Dual-speed SAR imaging of moving targets

In conventional synthetic aperture radar (SAR) systems, the image of a moving target is usually mislocated. This is because the Doppler shift of the moving target is determined not only by its geometric location but also by its velocity. After range compression and auto-focusing, the Doppler frequency of the moving target is still time varying and the Doppler centroid is shifted. As a result, the SAR image of a moving target is smeared and the image location of the target may not reflect its true geometric location. In this paper, a dual-speed SAR imaging approach, i.e., the radar platform flies with two different speeds in the radar observation time duration, is proposed to resolve the above two problems, especially mislocation of a moving target.

[1]  Sergio Barbarossa,et al.  Detection and imaging of moving objects with synthetic aperture radar. Part 2: Joint time-frequency analysis by Wigner-Ville distribution , 1992 .

[2]  B. Friedlander,et al.  VSAR: a high resolution radar system for detection of moving targets , 1997 .

[3]  P. Marques,et al.  MOVING TARGETS VELOCITY ESTIMATION USING ALIASED SAR RAW-DATA FROM A SINGLE SENSOR 1 , 2002 .

[4]  Alexander Toet,et al.  Image dataset for testing search and detection models , 2001 .

[5]  A. Currie,et al.  Synthetic aperture radar (SAR) images of moving targets , 1987 .

[6]  M. Soumekh.  Fourier Array Imaging , 1994 .

[7]  John C. Wood,et al.  Linear signal synthesis using the Radon-Wigner transform , 1994, IEEE Trans. Signal Process..

[8]  José M. Bioucas-Dias,et al.  Imaging of fast moving targets using undersampled SAR raw-data , 2001, Proceedings 2001 International Conference on Image Processing (Cat. No.01CH37205).

[9]  R. P. Perry,et al.  SAR imaging of moving targets , 1999 .

[10]  Mehrdad Soumekh,et al.  SAR moving target detection and identification using stochastic gradient techniques , 1995, 1995 International Conference on Acoustics, Speech, and Signal Processing.

[11]  Genyuan Wang,et al.  Inverse synthetic aperture radar imaging of nonuniformly rotating targets , 1996 .

[12]  J.M.B. Dias,et al.  Velocity estimation of fast moving targets using undersampled SAR raw-data , 2001, IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217).

[13]  Pierfrancesco Lombardo.  Estimation of target motion parameters from dual-channel SAR echoes via time-frequency analysis , 1997, Proceedings of the 1997 IEEE National Radar Conference.

[14]  Charles V. Jakowatz,et al.  Refocus of constant-velocity moving targets in synthetic aperture radar imagery , 1998, Defense, Security, and Sensing.

[15]  Sergio Barbarossa.  New autofocusing technique for SAR images based on the Wigner-ville distribution , 1990 .

[16]  J.M.B. Dias,et al.  Multiple moving target detection and trajectory estimation using a single SAR sensor , 2003 .

[17]  Anna Scaglione,et al.  Autofocusing of SAR images based on the product high-order ambiguity function , 1998 .

[18]  Mehrdad Soumekh,et al.  Reconnaissance with ultra wideband UHF synthetic aperture radar , 1995, IEEE Signal Process. Mag..

[19]  Victor C. Chen.  Time-frequency analysis of SAR images with ground moving targets , 1998, Defense, Security, and Sensing.

[20]  Xiang-Gen Xia,et al.  Radar imaging of moving targets in foliage using multifrequency multiaperture polarimetric SAR , 2003, IEEE Trans. Geosci. Remote. Sens..

[21]  S. Qian,et al.  Joint time-frequency analysis , 1999, IEEE Signal Process. Mag..