摘要
用国际上先进的高精度数字化磁通门 ,在距上海市地铁交通线的不同距离处进行了野外观测 ,对上海地区地磁观测环境进行了实测试验和分析。结果显示 ,城市地铁交通对其周围的地磁观测环境具有较大的影响。分析了地铁列车运行时段在地磁观测中高频成分所呈现的干扰信号空间形态特征、幅度大小、随时间变化的规律 ,得出这种干扰信号随着距离地铁交通的远近不同而出现的噪音衰减特征 ,从而为识别地磁台站观测中的地铁等轨道交通干扰噪音给出了有意义的依据。
The experimental geomagnetic observation is hold in the field where the distance from the subway of Shanghai varies differently by utilizing the advanced digital fluxgate magnetometer.This paper has analyzed and discussed the observation environments of geomagnetic field in Shanghai area.The results show that the subway of the city has significant influence for the observation environments of geomagnetic field.The spatial form and amplitude as well as the time variation of the noise signals have been analyzed.The attenuation characteristics of the noise signals with the distance from the subway and the meaningful basis for discrimination of noise signals from records have been obtained.
出处
《地震地磁观测与研究》
2004年第5期24-29,共6页
Seismological and Geomagnetic Observation and Research
关键词
地磁场
地铁
地磁观测环境
噪音信号
geomagnetic field,subway,observation environments of geomagnetic field,noise signals
