超宽带SAR浅地表地雷聚焦与定位技术
doi: 10.3724/SP.J.1146.2006.00404
Focusing and Locating of Subsurface Landmines in Ultra-wideband SAR
-
摘要: 机载或车载超宽带合成孔径雷达可以大区域快速探测单个地雷和雷场，是探雷的发展趋势。由于传统成像算法基于均匀媒质的假设，在浅地表目标成像中不再适应。该文首先建立了浅地表目标回波模型，定量分析了折射和色散对成像的影响。基于回波模型，提出了分别在回波域和图像域补偿折射和色散影响的浅地表后向投影(Subsurface Back-Projection, SBP)成像算法。但是对未知区域进行地雷探测时，无法获得目标埋设深度和入射角先验信息。针对这个问题，提出了基于图像域SBP成像算法的粗、精补偿分级处理流程，实现了大区域多目标精确聚焦定位。最后利用Rail-GPSAR探雷试验系统实测数据验证了该文方法的有效性。Abstract: Air- or vehicle-borne Ultra-WideBand Synthetic Aperture Radar (UWB SAR) can detect landmines or minefields over large area quickly, which is a trend of landmine detection. Traditional image formations, based on even medium assumption, are not suitable to the subsurface target imaging. In this paper, a subsurface target echo model is firstly developed to analyze the refraction and dispersion effects on imaging quantitatively. Based on the model, Subsurface Back-Projection (SBP) image formation is used to compensate the refraction and dispersion effects in echo domain and image domain, respectively. Unfortunately, prior knowledge of target buried depth and incident angle cannot be obtained in landmine detection over undiscovered areas. In order to solve the problem, a hierarchical processing procedure with coarse and fine compensation is proposed on SBP image formation in image domain, which realizes multi-target focusing and locating over wide areas. Finally, the proposed methods are verified using real data collected with the Rail-GPSAR landmine detection experimental system.
-
Montoya T P and Smith G S. Land mine detection using a ground-penetrating radar based on resistively loaded Vee dipoles[J].IEEE Trans. on Antenna and Propagation.1999, 47(12):1795-1806[2]Zoubir A M, Iskander D R, and Chant I, et al.. Detection of landmines using ground penetrating radar[J].Proceedings of SPIE.1999, 3710(II):1301-1312[3]刘光平. 超宽带合成孔径雷达高效成像算法. [博士论文], 长沙: 国防科学技术大学, 2003. Liu Guang-ping. Efficient imaging algorithm of ultra-wideband synthetic aperture radar. [phD], Changsha: National University of Defense Technology, 2003.[4]Rau R and McClellan J H. Analytic models and postprocessing techniques for UWB SAR[J].IEEE Trans. on Aerospace and Electronic Systems.2000, 36(4):1058-1074[5]Blackham, D V and Pollard R D. An improved technique for permittivity measurements using a coaxial probe. IEEE Trans. on Instr. Meas., 1997 46(50): 1093-1099.[6]Peplinski N R, Ulaby F T, and Dobson M C. Dielectric properties of soils in the 0.3-1.3-GHz range. IEEE Trans. on Geoscience and Remote Sensing, 1995, 33(3): 803-807.[7]Peplinski N R, Ulaby F T, and Dobson M C. Corrections to Dielectric properties of soils in the 0.3-1.3GHz range. IEEE Trans. on Geoscience and Remote Sensing, 1995, 33(6): 1340. -
计量
- 文章访问数: 3624
- HTML全文浏览量: 89
- PDF下载量: 810
- 被引次数: 0
下载:
