Tham khảo luận văn - đề án 'báo cáo hóa học: "radio frequency interference suppression for landmine detection by quadrupole resonance"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 29890 Pages 1-14 DOI ASP 2006 29890 Radio Frequency Interference Suppression for Landmine Detection by Quadrupole Resonance Guoqing Liu Yi Jiang Hong Xiong Jian Li and Geoffrey A. Barrall Department of Electrical and Computer Engineering University of Florida . Box 116130 Gainesville FL 32611-6130 USA Received 24 August 2004 Revised 26 June 2005 Accepted 30 June 2005 The quadrupole resonance QR technology can be used as a confirming sensor for buried plastic landmine detection by detecting the explosives within the mine. We focus herein on the detection of TNT mines via the QR sensor. Since the frequency of the QR signal is located within the AM radio frequency band the QR signal can be corrupted by strong radio frequency interferences RFIs . Hence to detect the very weak QR signal RFI mitigation is essential. Reference antennas which receive RFIs only can be used together with the main antenna which receives both the QR signal and the RFIs for RFI mitigation. The RFIs are usually colored both spatially and temporally and hence exploiting only the spatial diversity of the antenna array may not give the best performance. We exploit herein both the spatial and temporal correlations of the RFIs to improve the TNT detection performance. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION The quadrupole resonance QR technology has been receiving increasing attention for explosive detection in applications including landmine detection 1-4 . It can be used as a confirming sensor for buried plastic landmine detection by detecting the explosives . trinitrotoluene TNT and Royal Demolition explosive RDX within the mine. In this paper we focus on the detection of TNT via the QR sensor. When the 14N in the TNT is excited by a sequence of pulses it will emit a signal consisting of a sequence of echoes 1 5 . This signal has a unique .
