Experimental Measurement and Analysis of Atmospheric Coherence Length in Xi''''an Area

2020 ◽  
Vol 57 (9) ◽  
pp. 090101
Author(s):  
吴鹏飞 Wu Pengfei ◽  
贾璐瑶 Jia Luyao
Keyword(s):  
Experimental Measurement ◽  
Coherence Length ◽  
Measurement And Analysis

UWB propagation channel experimental measurement and analysis

2009 ◽  
Author(s):  
Yujie Zeng ◽  
Behshad Memari ◽  
Melanie Biggs ◽  
Clive Harding ◽  
Bahram Honary
Keyword(s):  
Experimental Measurement ◽  
Propagation Channel ◽  
Measurement And Analysis

Experimental Measurement and Analysis of Pulse Transmission Source of GPR

2012 ◽  
Vol 503-504 ◽  
pp. 1365-1368
Author(s):  
Hui Xu ◽  
Guo Rui Wu
Keyword(s):  
Experimental Measurement ◽  
Pulse Width ◽  
Duty Ratio ◽  
Trigger Pulse ◽  
Actual Measurement ◽  
The Core ◽  
Pulse Transmission ◽  
Shallow Soil ◽  
Measurement And Analysis ◽  
Rf Transistor

According to the transmission pulse requirements of the impulse-GPR which probes the objectives of shallow soil, a transmission circuit is designed and made. On the basis of the transistor avalanche theory, avalanche transistor and RF transistor are used to generate the impulse-GPR transmission pulse as the core transistors. Trigger pulse is the square wave which is produced by FPGA as the trigger of whole system, its duty ratio under 10% and its frequency from 50 kHz to 500 kHz. As the results of simulation and actual measurement shown, single transistor avalanche circuit and four transistors cascade avalanche circuit can produce a narrow pulse with its pulse width from 1.337ns to 42.91ns. The results meet the transmission pulse requirements of impulse-GPR which probes the objectives of shallow soil.

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