南极长城站地磁自动化台站系统

Automatic geomagnetic observatory in Antarctic Great Wall Station

南极长城站地磁观测站是我国首次建成的地磁自动化台站。本文简要地叙述了系统的构成、工作原理和设计思路。地磁自动化台站系统包括３台ＧＭ－２单分量磁通门磁力仪，用来记录地磁场三分量的变化，分辨率为０．０５ｎＴ，采样间隔为６ｓ，１台分量质子磁力仪，用于进行基线值测量，分辨率０．１ｎＴ，采样间隔为６ｍｉｎ。安装在ＰＣ机内的数据采集卡进行Ａ／Ｄ转换和数采采集。本文还介绍了地磁数据采集和常规处理的程序。

An automatic geomagnetic observatory system of Antarctic Great Wall Station is described. The system consists of a type GM 2 fluxgate magnetometer which produces of three field elements( D. H. Z )output with a resolution of 0.05 nT and a sampling interval of 6 s. A vector proton magnetometer is installed to provide the baseline reference measurement at a resolution of 0.1 nT with a sampling interval of 6 min. A data acquisition card which build in a PC computer convert the analog signal of the fluxgate to digital output through three of 4.1/2 A/D converters. The data of both fluxgate and proton magnetometers are conllected by the data acquisition system and recorded on the floppy disk under the specially designed software control. A 3.5' floppy disk can record 9 day′s data. The programs has been developed for transfer the data to a standard format and for geomagnetic observatory routine data processing.