丰宁台FHD仪背景噪声减小措施分析

Analysis of Background Noise Reduction Measures of FHD Instrument in Fengning Station

针对丰宁台FHD仪记录曲线毛刺较多、背景噪声偏大的问题,对观测环境、供电、信号线、仪器自身性能等逐一排查,发现主要是受交流供电干扰和信号线过长的影响。经过处理后,降低了背景噪声,提高了观测的精度。通过该分析,总结出降低FHD仪背景噪声的部分经验,有望在其他地磁台站推广应用。

In view of the problems of many burrs and large background noise in the recording curve of the FHD instrument in Fengning station,the observation environment,power supply,signal line and the performance of the instrument were checked one by one,and it was found That the recording was mainly affected by the interference of AC power supply and the long signal line.After processing,the background noise is reduced and the observation accuracy is improved.Based on this analysis,some experience of reducing the background noise of FHD instrument is summarized,which is expected to be applied in other geomagnetic stations.