Iterative Time-Reversal Mirror Method for Imaging the Buried Object Beneath Rough Ground Surface

Abstract

Abstract-An iterative Time-Reversal Mirror (TRM) method is proposed to Detect and Image the buried target beneath ground surface. Unlike the conventional TRM methods which treat the information of the ground as clutters and directly delete them, the iterative TRM imaging method proposed in this paper utilizes the information of rough ground surface as a useful knowledge. The new approach is consisted of two TRM procedures. In the first TRM procedure, it aims to image the rough surface where the propagation environment for electromagnetic wave is free space. The second TRM procedure aims to image the buried target. In this step, the information of the rough surface estimated by the first TRM procedure will be treated as newly updated propagation environment. Then conventional TRM is applied to image the buried target. By applying this iterative TRM method, the information of the rough ground can be well considered in the whole TRM procedure. Numerical simulations prove that this method performs significantly better image contrast comparing with the results obtained by using conventional TRM. 4-5 dB improvement on the imaging SNR has been achieved. Furthermore, the target can be located more accurately.

An Investigation on Numerical Characterization of Scattering From Target in a Dielectric Rough Soil Surface

“…The presented scheme is meaningful for the topics related with the composite scattering characteristics extraction, passive remote sensing and electromagnetic inverse scattering problem, most of which are carried out based on the acquisition of plenty of calculated data under multi-parameters in a more efficient extent. Based on this scheme, our future work will focus on the further investigation of the buried object detection [35] and passive remote sensing [36], owning to their potential application in ground-penetrating radar, military, landmine detection, and environment remote sensing etc.…”

Multi-Feature Based Detection of Landmines Using Ground Penetrating Radar

“…Moreover, if the ground has a rough surface such as in the real field, or if part of a landmine is embedded in a rough surface, a reflection pattern from the ground, which is significantly different from that considered in this work, would be obtained. For this case, methods such as [59] and [60] needs to be taken into account in the proposed method. It is expected that if the proposed method is evaluated and refined through extensive tests with various landmines and ground conditions, the false alarm rate could be further reduced.…”

Moving Target Tracking Using Time Reversal Method

“…The time reversed magnetic field is: (20) Equations (19) and (20) show that in the presence of a uniformlymoving dipole source, electromagnetic field focusing only obtained when R(−t) = 0, i.e., along the time-reversed trajectory. Previous result can be best illustrated by the visualization of the time-domain progress of the backward propagations as in Fig.…”

“…The capability of time reversal method in focusing waves attracts many applications ranging from remote sensing, imaging or wireless communication [3][4][5][6][7][8][9][10][11]. Since the need for tracking of moving targets in strongly cluttered environments arises in many radar applications, including intruder detection systems and through the wall microwave imaging [12][13][14][15][16][17][18][19][20], the effect of source motion on time reversal focusing is critical. In this paper, we address the problem of time reversal focusing of electromagnetic waves in case of moving source.…”