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A Modified CSA Based on Joint Time-Doppler Resampling for MEO SAR Stripmap Mode.
- Source :
-
IEEE Transactions on Geoscience & Remote Sensing . Jun2018, Vol. 56 Issue 6, p3573-3586. 14p. - Publication Year :
- 2018
-
Abstract
- Image formation of large scenes is still challenging in medium-earth-orbit (MEO) synthetic aperture radar (SAR) due to the existence of severe 2-D space variance. In this paper, the properties of space variance are analyzed in detail, and then a variable-coefficient fourth-order range model is adopted to model the space-variant range history of every target in a large scene accurately. A method integrating a modified chirp scaling algorithm with joint time-Doppler resampling is proposed to address the range-variant range cell migration, as well as the azimuth-variant frequency-modulation rate and higher order Doppler parameters. The computational burden and alternative implementation approaches are also discussed. Finally, processing of simulated data for MEO SAR with 2-m resolution is presented to validate the proposed algorithm. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01962892
- Volume :
- 56
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Geoscience & Remote Sensing
- Publication Type :
- Academic Journal
- Accession number :
- 129949350
- Full Text :
- https://doi.org/10.1109/TGRS.2018.2802545