摘要
本文介绍了一种DAI数字带通滤波器,这种滤波器能根据数据处理需要选择滤波参数。参数确定后,可计算出滤波器的频率响应,根据频率响应的好坏确定是否重新选择滤波参数,直到满意为止。滤波的误差可以在滤波器设计中给定,适当增加褶积的项数即滤波器的长度,可以使滤波的误差很小。本文用这种方法处理了地下水位观测资料,消去固体潮汐的影响。其效果比用潮汐理论值校正的方法消去潮汐影响更好。本文还用频移的方法将这种带通滤波器变成低通滤波器,用来消去视电阻率的年变化。直接用带通滤波提取水氡观测值中周期在半个月到两年的变化成分。这种滤波方法在以上应用中均得到了较好的效果。
This paper introduces a DAI digital bandpass filter which can select filtering parameters according to the data processing need. After parameters defined, the frequency response of the filter can be computed; if the frequency response is not Rood, one may reselect the filtering parameters till it is satisfactory. The filtering error can be given in the filter design, if the convolution term is properly increased, namely the filter length increases, the filtering error can be minimized. The author has processed the observed data of groundwater level and eliminated the effect of solid tide using this method. The effect of this method is better than that of eliminating tidal influence by the adjustment method of tidal theory value. This paper also changes such bandpass filter into low-pass filter using carrier shift method to eliminate the yearly variation of apparent resistivity. The bandpass filter has been directly ased to extraet the varied elements of the hydro-radon observation value in periods of half a month to two years. Such filtering method has obtained good effects in the above applications.
出处
《地震》
CSCD
北大核心
1991年第1期51-58,80,共8页
Earthquake
