论文详情
提出一种基于一致性函数的检波器性能评估方法，对常规速度检波器和加速度计检波器的性能矩阵进行评估，以提高地震监测和勘探应用质量。同时介绍了传递函数分析法以及延时互相关分析法这两种检波器性能评估方法。分析传递函数分析法、延时互相关分析法和一致性函数法发现：传递函数分析法和延时互相关分析法分别从频率域和时间域分析评估检波器的性能;传递函数分析法需要同时分析检波器输出的幅频特性和相频特性，涉及较多的参数,不能直观地评估检波器的性能;延时互相关分析法则需要计算多组数字时移，存在计算量较大的问题。相比于前面两种方法,一致性函数法是一种综合性的检波器性能评估方法，该方法基于频率域中输入信号以及经过检波器的输出信号的变化程度，将多个待分析变量统一为一个归一化变量——一致性函数值（取值范围为0～1），消除了输入信号和输出信号之间变化幅度的影响，只单纯反映两个信号每单位变化时的相似程度。解决了现有检波器性能评估方法中存在的复杂的参数比较和计算量大的问题，更加直观以及全面地评估检波器的性能。
The coherence function is used to examine the performance matrix of two types of sensors,namely accelerometers and conventional geophones,for seismic monitoring and survey applications.Furthermore,this paper also introduces the transfer function analysis method and lagged cross correlation method.Comparison and analysis of these three methods show that transfer functions method and lagged cross correlation method evaluate the performance of sensors in the frequency domain and time domain,respectively.The transfer functions method requires analysis of both amplitude-frequency and phase-frequency characteristics of the sensor output;it involves too much parameter comparison and cannot intuitively evaluate the performance of sensors.Lagged cross correlation method involves calculating multiple sets of digital time delay,and has high computing cost.The proposed sensor evaluation system based on the coherence function is a comprehensive method.It uses the difference of the input and the sensor output signals in the frequency domain,to unify multiple variables into one normalized variable,the normalized variable is the consistency function whose value ranges from zero to one,so as to eliminate the effect of the amplitude difference between the input and output signal.The proposed method can help mitigate the issues of high computational cost and complex parameters comparison,and can evaluate the performance of sensors more intuitively.