应用多次匹配滤波技术进行垂向位场分离

位场信号的径向平均对数振幅谱可以由多条斜率不同的直线段拟合，直线的斜率即为相应的等效层的深度。当相对于某一参考面，场源深度相对地相差不多时，在对数振幅谱上就难以将其区分，而经过匹配下延处理，场源的深度发生相对变化，选择适当的下延深度，在对数振幅谱上又可区分，此时经第二次匹配滤波又可进一步细分位场信号。这一过程可以反复进行，直到满意为止。这即为多次匹配滤波的思想。最后本文对沙市实测布格重力异常进行了两次匹配滤波处理，比较合理地分离出由基底起伏盐系地层引起的异常

VERTICAL SEPARATION OF POTENTIAL FIELD BY USING MULTIPLE MATCHED-FILTER

The radially averaged log amplitude spectrum of potential field can be modeled by lines with different slopes, which are the depths of the corresponding equivalent source layers. With a reference surface, if the depths of different sources are nearly the same, their spectra cannot be distinguished. However, the spectra can be separated again after the secondly matched-filter with appropriately downword continued depth. The process can be done several times till the best result is shown. This is the multiple matched filter. The Shashi gravity anomaly is processed by matched-filter two times in the paper, the anomalies caused by the bottom of basin and the salt layers are separated reasonably.