A GPR system based on 3-level of "FPGA + DSP + PC" has been developed according to the real-time issue which considering of the advantages of FPGA and DSP. The system manages the data flow by 3-level pipeline structure, which increases the throughput of the system and processing speed. A comparatively complicated pre-processing method is based on lifting wavelet transform and realized on DSP, the result shows the system can satisfy the real-time demand. The validity and detection performances of the system...