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In this paper, FMCW (Frequency Modulation Continuous Wave) radar has been proposed for the underground survey. The FFT (Fast Fourier Transform) has high precision of receiving signal level; however, it could not give high resolution. On the other hand, MUSIC (Multiple Signal Classification) algorithm can resolve the super resolution but the precision of receiving signal level is lacking. So, the time domain response of MUSIC processing and IFFT (Inverse FFT) processing has been combined and termed as CPM (Combined Processing Method). The CPM has been implemented for the signal processing and image reconstruction of closely located GPR (Ground Penetrating Radar) targets. In order to support the proposal, a detailed simulation has been preformed analyzing SNR (Signal to Noise Ratio). Moreover, a laboratory experiment has also been performed for thorough investigation and support of the proposed method.

High Resolution Visualize Technique for Underground Survey Using GPR