Estimation of wall parameters based on range profiles

Compensation of wall effects is of main concern in SAR through-wall sensing. Wall parameters are essential for the compensation, which are normally not known a priori. A model of SAR working in side-looking strip mode for through-wall imaging is established, with the path of signal due to refraction taken into consideration. Through analyzing the echo configuration in time domain, a new procedure for estimating wall parameters using high range resolution profiles is provided. By extracting time delay of target counterpart, the thickness and permittivity of wall are figured out exactly by employing numerical equation method and intersecting of searching curves. With the estimated parameters, focused image of targets in a room is acquired after wall effects are compensated in imaging processing with back projection algorithm. Simulation results verify the validity of the theoretical analysis and imaging algorithm.

[1]  Lingjiang Kong,et al.  A new approach for target localization of through-the-wall radar with unknown walls , 2009, 2009 IEEE Radar Conference.

[2]  S. Kassam,et al.  Synthetic aperture beamformer for imaging through a dielectric wall , 2005, IEEE Transactions on Aerospace and Electronic Systems.

[3]  M.G. Amin,et al.  Imaging Through Unknown Walls Using Different Standoff Distances , 2006, IEEE Transactions on Signal Processing.

[4]  Hiralal Khatri,et al.  Estimation of electromagnetic parameters and thickness of a wall using synthetic aperture radar , 2007, SPIE Defense + Commercial Sensing.

[5]  Calvin Le,et al.  Identification of electromagnetic parameters of a wall and determination of radar signal level behind a wall , 2006, SPIE Defense + Commercial Sensing.

[6]  A. Muqaibel,et al.  A new formulation for characterization of materials based on measured insertion transfer function , 2003 .

[7]  Lingjiang Kong,et al.  Wall Parameters Estimation for Moving Target Localization with Through-the-Wall Radar , 2007, 2007 International Conference on Microwave and Millimeter Wave Technology.

[8]  M. Amin,et al.  New approach for target locations in the presence of wall ambiguities , 2006, IEEE Transactions on Aerospace and Electronic Systems.

[9]  Dong Wang,et al.  Rigorous analysis of the coaxial disk-loaded waveguide slow-wave structures , 2007, 2007 International Conference on Microwave and Millimeter Wave Technology.

[10]  A. Muqaibel,et al.  Ultra wideband material characterization for indoor propagation , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[11]  Kong Ling-jiang,et al.  Wall parameters estimation method for through-the-wall radar imaging , 2008, 2008 International Conference on Radar.

[12]  Erik M. Johansson,et al.  Three-dimensional ground-penetrating radar imaging using synthetic aperture time-domain focusing , 1994, Optics & Photonics.

[13]  Francesco Soldovieri,et al.  Three-Dimensional Through-Wall Imaging Under Ambiguous Wall Parameters , 2009, IEEE Transactions on Geoscience and Remote Sensing.

[14]  Moeness G. Amin,et al.  A novel technique to overcome wall ambiguities in through-the-wall radar imaging applications , 2005, Proceedings of the Eighth International Symposium on Signal Processing and Its Applications, 2005..

[15]  Lawrence M. Frazier,et al.  Radar surveillance through solid materials , 1997, Defense + Security Symposium.

[16]  J. Zhang,et al.  Extraction of dielectric properties of building materials from free-space time-domain measurement , 1999, MTT/ED/AP/LEO Societies Joint Chapter United Kingdom and Republic of Ireland Section. 1999 High Frequency Postgraduate Student Colloquium (Cat. No.99TH8409).

[17]  Kamal Sarabandi,et al.  Refocusing Through Building Walls Using Synthetic Aperture Radar , 2008, IEEE Transactions on Geoscience and Remote Sensing.

[18]  Sedki M. Riad,et al.  Ultrawideband through-the-wall propagation , 2005 .

[19]  I. D. Longstaff,et al.  Ultra-wideband widebeam SAR processing in the time-space domain , 1997 .

[20]  A. Nehorai,et al.  Estimating Moving Targets Behind Reinforced Walls Using Radar , 2008, IEEE Transactions on Antennas and Propagation.

[21]  G. Wang,et al.  A new approach for target location of through the wall radar imaging in the presence of wall ambiguities , 2004, Proceedings of the Fourth IEEE International Symposium on Signal Processing and Information Technology, 2004..