Multiple aperture mapdrift algorithm combined with time-frequency analysis for moving train imaging

A new autofocusing algorithm, i.e. multiple aperture mapdrift algorithm combined with time-frequency analysis technique is proposed and applied to moving train imaging. The train´s moving information is obtained by using time-frequency analysis. An extended mapdrift algorithm, multiple aperture mapdrift, is utilized to estimate the 3^rd order polynomial phase error, which is induced by the acceleration of the train. Experiment results show that the focusing performance of the algorithm is satisfied.