Title :
Application of Equivalent-Time Sampling Combined with Real-Time Sampling in UWB Through-Wall Imaging Radar
Author :
Chen, Chao ; Wu, Shiyou ; Meng, Shengwei ; Chen, Jie ; Fang, Guangyou ; Yin, Hejun
Author_Institution :
Inst. of Electron., Beijing, China
Abstract :
Experiments show that ultra-wideband (UWB) through-wall imaging radar enables good penetration capabilities operating in the frequency range 0.3GHz to 3GHz. According to Shannon sampling theorem, signal acquisition unit only be able to acquire a signal with at least 6GS/s sampling frequency utilizing real-time sampling electronics. It is difficult to find such A/D converter chip in practice. Taking it into account that ultra-wideband through-wall imaging radar transmits signal repeatedly, this paper proposes a method of applying equivalent-time sampling combined with real-time sampling in UWB radar to acquire the echo signal. An ultra-wideband through-wall imaging radar which embeds a PC104 as its main control unit and a FPGA as its timing controller is developed based on this method. The application shows that the ultra-wideband signal can be sampled and recovered with the use of this method.
Keywords :
analogue-digital conversion; field programmable gate arrays; image sampling; information theory; radar imaging; signal detection; ultra wideband radar; A-D converter chip; FPGA; Shannon sampling theorem; UWB through-wall imaging radar signal transmission; echo signal; equivalent-time sampling application; frequency 0.3 GHz to 3 GHz; main control unit; real-time sampling electronic; sampling frequency; signal acquisition; timing controller; ultrawideband through-wall imaging radar signal transmission; Field programmable gate arrays; Imaging; Radar imaging; Real time systems; Ultra wideband radar; FPGA; UWB Through-Wall Imaging Radar; delay line; equivalent-time sampling; real-time sampling;
Conference_Titel :
Instrumentation, Measurement, Computer, Communication and Control, 2011 First International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-0-7695-4519-6
DOI :
10.1109/IMCCC.2011.183