Fast 3D-ISAR Image Simulation of Targets at Arbitrary Aspect Angles Through Nonuniform Fast Fourier Transform (NUFFT)

被引：22
|
作者：
He, Xin Yi [1 ,2 ]
Zhou, Xiao Yang [1 ,2 ]
Cui, Tie Jun [1 ,2 ]
机构：
[1] Southeast Univ, Inst Target Characterist & Identificat, Nanjing 210096, Jiangsu, Peoples R China
[2] Southeast Univ, State Key Lab Millimeter Waves, Sch Informat Sci & Engn, Nanjing 210096, Jiangsu, Peoples R China
来源：
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2012年 / 60卷 / 05期
基金：
美国国家科学基金会;
关键词：
Electromagnetic modeling and simulation; electromagnetic scattering; inverse synthetic aperture radar image; shooting and bouncing rays; 3D nonuniform fast Fourier transform; RAY-TUBE INTEGRATION; RADAR; ALGORITHM;
D O I：
10.1109/TAP.2012.2189717
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We present a method to generate three-dimensional (3D) inverse synthetic aperture radar (ISAR) images of a target at arbitrary aspect angles using the shooting and bouncing ray (SBR) method. We have derived a 3D-image-domain ray-tube integration formula based on the SBR technique. The imaging formula is in a form of convolution, then a nonuniform fast Fourier transform (NUFFT) is induced to achieve the convolution, which can be used to generate 3D ISAR images rapidly. Compared to the conventional algorithm where the ISAR images are obtained by inverse Fourier transforming the computed scattered fields over a range of frequencies and a range of aspect angles, the new formula needs only one-time ray tracing and physical optics (PO) integration over a small angle span. Hence the computational time is decreased tremendously. The ISAR images of a missile target and an armored car for several aspect angles are presented to demonstrate the efficiency and accuracy of the proposed method.
引用
收藏
页码：2597 / 2602
页数：6
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