An analysis of time-frequency methods in SAR imaging of moving targets

被引:17
作者
Ding, Y [1 ]
Xue, N [1 ]
Munson, DC [1 ]
机构
[1] Univ Illinois, Coordinated Sci Lab, Urbana, IL 61801 USA
来源
SAM 2000: PROCEEDINGS OF THE 2000 IEEE SENSOR ARRAY AND MULTICHANNEL SIGNAL PROCESSING WORKSHOP | 2000年
关键词
D O I
10.1109/SAM.2000.878002
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Imaging of moving targets using synthetic aperture radar (SAR) is a challenging task. Target motion in the range direction causes a cross-range shift of the target in the reconstructed image. :Target motion in the cross-range direction causes blurring in the reconstructed image. In recent years, a number of researchers have applied time-frequency (T-F) techniques, based on the Wigner-Ville distribution, to SAR imaging of moving targets. Specifically, a series of Wigner-Ville or other T-F transforms is substituted for the series of cross-range FFTs in the customary SAR image formation algorithm. The result is a series of SAR images (instead of just one image), indexed as a function of cross-range, in which the blurring of the target due to cross-range motion is largely eliminated. The cross-range shift due to range motion remains, but can be estimated: In this paper, we analyze the T-F approach by deriving an approximate closed-form expression for the point-target response of the SAR imaging system, assuming a point target moving with constant velocity and T-F processing using the Wigner-Ville distribution. We then use the point-target response to assess the blur reduction and resolving capabilities of the T-F approach. Simulation results for point targets are presented to validate the derived expression.
引用
收藏
页码:221 / 225
页数:5
相关论文
共 4 条
[1]   SPACE-TIME-FREQUENCY PROCESSING OF SYNTHETIC-APERTURE RADAR SIGNALS [J].
BARBAROSSA, S ;
FARINA, A .
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS, 1994, 30 (02) :341-358
[2]  
BARBAROSSA S, 1990, P IEEE INT RAD C, P44
[3]   TIME FREQUENCY-DISTRIBUTIONS - A REVIEW [J].
COHEN, L .
PROCEEDINGS OF THE IEEE, 1989, 77 (07) :941-981
[4]   A TOMOGRAPHIC FORMULATION OF SPOTLIGHT-MODE SYNTHETIC APERTURE RADAR [J].
MUNSON, DC ;
OBRIEN, JD ;
JENKINS, WK .
PROCEEDINGS OF THE IEEE, 1983, 71 (08) :917-925