean-bottom magnetotelluric data capture and characteristic of newly developed ocean bottom magnetotelluric instrument, data capture software with high reliability is developed. The software is composed of three subsystems such as parameter setting, data capture and down sample, error detecting and correcting.The subsystem of parameter setting processes all kinds of user input parameters, corrects different user input errors, and writes correct parameters to control registers of instrument. The above measure offers a safe way to control sample frequency, gain, low-pass filter and notch filter of instrument. Data capture and down sample subsystem realizes the sampling of ocean bottom magnetotelluric signal at different sample frequency according to user input parameter, and realizes real-time anti-alias filter and down sample based on user input sample frequency when user set frequency is lower than the lowest sample frequency of hardware of instrument. And the error detecting and correcting subsystem pays great attention to the special ocean bottom environment in which user can no thandle instrument when instrument samples data in ocean bottom,processes different errors caused by instrument itself and user input parameter, ensures safe and reliable data capture of ocean bottom magnetotelluric signal. The instrument is used to carry out experiment in ocean-bottom successfully.