A Novel Imaging Method for Inverse Scattering Problem Using Stepped-frequency Waveforms
Previously,many algorithms have been used to reconstruct an unknown object from backward scattering data.For the object on a turntable in microwave chamber,inverse synthetic aperture radar(ISAR)method is often used to acquire the image of the object.In this paper,circular synthetic aperture radar(CSAR)algorithm is applied to inverse scattering problem of the object.It can utilize the scattering sampled data of a 360 degree rotation of the objects on the turntable system.Compared to traditional ISAR method,CSAR algorithm can provide the reflective image of the target with high resolution.First,it transforms the scattering field to spatial frequency domain,and compensates the difference in height between the plane of antenna and the turntable.Then,circular spectrum theory is used to obtain the spatial frequency domain of the objects.After FFT transformation,the reflective image of the objects,which is also the spatial domain of the objects,is reconstructed.The point spread function(PSF)is given for the objects in the middle of turntable system.Finally,the simulations for the model of a plane are done both by CSAR algorithm and ISAR method.The results show that the method in this paper has high resolution.Then,an experiment with a metal plate on the turntable is done in microwave chamber at X band.The result shows the algorithm in this paper has high accuracy using stepped-frequency waveforms.
Wei Yan Nai-Zhi Wang Amna Ajaz Jia-Dong Xu
School of Electronic and Information,Northwestern Ploytechnical University,Xian,Shaanxi,China
国际会议
Progress in Electromagnetics Research Symposium 2011(2011年电磁学研究新进展学术研讨会)
苏州
英文
151-154
2011-09-01（万方平台首次上网日期，不代表论文的发表时间）