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In this work, we have presenteda focusing algorithm for tree-penetrating radar applications. The details of our imaging and focusing algorithm to detect cavities inside a treebody were given. First, the algorithm has been tested with the simulation data that were generated by the help of perfect point scatterers. Then, the algorithm was applied to the measurement data that have been collected from a laboratory set-up. The resultant radargram of the measured data has demonstrated the effectiveness and the success of the proposed algorithm.

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