Interpolation Free Wide Nonlinear Chirp Scaling Algorithm for Spaceborne Stripmap Range Sweep SAR Imaging

The spaceborne stripmap range sweep synthetic aperture radar (SAR) (SS-RSSAR) is a new-concept SAR mode proposed to efficiently image regions of interest (ROI) squinted with respect to satellite orbit. The most distinct feature of the SS-RSSAR is the beam sweeping in the elevation for continuous squ...

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Veröffentlicht in:IEEE geoscience and remote sensing letters Jg. 17; H. 4; S. 621 - 625
Hauptverfasser: Wang, Yan, Ding, Zegang, Zeng, Tao, Long, Teng
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Piscataway IEEE 01.04.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithms
Azimuth
Chirp
Computer simulation
Doppler effect
Doppler sonar
Efficiency improvement
Imaging
Imaging techniques
Interpolation
interpolation free wide nonlinear chirp scaling algorithm (IF-WNLCSA)
SAR (radar)
Satellite orbits
Scaling
spaceborne stripmap range sweep SAR imaging
Synthetic aperture radar
Time-domain analysis
ISSN:1545-598X, 1558-0571
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Zusammenfassung:The spaceborne stripmap range sweep synthetic aperture radar (SAR) (SS-RSSAR) is a new-concept SAR mode proposed to efficiently image regions of interest (ROI) squinted with respect to satellite orbit. The most distinct feature of the SS-RSSAR is the beam sweeping in the elevation for continuous squinted ROI illumination. A wide nonlinear chirp scaling algorithm (WNLCSA) has been proposed to directly implement image formation along the ROI spreading direction. However, the algorithm efficiency is limited due to its time-consuming time-domain interpolation. In this letter, a new interpolation free WNLCSA (IF-WNLCSA) is proposed for more efficient SS-RSSAR imaging by substituting the interpolation with a much faster chirp scaling approach. Different from the interpolation, the chirp scaling induces additional range migration and Doppler modulation, both of which, however, are neglected due to their weak influences on imaging. The derivation of the chirp scaling is presented in detail, followed by the analyses on the algorithm accuracy and efficiency. The presented approach is evaluated by both the point- and extended-target simulations.
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ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2019.2930537