摘要
在某一时刻和某一空间接收点记录的数据具有一定的瞬时频率动态范围。当数据瞬时频率动态范围小于采集接收器和仪器的动态范围时，可同时记录强振幅的频率信息和较弱振幅 频率信息；当数据瞬时频率动态范围大于采集接收器和仪器的动态范围时，就只能记录强振幅的频率信息。为克服这一问题，通常采用仪器前置滤波器衰减强能量的频率信息，减小数 据瞬时频率动态范围，达到记录弱信号的能力。另外还可增加地震仪器的记录位数，增加 仪器的瞬时记录动态范围。文中进行了时频统计和频时统计定量分析，从中得到信号频率 不同，其瞬时频率动态范围有较大差异的结论。因此，在野外采集时，正确使用仪器前置 滤波参数 是非常重要的。
The recording data of the receiver at a certain moment and a certain position ha ve a certain dynamic range of temporal frequency,and when the later is less th an the dynamic range of acquisition receiver and apparatus,we can record both strong and weak frequency information.When dynamic range of temporal frequency of data are wider than dynamic range of acquisition receiver and apparatus,we can only record frequency information with strong amplitude.In order to ov ercome this problem,the prefilter of apparatus is generally used to attenuate frequency signal with strong energy, reduce dynamic range of temporal frequency of data so that the capacity of recording weak signal can be achieved.On the o ther hand,we can also increase in number of recording bits of seismic apparat us to increase in temporal recording dynamic range of apparatus in order to over come the problem.The time frequency and frequency time statistic analysis have been done in the paper.It is known from this analysis that different signal fr equency can result in wide difference in dynamic range of temporal frequency, so that correct using prefilter parameters of apparatus are very important in fi eld acquisition.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2001年第4期438-443,共6页
Oil Geophysical Prospecting
关键词
大地吸收衰减
仪器前置滤波
时频统计分析
频时统计分析
地震勘探
attenuation by earth absorption,prefiltering of apparatus,time frequency statis tic analysis,frequency time statistic analysis
