Title :
Time-reversal based detection of buried objects in waveguide environments
Author :
Xiang Pan ; Hui Shu ; Yuanxin Xu ; Nan Wang
Author_Institution :
Inst. of Inf. & Commun. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
For improvement of detection of a buried object in shallow water, a robust time reversal detection approach is proposed. Time reversal processing (TRP) is commonly applied for signal enhancement in a homogenous medium. In this paper, time reversal focusing in non-homogenous media is theoretically analyzed based on a wave propagation equation. From the perspective of beamforming, TRP is equivalent to active matched field processing (MFP). It is necessary to consider the robustness of TRP in an uncertain environment. Thus an optimum algorithm with multiple constraints is combined with the TRP scheme for designing time reversal beams to ensonify a target of interest. The tank experimental results verify the theoretical analysis of time reversal focusing in layered media. The proposed time reversal processing scheme works well in detection of a buried object in a waveguide tank. Moreover, by robust time reversal we can achieve a processing gain of 11.8 dB.
Keywords :
array signal processing; buried object detection; electromagnetic wave propagation; inhomogeneous media; shallow water equations; MFP; TRP; active matched field processing; beamforming; buried object detection; gain 11.8 dB; homogenous medium; layered media; nonhomogenous media; optimum algorithm; robust time reversal detection approach; shallow water; signal enhancement; time reversal beam; time reversal focusing; time reversal processing; wave propagation equation; waveguide environment; waveguide tank; Acoustics; Array signal processing; Buried object detection; Focusing; Media; Oceans; Robustness;
Conference_Titel :
Advanced Computational Intelligence (ICACI), 2012 IEEE Fifth International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4673-1743-6
DOI :
10.1109/ICACI.2012.6463347