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《Journal of Jilin University(Information Science Edition)》 2008-05
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Pulser Design in GPR for Tunnel Geology Forecast

ZOU Ai-min~a,b,CHENG De-fu~a,b,WANG Ke-ke~a,b,ZHAO Fei~a,b(a.College of Instrumentation and Electrical Engneering;b.Key Laboratory of Geo-Exploration and Instrumentation of Education Ministry,Jilin University,Changchun 130026,China)  
When GPR(Ground Penetrating Radar) is used in tunnel geology forecast,a narrow pulse is required as transmission signal.The narrow pulse must have large amplitude and suitable spectrum to meet the special request of enhancing the exploration distance.The principle of avalanche transistor is analyzed and two-stage series circuit based on avalanche transistor is designed to generate the narrow pulse.Experimental result shows that into the 50 Ω load the amplitude of the output pulse is 256 V and 3 dB bandwidth can match the UWB(Ultra Wide-Band) antennas with 100 MHz center frequency used in GPR.Repetition frequency of the pulse can reach to 100 kHz.The pulser can be made easily and works well.
【Fund】: 教育部骨干教师基金资助项目(406040000059)
【CateGory Index】: TN784;TN959
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