A methodology for identification of an object located on the ground using its natural resonant frequencies from both time and frequency domain data is presented. This methodology is then applied to generate a library of poles of various perfectly conducting objects (PEC) using the Cauchy method in the frequency domain and compare them with the computed natural poles of an unknown object on the ground using the typical transient temporal late time response using the Matrix Pencil (MP) method in the time domain. By comparing both of them, one can identify the unknown object on the ground. For identification of an object on the ground, one transmitter and two receivers are utilized and each of the antennas is considered to be a dipole antenna. Simulation example is analyzed to illustrate the potential of this proposed methodology.