Radio wave penetration tomography based on the centroid frequency downshift
基于质心频移的无线电波透视层析成像

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.