The localization of buried targets using Ground Penetrating Radar (GPR) is dealt with. The bi-static GPR is made of two identical Vivaldi antennas operating from 0.5 GHz to 3.5 GHz and installed in front of a sand box. The experimental data acquired in a controlled laboratory environment are validated by electromagnetic simulation. Then, both synthetic and experimental data are processed to detect the buried targets via three imaging methods. The targets localization is achieved from the GPR B-scan data. The results obtained via Stripmap SAR, Frequency-Wavenumber (F-K) migration and Kirchhoff migration are presented and compared.