FAST 3-D MICROWAVE IMAGING METHOD BASED ON SUBAPERTURE APPROXIMATION

In this paper, the subaperture approximation (SA) method for 3-D microwave imaging is presented based on the sparsity of 3-D image. The idea is that the sparsity information can be extracted from the lower resolution image obtained using the subaperture of the (virtual) array and be used for high-resolution imaging to reduce the imaging region. Thus, a recursion procedure that can signiflcantly reduce the computational cost is established. Compared with the surface-tracing-based method, the SA method can avoid the loss of isolated scatterers. The feasibility is verifled by using experimental data. After analysis, the SA method can reduce the computational cost from two aspects: reducing the array element number needed to be processed and the pixels needed to be processed. The computational cost is mainly related to the target characteristics (the sparsity ratio and the topological structure), and decreases with the increase of the sparsity ratio. When the sparsity ratio is larger than 97.6%, the computational cost can be lower than 10% of the 3-D back-projection (BP) method.

[1]  M. Soumekh,et al.  3-D E-CSAR imaging of a T-72 tank and synthesis of its SAR reconstructions , 2003 .

[2]  Ka-Ma Huang,et al.  MICROWAVE IMAGING A BURIED OBJECT BY THE GA AND USING THE S11 PARAMETER , 2008 .

[3]  Dale A. Ausherman,et al.  Developments in Radar Imaging , 1984, IEEE Transactions on Aerospace and Electronic Systems.

[4]  Ward Cheney,et al.  A course in approximation theory , 1999 .

[5]  Yanping Wang,et al.  A Three-Dimensional Range Migration Algorithm for Downward-Looking 3D-SAR with Single-Transmitting and Multiple-Receiving Linear Array Antennas , 2010, EURASIP J. Adv. Signal Process..

[6]  Yang Jianyu,et al.  Experiment results on “one-active” LASAR , 2009, 2009 IEEE Radar Conference.

[7]  Poi Ngee Tan,et al.  A New Unmanned Aerial Vehicle Synthetic Aperture Radar for Environmental Monitoring , 2012 .

[8]  Y. Qin,et al.  A THREE-DIMENSIONAL IMAGING ALGORITHM FOR TOMOGRAPHY SAR BASED ON IMPROVED INTERPOLATED ARRAY TRANSFORM , 2011 .

[9]  Hiroyoshi Yamada,et al.  Four-component scattering model for polarimetric SAR image decomposition , 2005, IEEE Transactions on Geoscience and Remote Sensing.

[10]  Zhang Xiaoling,et al.  Downward-Looking 3-D linear array SAR imaging based on Chirp Scaling algorithm , 2009, 2009 2nd Asian-Pacific Conference on Synthetic Aperture Radar.

[11]  Xiaozhen Ren,et al.  A Three-Dimensional Imaging Algorithm for Tomography SAR Based on Improved Interpolated Array Transform1 , 2011 .

[12]  Giorgio Franceschetti,et al.  A canonical problem in electromagnetic backscattering from buildings , 2002, IEEE Trans. Geosci. Remote. Sens..

[13]  Thomas Hall,et al.  Near-field three-dimensional radar imaging techniques and applications. , 2010, Applied optics.

[14]  Yunhua Zhang,et al.  CSAR imaging with data extrapolation and approximate GLRT techniques , 2011 .

[15]  Hong Tat Ewe,et al.  MULTIFRACTAL DIMENSION AND ITS GEOMETRICAL TERRAIN PROPERTIES FOR CLASSIFICATION OF MULTI-BAND MULTI-POLARIZED SAR IMAGE , 2010 .

[16]  Akira Ishimaru,et al.  Experimental studies on circular SAR imaging in clutter using angular correlation function technique , 1999, IEEE Trans. Geosci. Remote. Sens..

[17]  Chen Li,et al.  A Residue-Pairing Algorithm for InSAR Phase Unwrapping , 2009 .

[18]  Stephen L. Durden,et al.  A three-component scattering model for polarimetric SAR data , 1998, IEEE Trans. Geosci. Remote. Sens..

[19]  Jens Klare.  Digital Beamforming for a 3D MIMO SAR - Improvements through Frequency and Waveform Diversity , 2008, IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium.

[20]  Jianyu Yang,et al.  Surface-Tracing-Based LASAR 3-D Imaging Method via Multiresolution Approximation , 2008, IEEE Transactions on Geoscience and Remote Sensing.

[21]  Yanping Wang,et al.  Effect of linear array elements spacing on angle imaging performance of downward-looking 3D-SAR , 2009, 2009 IEEE International Geoscience and Remote Sensing Symposium.

[22]  Xiaoling Zhang,et al.  Linear Array SAR Imaging via Compressed Sensing , 2011 .

[23]  Jin Au Kong,et al.  Progress in Electromagnetics Research , 1989 .

[24]  Takashi Takenaka,et al.  A Breast Imaging Model Using Microwaves and a Time Domain Three Dimensional Reconstruction Method , 2009 .

[25]  Jianyu Yang,et al.  APC Trajectory Design for "One-Active" Linear-Array Three-Dimensional Imaging SAR , 2010, IEEE Trans. Geosci. Remote. Sens..

[26]  Sune R. J. Axelsson,et al.  Beam characteristics of three-dimensional SAR in curved or random paths , 2004, IEEE Transactions on Geoscience and Remote Sensing.

[27]  B. Mahafza,et al.  Three-dimensional SAR imaging using linear array in transverse motion , 1996, IEEE Transactions on Aerospace and Electronic Systems.

[28]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .