Three dimensional(3-D)imaging algorithms with irregular planar multiple-input-multiple-output(MIMO)arrays are discussed and compared with each other.Based on the same MIMO array,a modified back projection algorithm(MB...Three dimensional(3-D)imaging algorithms with irregular planar multiple-input-multiple-output(MIMO)arrays are discussed and compared with each other.Based on the same MIMO array,a modified back projection algorithm(MBPA)is accordingly proposed and four imaging algorithms are used for comparison,back-projection method(BP),back-projection one in time domain(BP-TD),modified back-projection one and fast Fourier transform(FFT)-based MIMO range migration algorithm(FFT-based MIMO RMA).All of the algorithms have been implemented in practical application scenarios by use of the proposed imaging system.Back to the practical applications,MIMO array-based imaging system with wide-bandwidth properties provides an efficient tool to detect objects hidden behind a wall.An MIMO imaging radar system,composed of a vector network analyzer(VNA),a set of switches,and an array of Vivaldi antennas,have been designed,fabricated,and tested.Then,these algorithms have been applied to measured data collected in different scenarios constituted by five metallic spheres in the absence and in the presence of a wall between the antennas and the targets in simulation and pliers in free space for experimental test.Finally,the focusing properties and time consumption of the above algorithms are compared.展开更多
Based on the general geometric model of multi-baseline Synthetic Aperture Radar Tomography(TomoSAR),the three-dimensional(3-D)sampling criteria,the analytic expression of the 3-D Point Spread Function(PSF)and the 3-D ...Based on the general geometric model of multi-baseline Synthetic Aperture Radar Tomography(TomoSAR),the three-dimensional(3-D)sampling criteria,the analytic expression of the 3-D Point Spread Function(PSF)and the 3-D resolution are derived in the 3-D wavenumber domain in this paper.Considering the relationship between the observation geometry and the size of illuminated scenario,a 3-D Range Migration Algorithm with Elevation Digital Spotlighting(RMA-EDS)is proposed.With this algorithm 3-D images of the area of interest can be directly and accurately reconstructed in the 3-D space avoiding the complex operations of 3-D geometric correction.Finally,theoretical analyses and simulation results are presented to demonstrate the shift-varying property of the 3-D PSF and the spatialvarying property of the 3-D resolution and to demonstrate the validity of the 3-D RMA-EDS.展开更多
基金National Natural Science Foundation of China(No.62293493)。
文摘Three dimensional(3-D)imaging algorithms with irregular planar multiple-input-multiple-output(MIMO)arrays are discussed and compared with each other.Based on the same MIMO array,a modified back projection algorithm(MBPA)is accordingly proposed and four imaging algorithms are used for comparison,back-projection method(BP),back-projection one in time domain(BP-TD),modified back-projection one and fast Fourier transform(FFT)-based MIMO range migration algorithm(FFT-based MIMO RMA).All of the algorithms have been implemented in practical application scenarios by use of the proposed imaging system.Back to the practical applications,MIMO array-based imaging system with wide-bandwidth properties provides an efficient tool to detect objects hidden behind a wall.An MIMO imaging radar system,composed of a vector network analyzer(VNA),a set of switches,and an array of Vivaldi antennas,have been designed,fabricated,and tested.Then,these algorithms have been applied to measured data collected in different scenarios constituted by five metallic spheres in the absence and in the presence of a wall between the antennas and the targets in simulation and pliers in free space for experimental test.Finally,the focusing properties and time consumption of the above algorithms are compared.
基金Supported by the National Science Fund for Distinguished Young Scholars(Grant No.60725103)the National Natural Science Foundation ofChina(Grant No.60602015)+1 种基金the National Key Laboratory Foundation(Grant No.9140C1903030603)the Knowledge Innovation Programof Chinese Academy of Sciences(Grant No.07QNCX-1154)
文摘Based on the general geometric model of multi-baseline Synthetic Aperture Radar Tomography(TomoSAR),the three-dimensional(3-D)sampling criteria,the analytic expression of the 3-D Point Spread Function(PSF)and the 3-D resolution are derived in the 3-D wavenumber domain in this paper.Considering the relationship between the observation geometry and the size of illuminated scenario,a 3-D Range Migration Algorithm with Elevation Digital Spotlighting(RMA-EDS)is proposed.With this algorithm 3-D images of the area of interest can be directly and accurately reconstructed in the 3-D space avoiding the complex operations of 3-D geometric correction.Finally,theoretical analyses and simulation results are presented to demonstrate the shift-varying property of the 3-D PSF and the spatialvarying property of the 3-D resolution and to demonstrate the validity of the 3-D RMA-EDS.
