基于质心频移的无线电波透视层析成像  

Radio wave penetration tomography based on the centroid frequency downshift

作　　者：刘广亮[1] 于师建[2] 

机构地区：[1]煤炭科学研究总院西安研究院,西安710054 [2]山东科技大学,青岛266510

出　　处：《地球物理学进展》2008年第2期583-587,共5页Progress in Geophysics

摘　　要：介绍了质心频移的基本理论,在频域内对信号质心频移进行了数值模拟,数值模拟表明,接收信号的质心频率向零点发生了明显的漂移,验证了质心频移理论的正确性.对正方形异常体模型进行了频谱分析,可以看出穿过异常体的信号的振幅发生了明显的变化.根据正演模拟得到的数据,利用质心频移法对模型进行了层析成像,成像结果基本反映了异常体在模型中的位置,验证了质心频移法探测工作面异常体的有效性和可行性.This paper introduced the base theory of the centroid frequency downshift and carried through the numerical simulation in frequency domain. The numerical simulation manifested that the centroid frequency of received signal happened zero-shifting and proved the theory of centroid frequency downshift is right. The amplitude of received signals which crossed the abnormal body was affected obviously from the spectrum analysis made to the model which abnormal body is square. According to the data from forward simulation, the model was imaged with CT method using the centroid frequency downshift method. The section plans of CT imaging manifested that the abnormal body＇s position determined by the inversion method fitted well with the actual position in model, indicating that the inversion method of centroid frequency downshift are of effectivity and feasibility to detect the abnormity in the working face.

关 键 词：质心频移 无线电波透视 正演 层析成像 

分 类 号：P631[天文地球—地质矿产勘探]