Research On Application Of SDR Ground Penetrating Radar Based On FMCW

With the development of GPR technology,GPR has gradually improved to the direction of low cost,miniaturization and reconfigurable,such as in the process of coal mining for disaster detection in advance.However,the traditional GPR equipment is usually realized by pure hardware,which often has problems such as large volume and poor detection flexibility.Aiming at the above problems,this paper designs a small GPR system with strong versatility and high openness.According to the implementation mechanism of software radio radar,a software radio ground penetrating radar system based on FM continuous wave is designed.Based on the analysis of the requirements of the system,the system is modeled and its functions are analyzed.Secondly,the overall structure of the system is designed according to the analysis of the FM continuous wave signal and the study of the modulation and demodulation algorithms of the software radio GPR signal.In the hardware part,based on Spartan 6 FPGA and AD9361 chip,the RF front end,baseband processing unit,interface circuit and clock circuit of the system are designed.The software part is designed in GNU Radio,which mainly includes the generation,transmission and transmission of radar signals as well as the reception of signals.The transmitted signals adopt FM continuous wave signals with high resolution and strong anti-jamming ability.The system has the characteristics of wide applicability,open structure and reconfigurable function.Finally,the test environment of the GPR system is set up,and the simulation and experiment of the system are carried out.The results of multi-group simulation test on the system show that the software radio GPR system based on FM continuous wave is feasible,the designed system has small volume,high degree of software,and adopts the sawtooth wave detection with low transmission power consumption to meet the detection requirements,and can identify multiple targets.